REPAIRING / SERVICING TV AKAI LES-50V46M

Technical description and composition of the TV AKAI LES-50V46M, type of panel and modules used. Module composition.
Composition Specifications
AKAI LES-50V46M
Smart TV LES-50V46M | Year of manufacture: 2015
Screen diagonal: 50" (127 cm)
Aspect ratio: 16:9
Resolution: 1920x1080
Frequency refresh rate:     50 Hz
LCD panel type: T500HVN08.8
LED backlight: Yes
Smart: Yes. Wi-Fi support: yes
Operating system: Android
Support HD: 1080p Full HD
Progressive scan: Yes
TV standards: PAL, SECAM, NTSC
Digital tuner: DVB-T, DVB-T2, DVB-C
Teletext: Yes
DTV formats: 480i, 480p, 576i, 576p, 720p, 1080i
Multimedia: MP3, WMA, MPEG4, DivX, MKV, JPEG
Stereo sound: there is
Sound Power: 16W (2x8W)
Acoustics: two speakers
Interface: Component, SCART, VGA, HDMI x2, USB x2, Ethernet (RJ-45), Wi-Fi 802.11n
Headphone jack: yes
TV weight: 13.6 kg
Dimensions: With stand 1132x705x235 mm
Without stand 1132x665x83mm.

AKAI LED Model: LES-50V46M

Chassis/Version: TP.MS3463S.PC821

Panel: T500HVN08.8 (AUO)

LED backlight: AS358M

LED driver (backlight): integrated into MainBoard

PWM LED driver: PWM SOT23-6, AS358

MOSFET LED driver: N-FET TO-220F

Power Supply (PSU): integrated into MainBoard

PWM Power: PFC, PWM

MOSFET Power: TO-220, TO252

MainBoard: TP.MS3463S.PC821

IC MainBoard: CPU: MSD3463GSA-U6, SPI Flash: 25Q64CSIG, Audio: TPA3110LD2

TP: NoName
General advice about LCD LED TV repair
Possible problems

- AKAI LES-50V46M does not turn on, the indicators on the front panel are not lit or flashing. The TV does not respond to the control buttons and remote control.

In this case the main power supply can be defective - AC/DC converter, elements of which in this model are located on the common MainBoard TP.MS3463S.PC821. It is necessary to measure its output voltages and if there are no such voltages check the power switches (TO-220, TO252) and the rectifier diodes for possible short circuits in the converters.
When diodes breakdown in the secondary circuits, the inverter can operate in the emergency short-circuit mode without output voltages, and when the power elements of the primary circuit are shorted, the mains fuse and/or the current sensor at the source of the key usually break down.
Breakdown of Mos-Fet switches used in pulse power supplies is often caused by faults in other elements, e.g. in the PWM power supply circuit, in the frequency-retaining or damping circuits, and in the Negative Feedback Stabilization circuit. PWM PFC, PWM chips are usually checked by replacing them with new ones or with ones known to be in good working order.

- No picture, but there is sound and remote control responds. Or the image appears at power on and immediately disappears.

Failure in most of these cases is detected in the nodes and elements of LED panel backlight. The cause may be found in the failure of the LEDs, in violation of the AS358M LED strips contact connections, or in providing them with power (LED-driver).
It is impossible to detect a breakage in the line of LEDs without disassembling the panel with a simple multimeter. LEDs are connected in series and in order to open their junctions you will need several dozens of volts. Ideally a current source would be suitable for this purpose. You can open up the panel and check each LED separately. Usually, Chinese multimeters will light up one 3 volt LED slightly if you connect the probes to it in the forward direction (red probe to the anode, black probe to the cathode). For twin 6-volt LEDs, the PN junction of its faulty regulator can be an indicator of the health of the LED. If the LED is faulty, it will either be open or shorted.

If the AKAI LES-50V46M has no picture but has sound, often the T500HVN08.8 display backlight simply does not work. Moreover, in LED TVs the LEDs inside the panel usually fail, less often the LED-driver.
In such cases, you can see a barely noticeable image when external light hits the screen.

To replace the LEDs requires disassembly of the LCD-panel T500HVN08.8 - the process requiring a master of experience and skill. We do not recommend to perform such works by yourself to owners of TV sets and craftsmen who have no experience in LCD panel repair.

READ HOW TO REPAIR THE TV LED BACKLIGHT --------------> HERE.


If there is no image, but backlighting works - the screen becomes a little lighter when you turn on the TV, and in the open TV you can see the light through the holes in the body of the panel.

In this case the panel may be defective - damage to the strips, cables, for example, as a consequence of moisture after an unsuccessful washing of the screen, the T-CON board (Timing Controller) may be defective. But quite often the MainBoard TP.MS3463S.PC821 is also defective, so software defects are also possible.
Then first it is necessary to check the panel power supply voltage, the fuses on the T-CON board, as well as the supply and reference voltages of the column and line drivers - VGH, VGL, Vcom.

If these measurements are within normal limits, you need to trace by oscilloscope the LVDS signals from MainBoard TP.MS3463S.PC821, as well as synchronizing signals to driver stubs.


Filled or unsuccessfully washed LED TV screens can be restored in about half of the cases, usually if there is no significant damage to the panel stubs and slats.


- The TV set does not enter the operating mode, the remote control is unresponsive. Front panel LED is either constantly on or is blinking.

Repair or diagnostic of the TP.MS3463S.PC821 motherboard should begin with checking the stabilizers and power converters necessary to power the microcircuits and the matrix. If necessary, update or replace the software (firmware). When repairing MB board, you must check its components CPU: MSD3463GSA-U6, SPI Flash: 25Q64CSIG, Audio: TPA3110LD2. Defective elements should be replaced. If chips with BGA soldering technology are used, the problem in its implementation is detected by the method of local heating of the chip.

If the TV set works normally from external devices, but does not tune to the TV channels, there may be a problem with the NoName tuner. In these cases you should first make sure that there is a supply voltage on the corresponding pins of the tuner. Also, make sure that the tuner and the processor are communicating via the I2C bus. Sometimes a software malfunction can be the reason for the tuner not working.

Once again, please remind TV users not to try to repair it yourself, without the appropriate knowledge, experience, and necessary qualification! Trust repairs to professionals with sufficient experience in the field of electronic repair.

DOWNLOAD SCHEMATIC DIAGRAM  / PSU  SERVICE MANUAL   ------------------>   TP.MS3463S.PC821 Power supply.

 

Refinement after the repair of the backlight. TP.MS3463S.PC821. Information from the master.

Decreased backlight current from 290 mA to 220 mA - removed one of the 1.6 Ohm resistors in the driver current sensor on the TP.MS3463S.PC821 board.
The current sensor is an assembly of 1.6, 2.2 Ohm resistors in the LED driver node next to GD3 and EB301.
Driver current limitation. TP.MS3463S.PC821. General Information.

To reduce the backlight current, you can remove one of the resistors in the driver current sensor on the TP.MS3463S.PC821 board.
The current sensor is an assembly of six 1.6-2.2 Ohm resistors, located next to GD3 and EB301 in the LED driver assembly.
TP.MS3463S.PC821 current backlight.

  Ways to limit the current in LED backlight drivers:

There is a lot of information on the Internet about ways to limit the current in the LED backlighting for different TVs and LED drivers. A lot of it is written plausibly but sometimes it is written by people far from electronics in order to publish any popular content on hot topics to boost web-sites ratings.

It's impossible to talk about each case separately within one article, because even similar models may have different panels and different boards with their own driver variants. But there are basic principles that are clear to craftsmen with even minimal knowledge and skill.

Other popular, complex and controversial current limit cases will be published as information becomes available.
There are three basic ways to reduce the backlight current.

1. By increasing the resistance of the LED current sensor - a low-resistance measuring resistor in the cathode (LED-) circuit.
2. Increasing the ratings of the resistors on the ISET (current setting) input of the LED driver chip.
3. changing the resistor ratings in the divider on the ADIM (Dimming) control input.

The fundamental difference between input ISET and ADIM is that ISET - input inverted, as FB, and ADIM - direct.

More on MainBoard Repair

The appearance of the MainBoard TP.MS3463S.PC821 is shown in the figure below:

TP.MS3463S.PC821

The main features of the device AKAI LES-50V46M:

A T500HVN08.8 (AUO) matrix (LED panel) is installed.
To power the LED backlight using a converter, combined with the main board TP.MS3463S.PC821, is controlled by a PWM SOT23-6, AS358. N-FET TO-220F switches are used as power elements of LED driver.
The power module is combined with MainBoard and is designed as reverse-going AC/DC converter with PFC, PWM chips and TO-220, TO252 type power switches.
MainBoard - the main board (motherboard) is a module TP.MS3463S.PC821, with the use of chip CPU: MSD3463GSA-U6, SPI Flash: 25Q64CSIG, Audio: TPA3110LD2 and others.
The NoName tuner allows you to receive TV programs and tune to channels.

TV AKAI LES-50V46M with LCD T500HVN08.8 diagonal 50 "(127 cm) format 16:9. In the manufacturing technology of the display model is implemented LED backlighting.
LCD panel T500HVN08.8 and software of MainBoard TP.MS3463S.PC821 provide for the realization of images in high quality HD with 1920x1080 pixels resolution in 1080p (Full HD) graphic decomposition.
Model LES-50V46M TV has built-in SMART software and pre-installed the Android operating system. Connection to the network can be made via Wi-Fi wireless connection. Input antenna or video signal can be processed in PAL, SECAM, NTSC analog systems. Graphical processing and formation of a digital signal takes place in the standards 480i, 480p, 576p, 576p, 720p, 1080i. Supported media file formats: MP3, WMA, MPEG4, DivX, MKV, JPEG.
The sound system has a capacity of 16 W (2x8 W), provided by two speakers. NICAM STEREO audio processing system is used.

