REPAIRING / SERVICING TV LG 32LF551C

 
Technical description and composition of LG 32LF551C TV, type of panel and modules used. Module composition.
Composition
Specifications
LG 32LF551C
LCD TV LED 32LF551C | Year of manufacture: 2015
Screen diagonal: 32" (81 cm)
Screen format: 16:9
Resolution: 1366x768
Refresh rate:     50 Hz
LED backlight: Yes, Direct LED
Support HD: 720p 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, 1080p
Multimedia: MP3, WMA, MPEG4, DivX, MKV, JPEG
Sound stereo: there is
Sound Power: 10W (2x5W)
Acoustics: two speakers
Interface: AV, Component, HDMI x2, USB
Find out more...
LG 32LF551C

LG LED
Model: 32LF551C

Chassis/Version: LB56H

Panel: NC320DXN VSBP8

LED driver (backlight): integrated into PSU

PWM LED driver: BD559

MOSFET LED driver: 5N41

Power Supply (PSU): EAX66171501 (2.1) LGP32D-15CH1

PWM Power: SSC3S111

MOSFET Power: MDF11N65B

MainBoard: EAX66203805 (1.2)

IC MainBoard: CPU: LGE2136, SPI Flash: MX25L8035EM2I, EEPROM: 24C256, Audio: TAS5733

TP: TDJM-G301D
General recommendations for LCD LED TV repair
Possible problems

- LG 32LF551C TV does not turn on, does not respond to the remote and control panel buttons, the indicators are not lit or blinking.

With such manifestations, in some cases the power module EAX66171501 is defective. It is necessary to measure its output supply voltages, and in their absence check the serviceability of the power switches (MDF11N65B) converters and rectifier diodes on the probability of breakdown in the semiconductor PN-junctions.
If the semiconductors in the secondary circuits breakdown, the inverter can usually be short-circuited accidentally, and the mains fuse is often blown when the power elements in the primary circuit are shorted.
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) SSC3S111, if there is no external damage and short circuit between the pins, check by replacing with a known good.

- No picture, but there is sound and all other functions work. Sometimes image appears for a second and then disappears.

Failure in the majority of such cases is detected in the nodes and elements of LED panel backlight. The cause can be found in the failure of LEDs, in violation of the contact between the LED strips, 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 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, its regulator will either be broken or it will be short-circuited.

If the LG 32LF551C has no picture but has sound, often the NC320DXN VSBP8 display backlight is just not working. And, in LED TVs, the LEDs inside the panel usually fail, 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 NC320DXN - 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 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 MainBoard EAX66203805 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 by oscilloscope the LVDS signals from MainBoard EAX66203805, 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 there is no significant damage in the cables and panel strips.

- The LED blinks or lights constantly, the TV set doesn't turn on, the remote control doesn't respond.

Repair or diagnosis of the motherboard EAX66203805 should begin with a check of the stabilizers and power converters needed to power the chips and matrix. If necessary, software (software) should be updated or replaced. 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: LGE2136, SPI Flash: MX25L8035EM2I, EEPROM: 24C256, Audio: TAS5733. Faulty BGA chips are usually easy to detect by warming them up.

If the TV set works fine with external devices but does not tune to the TV channels the TDJM-G301D tuner might be malfunctioning. In these cases you should first make sure that there is power 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 tuner malfunction.

To owners of a 32LF551C TV I recommend you to apply for repair only to a qualified specialist with the necessary experience! Attempting to repair yourself without the necessary knowledge and skills can lead to irreversible negative consequences!

DOWNLOAD SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>  LG 32LF551C Chassis LB56H.

 After repair of the backlight EAX66171501, BD559. Information from the master.

Decrease backlight current from 180 mA to 110 mA - replace R816 2.3 Ohm resistor at the source of converter key (current sensor) on EAX66171501 power supply board.
Driver current limitation. EAX66171501. General information.

To reduce the backlight current in LG TV's with the EAX66171501 (LGP32D-15CH1) power supply, you can increase the R816 2.3 Ohm current sensor resistance to 3 or 3.3 Ohm. The backlight current will decrease proportionally from the default 250mA to 200 or 180 mA respectively.
EAX66171501 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 MainBoard EAX66203805 is shown in the illustration below:

EAX66203805

The EAX66203805 can be used in televisions:

LG 32LF564U (Panel LC320DXE (MG)(A3)), LG 42LF550V (Panel LC420DUE (MG)(A6)), LG 32LF560U ZB (Panel NC320DXN VSBP5 ), LG 42LF560V (Panel LC420DUE (MG)(A3)), LG 32LF562V (Panel NC320DUN-VBBP3 (EAJ63171201)), LG 32LF564V (Panel NC320DUN VBBP3), LG 32LF560V (Panel NC320DUN-VBBP3), LG 49LF620V 49LF620V-ZB (Panel LC490DUE (MG)(P2)), LG 42LF551C (Panel LC420DUE-MGA6).

Power Supply Unit Exterior

EAX66171501:

EAX66171501.

Main features of the LG 32LF551C:

NC320DXN VSBP8 matrix (LED panel) is installed.
To power the backlight LEDs a converter, combined with a power supply, controlled by PWM controller BD559 is used. As the power elements of the LED-driver are used switches type 5N41.
Necessary supply voltages for all LG 32LF551C TV sets are generated by the power module EAX66171501 or its analogues using SSC3S111 chips and MDF11N65B type power keys.
MainBoard - the main board (motherboard) is a module EAX66203805, using chips CPU: LGE2136, SPI Flash: MX25L8035EM2I, EEPROM: 24C256, Audio: TAS5733 and others.
The TDJM-G301D tuner provides TV program reception and channel tuning.


Instructions and updates

Last update (firmware) - latest firmware Software File Version 03.05.37
Software_File_(Version_03.05.37).zip. From 12/11/2015, size 57713K
Software_Upgrade_Guide(Italy).pdf. From 12/11/2015, size 653K

Update (firmware) to models: 28LF551C-ZA, 32LF510B-ZB, 32LF510U-ZB, 32LF550U-ZA, 32LF551C-ZA, 32LF560U-ZB, 32LF560V-ZB, 32LF5610-ZF, 32LF561V-ZF, 32LF562U-ZC, 32LF562V-ZC, 32LF564U-ZH, 32LF564V-ZH, 32LF620U-ZB, 40LF570V-ZA, 42LF550V-ZA, 42LF551C-ZA, 42LF560V-ZB, 42LF5610-ZF, 42LF561V-ZF, 42LF562V-ZC, 42LF564V-ZH, 42LF620V-ZB, 43LF5100-ZA, 43LF510V-ZA, 43LF5