External interface (connection to other devices) is supported by standard inputs and outputs: antenna input (RF), component, SCART, VGA, HDMI x2, USB x2, Ethernet (RJ-45), Wi-Fi 802.11n. There is a headphone output. To connect a computer or laptop to this TV model uses a VGA (D-Sub 15) connector on the TV body, this interface supports resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768, 1920x1080. The digital tuner can receive TV channels in the standards DVB-T, DVB-T2, DVB-C.
The TV set has a power supply as part of the MainBoard.

Overall dimensions: With stand 1132x705x235 mm, without stand 1132x665x83 mm.
TV weight 13.6 kg.

Warning. The panel T500HVN08.8 LED-TV AKAI LES-50V46M is expensive and unreliable element of the TV.
Do not allow any impacts on the glass and pressure on the screen surface to avoid damage to the LED panel!
Also it is not safe to get liquid on the screen. Sometimes one drop is enough if it drips down the glass onto the cables and the TV becomes unrepairable.

REPAIRING / SERVICING TV TELEFUNKEN D32H277N3C

 Technical description and composition of the TELEFUNKEN D32H277N3C TV, type of panel and modules used. Module composition.
Composition Specifications
TELEFUNKEN D32H277N3C
TELEFUNKEN D32H277N3C

TELEFUNKEN LED Model: D32H277N3C

Chassis/Version: 17MB95M

Panel: VES315WNDB-2D-N02

T-CON: FAN6300

LED driver (backlight): integrated into PSU

PWM LED driver: MP3394S

MOSFET LED driver: FQD7N10L

Power Supply (PSU): 17IPS71

MOSFET Power: FQPF8N60C

MainBoard: 17MB95M

IC MainBoard: MT5820LUNU, 25L1605, H27U2G8F2CTR-BC, H5TQ2G63DFR
General advice about LCD LED TV repair
Possible defects

- TELEFUNKEN D32H277N3C doesn't turn on, buttons and remote control don't respond, indicators on the front panel don't glow or blink.

Usually with such manifestations the defect is caused by faulty elements in the main power module 17IPS71. Then you should measure its output voltages, and in case of their full or partial absence you should check the serviceability of the power switches (FQPF8N60C) and the inverter rectifier diodes for possible short circuits.
If there is a breakdown in the secondary circuits, the inverter can usually be short-circuited, and a short in the power elements of the primary circuit will usually blow the mains fuse.
Mos-Fet power switches used in switching power supplies sometimes fail due to the failure of any other elements that can take it out of key mode, or create an exceedance of the maximum allowable parameters of the switch. These can be the elements that feed the PWM controller, the frequency-retaining or damping circuits, or the negative feedback elements in the stabilization circuit. PWM controllers, if there is no visible damage or outright short circuits between pins, are checked by replacing with new or known good ones.

- No picture, screen is black, there is sound, with external lighting of the screen you can sometimes see faintly visible outlines of the image.

As a rule, in such cases there is no display backlight. The cause may be in the breakage of backlight LEDs, in the stabilization of their power, or in the violation of the contact connections of the string connectors.
It is impossible to detect a breakage in the line of LEDs without disassembling the panel with a simple multimeter. LEDs are connected in series and to open their junctions you will need a voltage of several tens of volts. Ideally a current source would be suitable for this purpose. You can open up the panel and check each LED separately. Usually, Chinese multimeters will light up one 3 volt LED slightly if you connect the probes to it in the forward direction (red probe to the anode, black probe to the cathode). For twin 6-volt LEDs, the PN junction of its faulty stabilizer can be used as an indicator of the health of the LED. If the LED is faulty, it will either be open or shorted.

READ HOW TO REPAIR THE TV LED BACKLIGHT --------------> HERE.

- The TV set will not turn on, the LED will indicate standby or operation mode, or it will blink.

Repair or diagnosis of the 17MB95M motherboard should begin with checking the stabilizers and power converters needed to power the chips and matrix. If necessary, software (software) should be updated or replaced. Sometimes the following MainBoard parts need to be checked or replaced (if necessary): MT5820LUNU, 25L1605 , H27U2G8F2CTR-BC, H5TQ2G63DFR. If you use a BGA processor, its malfunction is usually diagnosed by local heating.

Warning to users! Unauthorized repair of TELEFUNKEN D32H277N3C without relevant qualification and necessary experience may lead to its total unrepairability!


DOWNLOAD SCHEMATIC DIAGRAM  / PSU SERVICE MANUAL   ------------------>    17IPS71-R3 Power supply.

DOWNLOAD FIRMWARE FOR SPI FLASH  ----------->   TELEFUNKEN D32H277N3C, Main: 17MB95M, Panel: VES315WNDB-2D-N02.

Refinement after repair of the backlight. 17IPS71, MP3394S. Information from the master.

Decreased backlight current from 240 mA to 160 mA - I replaced R113 resistor 2.7 kOhm to 6.2 kOhm on pin 6 of MP3394S LED driver on 17IPS71 power supply board.
Driver current limitation. 17IPS71, MP3394S. General advice.

To reduce backlight current in TV's with 17IPS71 power supply and MP3394S LED driver chip, increase the total resistance of the resistors from pin 6 (ISET) to the cabinet. It is sufficient to increase the rating of one of them, for example R113.
The maximum current in each channel (in milliamps) for resistor Rset (in kiloohms) will be determined from the ratio 790*1.23V/(Rset+0.4).
17IPS71 current backlight

A PDF document from the manufacturer of the ---------------->  MP3394S     is included.
 

More on MainBoard Repair

The MainBoard 17MB95M is shown in the illustration below:

17MB95M

17MB95M can be used in televisions:

TOSHIBA 40L5455R (Panel VES400UNVS-3D-N01), TOSHIBA 40L5435 40L5435DG (Panel VES400UNVS-3D-N01).

Power Supply Unit Appearance

The main features of the device TELEFUNKEN D32H277N3C:

A matrix (LED panel) VES315WNDB-2D-N02 is installed.
Timing Controller (T-CON) FAN6300 is used to control the matrix.
The converter combined with a power supply is used to power the backlight LEDs and is controlled by the MP3394S PWM controller. FQD7N10L switches are used as power elements of LED-driver.
The required supply voltages for all TELEFUNKEN D32H277N3C TV assemblies are generated by the 17IPS71 power supply module or its analogues with the use of FQPF8N60C power keys.
MainBoard - the main board (motherboard) is 17MB95M module, using MT5820LUNU, 25L1605, H27U2G8F2CTR-BC, H5TQ2G63DFR and other microchips.

 

REPAIRING / SERVICING TV TELEFUNKEN TF-LED32S54T2

Technical description and composition of the TELEFUNKEN TF-LED32S54T2 TV, type of panel and modules used. Module composition.
Composition Specifications
TELEFUNKEN TF-LED32S54T2
LCD TV LED TF-LED32S54T2 | Year of manufacture: 2017
Screen diagonal: 31.5" (80 cm)
Screen Format: 16:9
Resolution: 1366x768
LCD panel type: V320BJ6-Q01
LED backlight: Yes
Support HD: 720p HD
Brightness: 250 cd/m2
Contrast: 1200:1
Viewing Angle: 178°
Pixel response time: 8 msec
Progressive scan: Yes
Digital tuner: DVB-T, DVB-T2, DVB-C
Number of channels: 799
Teletext: there is
Multimedia: MP3, MPEG4, Xvid, MKV, JPEG
Sound stereo: there is
Sound power: 12W (2x6W)
Acoustics: two speakers
Interface: component, VGA, HDMI x3, USB x2
Headphone jack: yes
TV weight:     Without stand: 4.2 kg


TELEFUNKEN LED Model: TF-LED32S54T2

Chassis/Version: CV3463H-Q42

Panel: V320BJ6-Q01

LED driver (backlight): integrated into MainBoard

PWM LED driver: SO-8

MOSFET LED driver: TO-252

Power Supply (PSU): integrated into MainBoard

PWM Power: PWM SOT23-6

MOSFET Power: TO-252

MainBoard: CV3463H-Q42

IC MainBoard: SPI Flash: 25Q64

Tuner: NoName
General advice about LCD LED TV repair
Possible problems

- TELEFUNKEN TF-LED32S54T2 TV set doesn't turn on at all. No response to remote control or front panel controls. Indicator lights do not turn on or blink.

First of all in such cases you should check the operability of the common switching power supply (CGPS), AC/DC converter of the mains voltage. All elements of the source in this model of TV are located on the MainBoard CV3463H-Q42. It is then necessary to measure its output voltages and, if not, check the power switches (TO-252) and rectifier diodes of the converters for possible short circuits.
If there is a breakdown in the secondary circuits, the inverter may be short-circuited, and if there is a short in the primary circuit elements, the mains fuse usually blows.
Mos-Fet switches used in switching power supplies usually fail due to the failure of other elements that can take it out of key mode, or cause it to exceed the maximum current or voltage. These may be the circuits feeding the PWM controller, the damping or frequency-retaining circuits, or the negative feedback elements in the stabilization circuit. PWM controllers (PWM) PWM SOT23-6, in the absence of external damage and short circuits between the pins, are checked by replacing with known good ones.

- No picture, sound is present, remote control responds. Or the image may appear for a second and then disappear at once.

In some of these cases the failure is caused by the absence of display backlight. More often the cause is a breakage of the LEDs, or poor contact in the connectors of the boards, less often the LED-driver may be faulty.
To check the LED bars for breakage without disassembling the panel, you can, for example, use a power supply. It is not possible to open the series-connected PN-junctions with a simple multimeter, you will need a voltage of about several tens of volts.

- Indicator on the front panel is blinking, the TV set does not turn on in the working mode, the remote control does not react.

Repair or diagnostic of the CV3463H-Q42 motherboard should be started with checking stabilizers and power converters needed to power the chips and matrix. If necessary, software (software) should be updated or replaced. In some cases, to repair the MB board (SSB) you may need to replace the chips - SPI Flash: 25Q64 with new or known good ones. In cases of BGA technology, defects are usually localized by heating method.

If your TV works normally from external devices, but does not tune to the TV channels, the NoName tuner might be faulty. In these cases first of all you should check if there is a supply voltage on the corresponding pins of the tuner. Also, make sure that the tuner and the processor are communicating via the I2C bus. Sometimes a software malfunction can be the reason for the tuner malfunction.

If your TELEFUNKEN TF-LED32S54T2 has no picture but has sound, often the display backlight of the V320BJ6-Q01 simply does not work. Moreover, in LED TVs usually fail the LEDs inside the panel, less often the LED-driver.
In such cases you can see a faintly visible image when external light hits the screen.

To replace the LEDs requires disassembly of the LCD panel V320BJ6-Q01 - the process requiring a master of experience and expertise. We do not recommend to perform such works by yourself to owners of TV sets and masters who have no experience in LCD panel repair.

READ HOW TO REPAIR THE TV LED BACKLIGHT --------------> HERE.


If there is no image, but backlighting works - the screen becomes slightly lighter when the TV is turned on, and in the open TV you can see the light through the holes in the body of the panel.

In this case the panel may be defective - damage to the strips, cables, for example, as a consequence of moisture after an unsuccessful washing of the screen, the T-CON board (Timing Controller) may be defective. But quite often the CV3463H-Q42 MainBoard is faulty as well and so is the software.
Then first it is necessary to check the panel power supply voltage, fuses on the T-CON board, as well as the supply and reference voltages of the column and line drivers - VGH, VGL, Vcom.

If these measurements are within normal limits, you need an oscilloscope to trace the LVDS signals from MainBoard CV3463H-Q42, as well as synchronizing signals to the driver stubs.

Filled or unsuccessfully washed LED TV screens can be restored in about half of the cases, usually, if no significant damage was not formed in the plumes and slats of the panel.

Once again, users must be reminded! Trying to repair your TELEFUNKEN TF-LED32S54T2 without proper skill and experience may result in its total uselessness.

DOWNLOAD FIRMWARE FOR SPI FLASH  ----------->  TELEFUNKEN TF-LED32S54T2, Main: CV3463H-Q42, Panel: V320BJ6-Q01.

 Refinement after repair of the backlight. CV3463H-Q42. Information from the master.

Reduce backlight current from 600 mA to 280 mA - Removed two 1.5 Ohm and 1.0 Ohm resistors in the LED current sensor on the CV3463H-Q42 board.
CV3463H-Q42 current backlight
More on MainBoard Repair

The appearance of the MainBoard CV3463H-Q42 is shown in the figure below:

CV3463H-Q42

Main features of TELEFUNKEN TF-LED32S54T2:

PWM SMPS in SOT-23-6, SOT-26, TSOP-6 packages

In the circuitry of modern switching power supplies (SMPS), PWM controllers made in small-sized planar packages with six terminals have gained wide popularity. The enclosure type designation can be SOT-23-6, SOT-23-6L, SOT-26, TSOP-6, SSOT-6. The appearance and arrangement of the pins are shown in the figure below. In this case, the code marking LD7530A is shown on the left fragment of the picture.


 

 Pin assignment:
1 - GND. (Common wire).
2 - FB. (FeedBack - Feedback). Input for controlling the duration of pulses with a signal from the output voltage. Sometimes it can be labeled COMP (input comparator).
3 - RI / RT / CT / COMP / NC - Depending on the type of microcircuit, it can be used for a frequency-setting RC circuit (RI / RT / CT), or for organizing protection, as an input of a PWM trip comparator at a threshold value at its input, specified in the document. In some types of microcircuits, this input may not be used in any way (NC - No Connect).
4 - SENSE, otherwise CS (Current Sense) - Input from the current sensor at the source of the key.
5 - VCC - Input voltage supply and start of the microcircuit.
6 - OUT (GATE) - Output for controlling the gate (Gate) of the key.

Functionally, these regulators work on the principle of the previously popular xx384x PWM microcircuits, which have proven themselves well in terms of reliability and stability.

Some difficulties often arise when replacing or choosing an analog for such PWM regulators due to the use of code markings in the designation of the type of microcircuits. The situation is complicated by a large number of component manufacturers who do not always provide documentation to the mass access, just as not all manufacturers of finished devices supply repair service centers with diagrams, so repairmen often have to study real circuit solutions by installed components and wiring connections directly on the board.

In practice, PWM microcircuits and the marking code EAxxx and Eaxxx are often found. Official documentation for them was not found in the public domain, but discussions on the forums and pieces of pictures from PDF from System General, which publishes them as SG6848T and SG6848T2, have survived. The drawing is here placed left .


 

For the attention of the masters, here below are PDF datasheet tables compiled from information available on the Internet and PDF documents for the selection of analogues types when replacing the most common six-legged planar PWM with pinout pins: pin1 - GND, pin2 - FB (COMP), pin4 - Sense, pin5 - Vcc, pin6 - OUT ...
Their main difference is the application and purpose of pin 3. 

 

Name	Part Number	Fabricant	Marking
SG6849	SG684965TZ	Fairchild / ON Semi	BBxx
SG6849	SG6849-65T, SG6849-65TZ	System General	MBxx EBxx
SGP400	SGP400TZ	System General	AAKxx

 

 PWM controllers (PWM) with a 95-100 kOhm resistor on pin 3.

When applying the PWM listed below, the frequency should be set with the RT (RI) resistor from pin 3 to ground. Usually its nominal value is chosen 95-100 kOhm for a frequency of 65-100 KHz. For more details, see the here below attached documentation. PDF files are packed in RAR.

 

Name	Part Number	Fabricant	Marking
AP3103A	AP3103AKTR-G1	Diodes Incorporated	GHL
AP8263	AP8263E6R, A8263E6VR	AiT Semiconductor	S1xx
AT3263	AT3263S6	ATC Technology	3263
CR6848	CR6848S	Chip-Rail	848H16
CR6850	CR6850S	Chip-Rail	850xx
CR6851	CR6851S	Chip-Rail	851xx
FAN6602R	FAN6602RM6X	Fairchild / ON Semi	ACCxx
FS6830	FS6830	FirstSemi
GR8830	GR8830CG	Grenergy	30xx
GR8836	GR8836C, GR8836CG	Grenergy	36xx
H6849	H6849NF	HI-SINCERITY
H6850	H6850NF	HI-SINCERITY
HT2263	HT2263MP	HOT-CHIP	63xxx
KP201		Kiwi Instruments
LD5530	LD5530GL LD5530R	Leadtrand	xxt30 xxt30R
LD7531	LD7531GL, LD7531PL	Leadtrend	xxP31
LD7531A	LD7531AGL	Leadtrend	xxP31A
LD7535/A	LD7535BL, LD7535GL, LD7535ABL, LD7535AGL	Leadtrend	xxP35-xxx35A
LD7550	LD7550BL, LD7550IL	Leadtrend	xxP50
LD7550B	LD7550BBL, LD7550BIL	Leadtrend	xxP50B
LD7551	LD7551BL/IL	Leadtrend	xxP51
LD7551C	LD7551CGL	Leadtrend	xxP51C
NX1049	XN1049TP	Xian-Innuovo	49xxx
OB2262	OB2262MP	On-Bright-Electronics	62xx
OB2263	OB2263MP	On-Bright-Electronics	63xx
PT4201	PT4201E23F	Powtech	4201
R7731	R7731GE/PE	Richtek	0Q=
R7731A	R7731AGE	Richtek	IDP=xx
SD4870	SD4870TR	Silan Microelectronics	4870
SF1530	SF1530LGT	SiFirst	30xxx
SG5701	SG5701TZ	System General	AAExx
SG6848	SG6848T, SG6848T1, SG6848TZ1, SG6848T2	Fairchild / ON Semi	AAHxx EAxxx
SG6858	SG6858TZ	Fairchild / ON Semi	AAIxx
SG6859A	SG6859ATZ, SG6859ATY	Fairchild / ON Semi	AAJFxx
SG6859	SG6859TZ	Fairchild / ON Semi	AAJMxx
SG6860	SG6860TY	Fairchild	AAQxx
SP6850	SP6850S26RG	Sporton Lab	850xx
SP6853	SP6853S26RGB, SP6853S26RG	Sporton Lab	853xx
SW2263	SW2263MP	SamWin
UC3863/G	UC3863G-AG6-R	Unisonic Technologies Co	U863 U863G
XN1049	XN1049, XN1049TP	Innuovo Microelectronics	49 xxx

 

 PWM controllers that use pin 3 differently.

When using the following PWM (PWM controllers), you should pay attention to pin 3, which can be used to organize protection - thermal or from overvoltage of the input voltage.
The frequency can be fixed at 65kHz, or set by the value of the capacitor at pin 3.
When replacing any microcircuits with analogs, carefully study the documentation. PDF files are packed in a RAR archive.

 

Name	Part Number	Fabricant	Marking
AP3105/V/L/R	AP3105KTR-G1, AP3105VKTR-G1, AP3105LKTR-G1, AP3105RKTR-G1	Diodes Incorporated	GHN GHO GHP GHQ
AP3105NA/NV/NL/NR	AP3105NAKTR-G1, AP3105NVKTR-G1, AP3105NLKTR-G1, AP3105NRKTR-G1	Diodes Incorporated	GKN GKO GKP GKQ
AP3125A/V/L/R	AP3125AKTR-G1, AP3125VKTR-G1, AP3125LKTR-G1, AP3125RKTR-G1	Diodes Incorporated	GLS GLU GNB GNC
AP3125B	AP3125BKTR-G1	Diodes Incorporated	GLV
AP3125HA/HB	AP3125HAKTR-G1, AP3125HBKTR-G1	Diodes Incorporated	GNP GNQ
AP31261	AP31261KTR-G1	Diodes Incorporated	GPE
AP3127/H	AP3127KTR-G1, AP3127HKTR-G1	Diodes Incorporated	GPH GSH
AP3301	AP3301K6TR-G1	Diodes Incorporated	GTC
FAN6862	FAN6862TY	Fairchild / ON Semi	ABDxx
FAN6863	FAN6863TY, FAN6863LTY, FAN6863RTY	Fairchild / ON Semi	ABRxx
HT2273	HT2273TP	HOT-CHIP	73xxx
LD7510/J	LD7510GL, LD7510JGL	Leadtrend	xxP10 xxP10J
LD7530/A	LD7530PL, LD7530GL, LD7530APL, LD7530AGL	Leadtrend	xxP30 xxxP30A
LD7532	LD7532GL	Leadtrend	xxP32
LD7532A	LD7532AGL	Leadtrend	xxP32A
LD7532H	LD7532HGL	Leadtrend	xxP32H
LD7533	LD7533GL	Leadtrend	xxP33
LD7536	LD7536GL	Leadtrend	xxP36
LD7536R	LD7536RGL	Leadtrend	xxP36R
LD7537R	LD7537RGL	Leadtrend	xxP37R
LD7539C GL	LD7539C GL	Leadtrend	xxP39C
ME8204	ME8204M6G	MicrOne	ME8204xx
NCP1250	NCP1250ASN65T1G, NCP1250BSN65T1G, NCP1250ASN100T1G, NCP1250BSN100T1G	ON Semiconductor	25xxxx
NCP1251	NCP1251ASN65T1G, NCP1251BSN65T1G, NCP1251ASN100T1G, NCP1251BSN100T1G	ON Semiconductor	5xxxxx
OB2273	OB2273MP	On-Bright-Electronics	73xx
R7735	R7735AGE, R7735HGE, R7735GGE, R7735RGE, R7735LGE	Richtek
UC3873/G	UC3873-AG6-R, UC3873G-AG6-R	Unisonic Technologies	U873 U873G

 

A matrix (LED panel) V320BJ6-Q01 is installed.
To power the LED backlight using a converter, combined with the main board CV3463H-Q42, controlled by a PWM controller SO-8. As the power elements of LED-driver are used as TO-252-type switches.
The power module is combined with MainBoard and is designed as reverse-going converter of AC/DC voltage with PWM SOT23-6 chips and TO-252 type power switches.
MainBoard - the main board (motherboard) is a CV3463H-Q42 module, using SPI Flash chips: 25Q64 and others.
The NoName tuner provides reception of TV programs and tuning to channels.

More technical information about the panel:
Brand : CHIMEI INNOLUX
Model : V320BJ6-Q01
Type : A-Si TFT-LCD, CELL
Diagonal size : 31.5 inch
Resolution : 1366x768, WXGA
Display Mode : MVA, Normally Black, Transmissive
Active Area : 697.685x392.256 mm
Surface : Antiglare (Haze 2%)
Transmissivity : 6.0% (with Polarizer)
Contrast Ratio : 3000:1
Display Colors : 16.7M (6-bit + Hi-FRC)
Response Time : 8.5 (G to G)
Frequency : 60Hz
Signal Interface : LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0 V.

TELEFUNKEN TF-LED32S54T2 LCD TV V320BJ6-Q01 31.5" (80cm) diagonal 16:9 size. The brightness of the screen is 250 cd/m² provided by LED backlighting. Contrast, as the ratio of maximum brightness to minimum brightness, is 1200:1. The screen technology of this TV model features LED backlighting.
V320BJ6-Q01 matrix and MainBoard CV3463H-Q42 software implement HD picture quality at 1366x768 pixels resolution in 720p (HD Ready) graphic decomposition standard. Supported multimedia file formats are MP3, MPEG4, Xvid, MKV, JPEG.
The sound system has a capacity of 12 watts (2x6 watt) and is powered by two loudspeakers. NICAM STEREO audio processing system is used.
External interface (connection with other devices) is supported by standard inputs and outputs: antenna input (RF), component, VGA, HDMI x3, USB x2. There is a headphone output. The digital tuner receives DVB-T, DVB-T2, DVB-C TV channels.

The power supply is used as a part of MainBoard.

Dimensions: without stand 738x445x90mm.

TV weight without stand: 4.2 kg.

Warning. The V320BJ6-Q01 is an expensive and fragile part of your TELEFUNKEN TF-LED32S54T2 LED TV.
Do not apply any impact to the glass and do not exert any pressure on the screen surface to avoid damaging the LED panel!
Also it is not safe to get liquid on the screen. Sometimes one drop is enough if it drips down the glass onto the cables and the TV becomes unrepairable.
 

REPAIRING / SERVICING TV TELEFUNKEN TF-LED32S62T2

Technical description and composition of the TELEFUNKEN TF-LED32S62T2 TV, type of panel and modules used. Module composition.
Composition Specifications
TELEFUNKEN TF-LED32S62T2
LCD TV LED TF-LED32S62T2 | Year of manufacture: 2018
Screen diagonal: 31.5" (80 cm)
Screen Format: 16:9
Resolution: 1366x768
Refresh rate:     50Hz
LCD panel type: CX315DLEDM
LED backlight: Yes
Support HD: 720p HD
Brightness: 250 cd/m2
Contrast: 2400:1
Viewing Angle: 178°
Pixel response time: 8 msec
Progressive scan: Yes
Digital tuner: DVB-T, DVB-T2, DVB-C
Number of channels: 1100
Teletext: there is
Multimedia: MP3, WMA, MPEG4, Xvid, DivX, MKV, JPEG
Sound stereo: there is
Sound power: 6W (2x3W)
Acoustics: two speakers
Interface: AV, component, VGA, HDMI, USB x2
Headphone jack: yes
TV weight:     3.5 kg
Dimensions: with stand 729x469x168mm
without stand 729x429x76 mm


TELEFUNKEN LED Model: TF-LED32S62T2

Chassis/Version: CV512H-U42

Panel: CX315DLEDM

LED driver (backlight): integrated into MainBoard

PWM LED driver: BIT3267

MOSFET LED driver: MDD1051

Power Supply (PSU): integrated into MainBoard

PWM Power: PWM SOT23-6 OB2262

MOSFET Power: TO-252

MainBoard: CV512H-U42

IC MainBoard: SPI Flash: W25Q64, Audio: RDA3118E28 (TPA3110)

MainBoard: CDT-9NT372
General recommendations for LCD LED TV repair
Possible trouble spots

- TELEFUNKEN TF-LED32S62T2 does not turn on or does not show any signs of operation at all. It doesn't blink and doesn't respond to the control buttons.

In this case the defect may be the main switching power supply - AC/DC voltage converter, elements of which are located on the MainBoard CV512H-U42. It is necessary to measure its output voltages, and in case of their absence (full or partial), it is necessary to check the serviceability of power keys (TO-252) of converters and rectifier diodes for possible short circuit.
At breakdowns in the secondary circuits, the inverter, as a rule, can work in short-circuit mode, and at short circuit in the power elements of the primary circuit usually burst the mains fuse.
Breakdown of power switches (MosFet) in pulsed sources, sometimes caused by faults in other circuit elements, for example, in the circuits that feed the PWM controller, frequency-retaining or damping circuits, as well as in the negative feedback (negative feedback) stabilization circuits. PWM regulators (PWM) PWM SOT23-6, if they do not have visible case damage and outright short circuits between pins, are usually checked by replacement.

- No picture, sound is present, remote responds, channels are switched. In some cases, the image appears when you turn on and immediately disappears.

Usually in such cases there is no backlight of the LED panel (matrix). The reason for this may be a breakage in the circuit of the LEDs, or a problem in stabilizing their power supply.
To check the LED arrays for breakage without disassembling the panel, you can, for example, use a power supply. It is not possible to open the series-connected PN-junctions with a simple multimeter, you need a voltage of about several tens of volts.

If your TELEFUNKEN TF-LED32S62T2 has no picture but has sound, often the CX315DLEDM display backlight simply does not work. Moreover, in LED TVs usually fail the LEDs inside the panel, less often the LED-driver.
In such cases you can see a faintly visible image when external light hits the screen.

To replace the LEDs requires disassembly of the LCD panel CX315DLEDM - the process requiring a master of experience and expertise. We do not recommend to perform such works by yourself to owners of TV sets and craftsmen who have no experience in LCD panel repair.

READ HOW TO REPAIR THE TV LED BACKLIGHT --------------> HERE.

If there is no image, but backlighting works - the screen becomes slightly lighter when the TV is turned on, and in the open TV you can see the light through the holes in the body of the panel.

In this case the panel may be defective - damage to the strips, cables, for example, as a consequence of moisture after an unsuccessful washing of the screen, the T-CON board (Timing Controller) may be defective. But quite often the CV512H-U42 MainBoard is faulty as well and so is the software.
Then first it is necessary to check the panel power supply voltage, fuses on the T-CON board, as well as the supply and reference voltages of the column and line drivers - VGH, VGL, Vcom.

If these measurements are within normal limits, it is necessary to trace by oscilloscope LVDS signals from MainBoard CV512H-U42, as well as synchronizing signals to driver stubs.

Filled or unsuccessfully washed LED TV screens can be restored in about half of the cases, usually, if there is no significant damage to the panel stubs and slats.


- Indicator on the front panel is blinking, the TV set does not turn on in the working mode, the remote control does not react.

Repair or diagnostic of the CV512H-U42 motherboard should be started with checking the stabilizers and power converters needed to power the chips and matrix. If necessary, software (software) should be updated or replaced. Repair and replacement of SPI Flash: W25Q64, Audio: RDA3118E28 (TPA3110) chips are made with the necessary equipment and the appropriate element base. Malfunctions associated with the use of soldering technology BGA processor can be localized by the method of heating.

Before replacing the CDT-9NT372 tuner if you cannot tune to the TV channels, make sure the supply voltages are present and measure them on the corresponding pins of the tuner and check the software for correctness. You can control the tuner's communication pulses with the processor with an oscilloscope

Once again, users must be reminded! Trying to repair your TELEFUNKEN TF-LED32S62T2 without proper skill and experience may result in its total unrepairability.

DOWNLOAD SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>   Chassis CV512H-U42.

DOWNLOAD FIRMWARE FOR SPI FLASH  ----------->  TELEFUNKEN TF-LED32S62T2, Main: CV512H-U42, Panel: CX315DLEDM.


After repair of CX315DLEDM, CV512H-U42, BIT3267 backlight. Information from the master.

Reduce backlight current - removed two 1.5 Ohm resistors in the LED driver current sensor on the CV512H-U42 board.
Driver current limitation. CV512H-U42, BIT3267S. General Information.

To decrease the backlight current in the TV sets with the CV512H-U42 board and the LED driver chip BIT3267, you should increase the total resistance of the low resistance current sensor resistors connected to the pin 5 INN of the BIT3267 chip.
The required total resistance of the sensor resistors RLed connected in series can be calculated from the ratio RLed = 0.21/ILed.
On the V512H-U42 board these are resistors PR182, PR183, R203, PR238 next to diodes PD6 and PD21 (M7).
CV512H-U42 current backlight.

A pdf document is included. ---------> BIT3267.
 

More on MainBoard Repair

The appearance of the MainBoard CV512H-U42 is shown in the figure below:

CV512H-U42.

The CV512H-U42 can be used in televisions:DEXP H39D7000Q (Panel LC390TA2A), SUPRA STV-LC32LT0010W (Panel KM0320LDRH0037).

 

PWM SMPS in SOT-23-6, SOT-26, TSOP-6 packages

In the circuitry of modern switching power supplies (SMPS), PWM controllers made in small-sized planar packages with six terminals have gained wide popularity. The enclosure type designation can be SOT-23-6, SOT-23-6L, SOT-26, TSOP-6, SSOT-6. The appearance and arrangement of the pins are shown in the figure below. In this case, the code marking LD7530A is shown on the left fragment of the picture.


 

 Pin assignment:
1 - GND. (Common wire).
2 - FB. (FeedBack - Feedback). Input for controlling the duration of pulses with a signal from the output voltage. Sometimes it can be labeled COMP (input comparator).
3 - RI / RT / CT / COMP / NC - Depending on the type of microcircuit, it can be used for a frequency-setting RC circuit (RI / RT / CT), or for organizing protection, as an input of a PWM trip comparator at a threshold value at its input, specified in the document. In some types of microcircuits, this input may not be used in any way (NC - No Connect).
4 - SENSE, otherwise CS (Current Sense) - Input from the current sensor at the source of the key.
5 - VCC - Input voltage supply and start of the microcircuit.
6 - OUT (GATE) - Output for controlling the gate (Gate) of the key.

Functionally, these regulators work on the principle of the previously popular xx384x PWM microcircuits, which have proven themselves well in terms of reliability and stability.

Some difficulties often arise when replacing or choosing an analog for such PWM regulators due to the use of code markings in the designation of the type of microcircuits. The situation is complicated by a large number of component manufacturers who do not always provide documentation to the mass access, just as not all manufacturers of finished devices supply repair service centers with diagrams, so repairmen often have to study real circuit solutions by installed components and wiring connections directly on the board.

In practice, PWM microcircuits and the marking code EAxxx and Eaxxx are often found. Official documentation for them was not found in the public domain, but discussions on the forums and pieces of pictures from PDF from System General, which publishes them as SG6848T and SG6848T2, have survived. The drawing is here placed left .


 

For the attention of the masters, here below are PDF datasheet tables compiled from information available on the Internet and PDF documents for the selection of analogues types when replacing the most common six-legged planar PWM with pinout pins: pin1 - GND, pin2 - FB (COMP), pin4 - Sense, pin5 - Vcc, pin6 - OUT ...
Their main difference is the application and purpose of pin 3. 

 

Name	Part Number	Fabricant	Marking
SG6849	SG684965TZ	Fairchild / ON Semi	BBxx
SG6849	SG6849-65T, SG6849-65TZ	System General	MBxx EBxx
SGP400	SGP400TZ	System General	AAKxx

 

 PWM controllers (PWM) with a 95-100 kOhm resistor on pin 3.

When applying the PWM listed below, the frequency should be set with the RT (RI) resistor from pin 3 to ground. Usually its nominal value is chosen 95-100 kOhm for a frequency of 65-100 KHz. For more details, see the here below attached documentation. PDF files are packed in RAR.

 

Name	Part Number	Fabricant	Marking
AP3103A	AP3103AKTR-G1	Diodes Incorporated	GHL
AP8263	AP8263E6R, A8263E6VR	AiT Semiconductor	S1xx
AT3263	AT3263S6	ATC Technology	3263
CR6848	CR6848S	Chip-Rail	848H16
CR6850	CR6850S	Chip-Rail	850xx
CR6851	CR6851S	Chip-Rail	851xx
FAN6602R	FAN6602RM6X	Fairchild / ON Semi	ACCxx
FS6830	FS6830	FirstSemi
GR8830	GR8830CG	Grenergy	30xx
GR8836	GR8836C, GR8836CG	Grenergy	36xx
H6849	H6849NF	HI-SINCERITY
H6850	H6850NF	HI-SINCERITY
HT2263	HT2263MP	HOT-CHIP	63xxx
KP201		Kiwi Instruments
LD5530	LD5530GL LD5530R	Leadtrand	xxt30 xxt30R
LD7531	LD7531GL, LD7531PL	Leadtrend	xxP31
LD7531A	LD7531AGL	Leadtrend	xxP31A
LD7535/A	LD7535BL, LD7535GL, LD7535ABL, LD7535AGL	Leadtrend	xxP35-xxx35A
LD7550	LD7550BL, LD7550IL	Leadtrend	xxP50
LD7550B	LD7550BBL, LD7550BIL	Leadtrend	xxP50B
LD7551	LD7551BL/IL	Leadtrend	xxP51
LD7551C	LD7551CGL	Leadtrend	xxP51C
NX1049	XN1049TP	Xian-Innuovo	49xxx
OB2262	OB2262MP	On-Bright-Electronics	62xx
OB2263	OB2263MP	On-Bright-Electronics	63xx
PT4201	PT4201E23F	Powtech	4201
R7731	R7731GE/PE	Richtek	0Q=
R7731A	R7731AGE	Richtek	IDP=xx
SD4870	SD4870TR	Silan Microelectronics	4870
SF1530	SF1530LGT	SiFirst	30xxx
SG5701	SG5701TZ	System General	AAExx
SG6848	SG6848T, SG6848T1, SG6848TZ1, SG6848T2	Fairchild / ON Semi	AAHxx EAxxx
SG6858	SG6858TZ	Fairchild / ON Semi	AAIxx
SG6859A	SG6859ATZ, SG6859ATY	Fairchild / ON Semi	AAJFxx
SG6859	SG6859TZ	Fairchild / ON Semi	AAJMxx
SG6860	SG6860TY	Fairchild	AAQxx
SP6850	SP6850S26RG	Sporton Lab	850xx
SP6853	SP6853S26RGB, SP6853S26RG	Sporton Lab	853xx
SW2263	SW2263MP	SamWin
UC3863/G	UC3863G-AG6-R	Unisonic Technologies Co	U863 U863G
XN1049	XN1049, XN1049TP	Innuovo Microelectronics	49 xxx

 

 PWM controllers that use pin 3 differently.

When using the following PWM (PWM controllers), you should pay attention to pin 3, which can be used to organize protection - thermal or from overvoltage of the input voltage.
The frequency can be fixed at 65kHz, or set by the value of the capacitor at pin 3.
When replacing any microcircuits with analogs, carefully study the documentation. PDF files are packed in a RAR archive.

 

Name	Part Number	Fabricant	Marking
AP3105/V/L/R	AP3105KTR-G1, AP3105VKTR-G1, AP3105LKTR-G1, AP3105RKTR-G1	Diodes Incorporated	GHN GHO GHP GHQ
AP3105NA/NV/NL/NR	AP3105NAKTR-G1, AP3105NVKTR-G1, AP3105NLKTR-G1, AP3105NRKTR-G1	Diodes Incorporated	GKN GKO GKP GKQ
AP3125A/V/L/R	AP3125AKTR-G1, AP3125VKTR-G1, AP3125LKTR-G1, AP3125RKTR-G1	Diodes Incorporated	GLS GLU GNB GNC
AP3125B	AP3125BKTR-G1	Diodes Incorporated	GLV
AP3125HA/HB	AP3125HAKTR-G1, AP3125HBKTR-G1	Diodes Incorporated	GNP GNQ
AP31261	AP31261KTR-G1	Diodes Incorporated	GPE
AP3127/H	AP3127KTR-G1, AP3127HKTR-G1	Diodes Incorporated	GPH GSH
AP3301	AP3301K6TR-G1	Diodes Incorporated	GTC
FAN6862	FAN6862TY	Fairchild / ON Semi	ABDxx
FAN6863	FAN6863TY, FAN6863LTY, FAN6863RTY	Fairchild / ON Semi	ABRxx
HT2273	HT2273TP	HOT-CHIP	73xxx
LD7510/J	LD7510GL, LD7510JGL	Leadtrend	xxP10 xxP10J
LD7530/A	LD7530PL, LD7530GL, LD7530APL, LD7530AGL	Leadtrend	xxP30 xxxP30A
LD7532	LD7532GL	Leadtrend	xxP32
LD7532A	LD7532AGL	Leadtrend	xxP32A
LD7532H	LD7532HGL	Leadtrend	xxP32H
LD7533	LD7533GL	Leadtrend	xxP33
LD7536	LD7536GL	Leadtrend	xxP36
LD7536R	LD7536RGL	Leadtrend	xxP36R
LD7537R	LD7537RGL	Leadtrend	xxP37R
LD7539C GL	LD7539C GL	Leadtrend	xxP39C
ME8204	ME8204M6G	MicrOne	ME8204xx
NCP1250	NCP1250ASN65T1G, NCP1250BSN65T1G, NCP1250ASN100T1G, NCP1250BSN100T1G	ON Semiconductor	25xxxx
NCP1251	NCP1251ASN65T1G, NCP1251BSN65T1G, NCP1251ASN100T1G, NCP1251BSN100T1G	ON Semiconductor	5xxxxx
OB2273	OB2273MP	On-Bright-Electronics	73xx
R7735	R7735AGE, R7735HGE, R7735GGE, R7735RGE, R7735LGE	Richtek
UC3873/G	UC3873-AG6-R, UC3873G-AG6-R	Unisonic Technologies	U873 U873G

 

The main features of the device TELEFUNKEN TF-LED32S62T2:

CX315DLEDM matrix (LED panel) is installed.
To power the LED backlight using a converter, combined with the main board CV512H-U42, controlled by a PWM controller BIT3267. As the power elements of the LED-driver switches of MDD1051 type are used.
The power module is integrated into the MainBoard and is designed as a reverse-going AC/DC converter with PWM SOT23-6 OB2262 chips and TO-252 type power keys.
MainBoard - the main board (motherboard) is a CV512H-U42 module, using SPI Flash: W25Q64, Audio: RDA3118E28 (TPA3110) and other microcircuits.
The CDT-9NT372 tuner provides TV program reception and channel tuning.

TELEFUNKEN TF-LED32S62T2 TV with CX315DLEDM LCD screen measuring 31.5" (80 cm) diagonally in 16:9 aspect ratio. The screen luminance of 250 cd/m² is provided by an LED backlight. Contrast, as the ratio of maximum brightness to minimum brightness, is 2400:1. The screen technology of this TV model features LED backlighting.
Matrix CX315DLEDM and MainBoard CV512H-U42 software implement HD picture quality at 1366x768 pixels resolution in 720p (HD Ready) graphic decomposition standard. Supported multimedia file formats are MP3, WMA, MPEG4, Xvid, DivX, MKV, JPEG.
The speaker system has 6W (2x3W) sound power provided by the two speakers. NICAM STEREO audio processing system is used.
External interface (connection with other devices) is supported by standard inputs and outputs: antenna input (RF), AV, component, VGA, HDMI, USB x2. There is a headphone output. The digital tuner receives DVB-T, DVB-T2, DVB-C TV channels.

The power supply is used in the MainBoard.

Dimensions: with stand 729x469x168 mm, without stand 729x429x76 mm.

TV weight: 3.5 kg.

Warning. The CX315DLEDM is an expensive and fragile part of your TELEFUNKEN TF-LED32S62T2 LED TV.
Do not apply any impact to the glass and do not exert any pressure on the screen surface to avoid damaging the LED panel!
Also it is not safe to get liquid on the screen. Sometimes one drop is enough if it drips down the glass onto the cables and the TV becomes unrepairable.

REPAIRING / SERVICING TV TELEFUNKEN TF-LED32S74T2

Technical description and composition of the TELEFUNKEN TF-LED32S74T2 TV, type of panel and modules used. Module composition.

Composition Specifications
TELEFUNKEN TF-LED32S74T2
LCD TV LED TF-LED32S74T2 | Year of manufacture: 2018
Screen diagonal: 31.5" (80 cm)
Screen Format: 16:9
Resolution: 1366x768
Refresh rate:     50Hz
LED backlight: Yes
Support HD: 720p HD
Brightness: 220 cd/m2
Contrast: 3000:1
Viewing Angle: 160°
Pixel response time: 8.5 ms
Progressive scan: Yes
Digital tuner: DVB-T, DVB-T2, DVB-C, DVB-S, DVB-S2
Number of channels: 1099
Teletext: there is
Multimedia: MP3, WMA, MPEG4, Xvid, MKV, JPEG
Sound stereo: there is
Sound Power: 12W (2x6W)
Acoustics: two speakers
Interface: AV, component, HDMI x2, USB
TV weight:     4 kg


TELEFUNKEN LED
Model: TF-LED32S74T2

Chassis/Version: TP.MS3663T.PB751

Panel: V320BJ6-Q01 320E66(CW3) REV.00

LED driver (backlight): integrated into MainBoard

PWM LED driver: OB3353CP

MOSFET LED driver: TO-252

Power Supply (PSU): integrated into MainBoard

PWM Power: PWM SOT23-6

MOSFET Power: TO-252

MainBoard: TP.MS3663T.PB751

IC MainBoard: CPU: MSD3663LSAT, SPI Flash: 25Q64

MainBoard: XF-3SET-HP & SAT
General recommendations for LCD LED TV repair
Possible defects

- TELEFUNKEN TF-LED32S74T2 doesn't turn ON, the buttons and remote control don't respond and the indicators on the front panel are not glowing or blinking.

In this case the problem may be the main source of power supply - AC/DC converter, elements of which in this model are located on the common MainBoard TP.MS3663T.PB751. It is necessary to measure its secondary output voltages, and if not, check the power switches (TO-252) and the rectifier diodes in the converters for short circuits.
At breakdown of semiconductors in the secondary circuits of any converter, as a rule, it can operate in the emergency short-circuit mode without output voltages, and at short circuit in the elements of the primary circuit most often immediately burst the mains fuse and less often the current sensor at the source of the key.
Breakdown of Mos-Fet switches, used in pulse sources, is often caused by failure of other elements, for example, in PWM regulator supply circuit, in frequency-retaining or damping circuits, as well as in the Negative Feedback Stabilization. PWM chips (PWM) PWM SOT23-6 are usually checked by replacing them with new ones or with ones known to be in good working order.

- No picture, sound is there, remote control responds. Or the image may appear for a second and then immediately disappear.

The problem in these cases is usually the most probable in the nodes of the display matrix backlight. The cause of this may be a break in the circuit of the LEDs, or a problem in stabilizing their power supply.
Without a special current source it is impossible to check the line of LEDs in series, and it is not safe to use any voltage sources over 12v for this purpose. The only thing you have to do is to open the panel and check each LED separately. Usually Chinese multimeters with 9V power supply will light up one 3 volt LED a bit if you connect the probes to it in forward direction, red probe to anode, black probe to cathode. For twin 6-volt LEDs, the PN junction of its faulty regulator can be used as an indicator of the health of the LED. If the LED is faulty, its regulator will either be open or shorted.

If TELEFUNKEN TF-LED32S74T2 has no picture but you have sound, often the display backlight of V320BJ6-Q01 320E66(CW3) REV.00 is simply not working. Moreover, in LED TVs, the LEDs inside the panel usually fail, more rarely the LED driver.
In such cases you can see a faintly visible image when external light hits the screen.

To replace the LEDs requires disassembly of the LCD panel V320BJ6-Q01 - the process requiring a master of experience and expertise. We do not recommend to perform such works by yourself to owners of TV sets and craftsmen who have no experience in LCD panel repair.

READ HOW TO REPAIR THE TV LED BACKLIGHT --------------> HERE.

If there is no image, but backlighting works - the screen becomes slightly lighter when the TV is turned on, and in the open TV you can see the light through the holes in the body of the panel.
In this case the panel may be defective - damage to the strips, cables, for example, as a consequence of moisture after an unsuccessful washing of the screen, the T-CON board (Timing Controller) may be defective. But quite often the MainBoard TP.MS3663T.PB751 is also faulty, so software defects are also possible.
Then first it is necessary to check the panel power supply voltage, the fuses on the T-CON board, as well as the supply and reference voltages of the column and line drivers - VGH, VGL, Vcom.
If these measurements are within normal limits, you need to trace by oscilloscope the LVDS signals from MainBoard TP.MS3663T.PB751, as well as synchronizing signals to driver stubs.

Filled or badly washed LED TV screens can be repaired in about half of the cases, usually, if there is no significant damage in the cables and panel bars.

- Front panel LED is blinking, TV set does not turn on, remote control is unresponsive.

Repair or diagnostic of the TP.MS3663T.PB751 motherboard begins with checking the stabilizers and power converters needed to power the microcircuits and the matrix. If necessary you should update or replace the software (firmware). Complex repair of MB board (SSB) in some cases is possible and practiced by repairmen. To do this, you should check and, if necessary, replace elements CPU: MSD3663LSAT, SPI Flash: 25Q64. BGA chips failures are usually easy to detect with heating method.

If the TV works normally from external devices, but does not tune to the TV channels, the XF-3SET-HP & SAT tuner might be defective. In these cases you should first check if there is power to the corresponding pins of the XF-3SET-HP & SAT. Also make sure that the tuner and the processor are communicating via the I2C bus. Sometimes the tuner malfunction can be caused by a software malfunction.

Once again, users must be reminded! Trying to repair your TELEFUNKEN TF-LED32S74T2 without proper skill and experience may result in its total inoperability.

DOWNLOAD SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>    Chassis TP.MS3663T.PB751.

 

 DOWNLOAD FIRMWARE FOR SPI FLASH  ----------->  TELEFUNKEN TF-LED32S74T2, Main: TP.MS3663T.PB751, Panel: V320BJ6-Q01 320E66(CW3) REV.00.

 

Refinement after the repair of the backlight. TP.MS3663T.PB751, OB3353CP. Information from the master.

Reduce backlight current from 530 mA to 270 mA - removed two 1.6 Ohm resistors in the driver current sensor on the TP.MS3663T.PB751 board, leaving two 1.5 Ohms.
Limiting the driver current. TP.MS3663T.PB751. General information.

On TV's with TP.MS3663T.PB751 board and OB3353CP LED driver chip you must increase the total resistance of the four current sensor resistors connected in parallel, RB837, RB838, RB839, RB840, to reduce the backlighting current. You can remove one or two of them, or increase the ratings, then the total resistance of the sensor will increase and the backlight current will decrease proportionally.
TP.MS3663T.PB751 current backlight.

  Ways to limit the current in LED backlight drivers:

There is a lot of information on the Internet about ways to limit the current in the LED backlighting for different TVs and LED drivers. A lot of it is written plausibly but sometimes it is written by people far from electronics in order to publish any popular content on hot topics to boost web-sites ratings.

It's impossible to talk about each case separately within one article, because even similar models may have different panels and different boards with their own driver variants. But there are basic principles that are clear to craftsmen with even minimal knowledge and skill.

Other popular, complex and controversial current limit cases will be published as information becomes available.
There are three basic ways to reduce the backlight current.

1. By increasing the resistance of the LED current sensor - a low-resistance measuring resistor in the cathode (LED-) circuit.
2. Increasing the ratings of the resistors on the ISET (current setting) input of the LED driver chip.
3. changing the resistor ratings in the divider on the ADIM (Dimming) control input.

The fundamental difference between input ISET and ADIM is that ISET - input inverted, as FB, and ADIM - direct.

More on MainBoard repairs
The MainBoard TP.MS3663T.PB751 is shown in the illustration below:

TP.MS3663T.PB751

The main features of the TELEFUNKEN TF-LED32S74T2:

A matrix (LED panel) V320BJ6-Q01 320E66(CW3) REV.00 is installed.
A converter combined with the main board TP.MS3663T.PB751, controlled by the PWM controller OB3353CP, is used to power the backlight LEDs. As power elements of the LED-driver are used as TO-252-type switches.
The power module is combined with MainBoard and is designed as reverse-going AC/DC converter with PWM SOT23-6 chips and TO-252 type power switches.
MainBoard - the main board (motherboard) is a module TP.MS3663T.PB751, with the use of chip CPU: MSD3663LSAT, SPI Flash: 25Q64 and others.
The XF-3SET-HP & SAT tuner provides TV reception and channel tuning.

More technical information about this panel:
Brand : CHIMEI INNOLUX
Model : V320BJ6-Q01
Type : A-Si TFT-LCD, CELL
Diagonal size : 31.5 inch
Resolution : 1366x768, WXGA
Display Mode : MVA, Normally Black, Transmissive
Active Area : 697.685x392.256 mm
Surface : Antiglare (Haze 2%)
Transmissivity : 6.0% (with Polarizer)
Contrast Ratio : 3000:1
Display Colors : 16.7M (6-bit + Hi-FRC)
Response Time : 8.5 (G to G)
Frequency : 60Hz
Signal Interface : LVDS (1 ch, 8-bit), 30 pins
Voltage : 12.0V

TELEFUNKEN TF-LED32S74T2 LCD TV set V320BJ6-Q01 31.5" (80cm) diagonal 16:9 size. The screen luminance of 220 cd/m² is provided by an LED backlight. Contrast, as the ratio of maximum brightness to minimum brightness, is 3000:1. The screen technology of this TV model features LED backlighting.
Matrix V320BJ6-Q01 and MainBoard software TP.MS3663T.PB751 implement HD image quality at a resolution of 1366x768 pixels in 720p (HD Ready). Supported multimedia file formats are MP3, WMA, MPEG4, Xvid, MKV, JPEG.
The speaker system has a sound power of 12 W (2x6 W) provided by the two speakers. NICAM STEREO audio processing system is used.
External interface (communication with other devices) is supported by standard inputs and outputs: antenna input (RF), AV, component, HDMI x2, USB. The digital tuner is capable of receiving DVB-T, DVB-T2, DVB-C, DVB-S, DVB-S2 TV channels.

The power supply is used as part of the MainBoard.

Overall dimensions: 732x481x195 mm.

TV weight: 4 kg.

Warning. The V320BJ6-Q01 320E66(CW3) REV.00 LED TV TELEFUNKEN TF-LED32S74T2 is an expensive and unreliable component.
Do not apply any impact to the glass and do not exert any pressure on the screen surface to avoid damaging the LED panel!
Also it is not safe to get liquid on the screen. Sometimes one drop is enough, if it drips down the glass onto the flat cables to make the TV set unrepairable.

 

REPAIRING / SERVICING TV LG 42LF650V

 Technical description and composition of LG 42LF650V TV, type of panel and modules used. Module composition.
Composition
Specifications
LG 42LF650V
Smart TV 3D 42LF650V | Year of manufacture: 2015
Screen diagonal: 42" (107 cm)
Screen format: 16:9
Resolution: 1920x1080
refresh rate: 100 Hz
LCD panel type: LC420DUH-MGP1
LED backlight: Yes, Direct LED
Smart: Yes. Wi-Fi support: yes
Operating system: webOS
3D support: yes, polarizing technology, 2D to 3D conversion
Supports HD: 1080p Full HD
Progressive scan: yes
TV standards: PAL, SECAM, NTSC
Digital tuner: DVB-T, DVB-T2, DVB-C, DVB-S2
Teletext: there is
DTV formats: 480i, 480p, 576i, 576p, 720p, 1080i, 1080p
Multimedia: MP3, WMA, MPEG4, HEVC (H.265), DivX, MKV, JPEG
Stereo sound: there is
Sound power: 20W (2x10W)
Acoustics: two speakers
Interface: AV, component, HDMI x3, USB x3, Ethernet (RJ-45), Bluetooth, Wi-Fi, WiDi, Miracast
Headphone jack: yes

LG LED
Model: 42LF650V

Chassis/Version: LD/LE51H

Panel: LC420DUH (MG)(P1)

LED driver (backlight): integrated into MainBoard

PWM LED driver: LC5901

MOSFET LED driver: TO-252

Power Supply (PSU): EAX66203001 (1.6) LGP3942D-15CH1

PWM Power: PFC, PWM

MainBoard: EAX66207203 (1.0)

IC MainBoard: AT24C256, H26M31001HPR (e-NAND), K4B4G1646D-BCK0, K4B2G1646Q-BCK0, TPS65175B, NTP7515D

Tube: TDJM-G301D
General recommendations for LCD LED TV repair
Possible trouble spots

- LG 42LF650V TV does not turn on at all. Control lights are not glowing or blinking. TV does not respond to remote control and control panel buttons.

Usually with such manifestations the defect is caused by the defective elements in the main power supply module EAX66203001. It is necessary to measure its output voltages and in case of their absence check the power switches and rectifier diodes for possible short circuits in the converters.
With any breakdown of semiconductors in the secondary circuits, the inverter can usually operate normally in the emergency short-circuit mode. In this case there are no output voltages. And when a short circuit occurs in the power elements of the primary circuit, as a rule, the mains fuse and rarely the current sensor at the source of the switch break down.
Mos-Fet power switches, used in switching power supplies, sometimes fail because of failure of any other elements, which can take it out of the key mode, or cause exceeding the maximum allowable parameters of the switch. These can be the elements that feed the PWM controller, the frequency or damping circuits, or the negative feedback elements in the stabilization circuit. PFC, PWM controllers, if there is no visible damage or outright short circuits between pins, are checked by replacing with new or known good ones.

If the LG 42LF650V has no picture but has sound, often the display backlight of the LC420DUH (MG)(P1) simply does not work. Moreover, in LED-TVs usually fail LEDs inside the panel, less often the LED-driver.
In such cases you can see faintly visible image when external light hits the screen.

To replace the LEDs requires disassembly of the LCD-panel LC420DUH - the process requiring a master of experience and expertise. Do not perform such work by yourself to owners of TV sets and craftsmen who do not have experience in repairing LCD-panels.

READ HOW TO REPAIR THE TV LED BACKLIGHT --------------> HERE.

If there is no image, but backlighting works - the screen becomes slightly lighter when the TV is turned on, and in the open TV you can see the light through the holes in the body of the panel.
In this case the panel may be defective - damage to the strips, cables, for example, as a consequence of moisture after an unsuccessful washing of the screen, the T-CON board (Timing Controller) may be defective. But quite often the MainBoard EAX66207203 is defective, and software failure is also possible.
Then first it is necessary to check the panel power supply voltage, fuses on the T-CON board, as well as the supply and reference voltages of the column and line drivers - VGH, VGL, Vcom.
If these measurements are within normal limits, it is necessary to trace LVDS signals from MainBoard EAX66207203, as well as synchronizing signals to driver stubs with oscilloscope.

Filled or unsuccessfully washed LED TV screens can be restored in about half of the cases, usually, if there is no significant damage in the panel stubs and slats.

- No picture, sound is present, and the remote control responds. Or the image may appear for a second and then disappear at once.

As a rule, in such cases there is no display backlight. The reason for this may be a breakage in the circuit of the LEDs, or a problem in stabilizing their power supply.
To find the breakage in the lines of LEDs without disassembling the panel you will need a power source. It is impossible to open the transitions connected in series by simple multimeter, you need a voltage of several tens of volts.

- Indicator is blinking or glowing constantly, TV set doesn't turn on, remote control doesn't respond.

Repair or diagnosis of the motherboard EAX66207203 should begin with a check of the stabilizers and power converters needed to power the chips and matrix. If necessary, the software (software) should be updated or replaced. Often the MB board (SSB) has to be replaced if it has complex faults, which are hard to detect. When trying to repair it should be checked its elements - AT24C256, H26M31001HPR (e-NAND), K4B4G1646D-BCK0, K4B2G1646Q-BCK0, TPS65175B, NTP7515D and, failed chips replace with new ones. Some faults may be associated with the use of modern Main Board BGA soldering technology. Usually such defects are detected by local heating of the chip.

If the TV set works normally from external devices, but does not tune to the TV channels, the TDJM-G301D tuner may be defective. In such cases you should first check if there is any voltage supply to the corresponding pins. Also make sure that the tuner and the processor are communicating via the I2C bus. Sometimes a software malfunction can be the reason for the malfunction of the tuner.

Once again, please remind TV users not to try to repair it yourself, without the appropriate knowledge, experience, and necessary qualification! 

Trust repairs to professionals with sufficient experience in the field of electronic repair.

DOWNLOAD SCHEMATIC DIAGRAM  / SERVICE MANUAL ------------------>CHASSIS : LD51H   42LF65**, 42LF65*-Z* (42LF650, 42LF6500, 42LF650V, 42LF650T, 42LF652, 42LF652V-ZA, 42LF653, 42LF653V-ZC).

 After repair of backlight EAX66203001, LC5901. Information from the master.

Reduce backlight current from 250 mA to 150 mA - replaced R816 3.0 Ohm resistor with 4.7 Ohm in the backlight current sensor on EAX66203001 board.
Limiting the driver current. EAX66203001 and LC5901. General information.

You can reduce the backlight current in LGP3942D-15CH1 (EAX66203001) TVs with the LC5901 straight-through step-down driver by increasing the current sensor resistance at the source of the converter switch.
The standard current in the LEDs is 250 mA. The current sensor is a 3 ohm resistor R816. If you increase the rating to 4.3 Ohm, the current will decrease to 175 mA.
EAX66203001 current backlight
The second way to decrease the backlight current is to decrease the resistor on pin 8 of the REF LC5901 to ground.

A PDF of the ------------------>  LC5901 is included.

  Ways to limit the current in LED backlight drivers:

There is a lot of information on the Internet about ways to limit the current in the LED backlighting for different TVs and LED drivers. A lot of it is written plausibly but sometimes it is written by people far from electronics in order to publish any popular content on hot topics to boost web-sites ratings.

It's impossible to talk about each case separately within one article, because even similar models may have different panels and different boards with their own driver variants. But there are basic principles that are clear to craftsmen with even minimal knowledge and skill.

Other popular, complex and controversial current limit cases will be published as information becomes available.
There are three basic ways to reduce the backlight current.

1. By increasing the resistance of the LED current sensor - a low-resistance measuring resistor in the cathode (LED-) circuit.
2. Increasing the ratings of the resistors on the ISET (current setting) input of the LED driver chip.
3. changing the resistor ratings in the divider on the ADIM (Dimming) control input.

The fundamental difference between input ISET and ADIM is that ISET - input inverted, as FB, and ADIM - direct.

More on MainBoard Repair

The MainBoard EAX66207203 is shown in the figure below:

EAX66207203

The EAX66207203 can be used in televisions:

LG 50LF653V (Panel LC500DUH (MG)(P1)), LG 40LF630V 40LF630V-ZA.BRUJLDU (Panel V400HJ6-PE2 HC400DUN-VCKN1-214X), LG 40LF634V (Panel V400HJ6-PE2 Rev.C1 HC400DUN-VCKN1-214X).

The appearance of the power supply

The main features of the LG 42LF650V device:

The matrix (LED panel) LC420DUH (MG)(P1) is installed.
To power the LED backlight is used converter, combined with the main board EAX66207203, controlled by the PWM controller LC5901. As the power elements of LED-driver are used switches type TO-252.
Necessary supply voltages for all LG 42LF650V TV nodes are formed by the power module EAX66203001, or its analogues with the use of PFC, PWM chips.
MainBoard - the main board (motherboard) is EAX66207203 module, using AT24C256, H26M31001HPR (e-NAND), K4B4G1646D-BCK0, K4B2G1646Q-BCK0, TPS65175B, NTP7515D and other chips.
The TDJM-G301D tuner provides TV program reception and channel tuning.

More technical information about this panel:
Brand : LG Display
Model : LC420DUH-MGP1
Type : A-Si TFT-LCD, Panel
Diagonal size : 42 inch
Resolution : 1920x1080, FHD
Display Mode : IPS, Normally Black, Transmissive
Active Area : 927.94x521.96 mm
Surface : Antiglare (Haze 1%), Hard coating (2H)
Brightness : 300 cd/m²
Contrast Ratio : 1200:1
Display Colors : 16.7M (8-bit), CIE1931 68%
Response Time : 6/8 (Tr/Td)
Frequency : 120Hz
Lamp Type : WLED Without Driver
Signal Interface : EPI, 100 pins
Voltage : 12.0V

Instructions and updates

There are downloadable files for the 42LF650V from the manufacturer:

Update and instruction files:
File Description File Name Type Date Size
SW File (Version 04.06.40) . TV_Software_Update_Guide_v3.pdf PDF 29.05.2020 2014K update instructions
SW File (Version 04.06.40) . Firmware (USB) Software_File(Version_04.06.40).zip zip 29.05.2020 683861K
Compatible with 32LF6309-ZA, 32LF630V-ZA, 32LF6319-ZB, 32LF631V-ZB, 32LF6329-ZC, 32LF632V-ZC, 32LF6509-ZB, 32LF650V-ZA, 32LF650V-ZB, 32LF652V-ZB, 32LF653V-ZC, 40LF6309-ZA, 40LF630V-ZA, 40LF6319-ZB, 40LF631V-ZB, 40LF6329-ZC, 40LF632V-ZC, 40LF634V-ZC, 42LF650V-ZA, 42LF650V-ZB, 42LF6529-ZA, 42LF652V-ZA, 42LF652V-ZB, 42LF653V-ZC, 43LF6309-ZA, 43LF630V-ZA, 43LF6319-ZB, 43LF631V-ZB, 43LF6329-ZC, 43LF632V-ZC, 43LF634V-ZC, 49LF6309-ZA, 49LF630V-ZA, 49LF6319-ZB, 49LF631V-ZB, 49LF6329-ZC, 49LF632V-ZC, 49LF634V-ZC, 49LF640V-ZD, 50LF650V-ZA, 50LF650V-ZB, 50LF6529-ZA, 50LF652V-ZA, 50LF653V-ZC, 55EG9109-ZB, 55EG910V-ZB, 55EG9A7V-ZB, 55LF6309-ZA, 55LF630V-ZA, 55LF6319-ZB, 55LF631V-ZB, 55LF6329-ZC, 55LF632V-ZC, 55LF640V-ZD, 55LF650V-ZA, 55LF650V-ZB, 55LF6529-ZA, 55LF652V-ZA, 55LF653V-ZC.

Manuals and User Manuals:
Document Language Date Size
Quick Start Guide English - English,Estonian,Latvian,Lettish,Lithuanian,Russian 05.19.2016 30911K
Quick Start Guide English - English,Estonian,Latvian,Lettish,Lithuanian,Russian 05.19.2016 No data
User manuals English 09/10/2015 3 270K

You can download the files for the 42LF650V model from the manufacturer's website.


LG 42LF650V 42" (107cm) diagonal 16:9 TV with LC420DUH (MG) (P1) LCD screen. In the LCD-panel the principle of direct display backlighting with a rear arrangement of LEDs - Direct LED is implemented.
There is support of 3D image using passive polarization technology.
The LC420DUH matrix and MainBoard software EAX66207203 provide for viewing shows and movies in high quality HD at 1920x1080 pixels in 1080p (Full HD) resolution.
The 42LF650V has built-in SMART software and webOS operating system. Connection to the network can be made via wireless Wi-Fi connection. Input analog video signal is decoded in PAL, SECAM, NTSC systems. Graphic processing of a digital signal is done in 480i, 480p, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA, MPEG4, HEVC (H.265), DivX, MKV, JPEG.
The sound system capacity of 20 W (2x10 W) is provided by two speakers. NICAM stereo sound processing system and Sound Surround surround function are used.
Communication with other devices via an external interface is supported by standard input and output connectors: Antenna input (RF), AV, component, HDMI x3, USB x3, Ethernet (RJ-45), Bluetooth, Wi-Fi, WiDi, Miracast. There is a headphone jack. There is a VGA (D-Sub 15) connector to connect a computer or laptop to this TV model. This interface supports standard resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768, 1920x1080. The digital tuner is able to receive TV channels in the standards DVB-T, DVB-T2, DVB-C, DVB-S2.

The TV uses EAX66203001 power supply.

Warning. Panel LC420DUH LED-TV LG 42LF650V is an expensive and unreliable element of it.
Do not allow any impact on the glass and pressure on the surface of the screen to avoid damage to the LED-panel!
Also it is not safe to get liquid on the screen. Sometimes one drop is enough if it drips down the glass onto the cables and the TV becomes unrepairable.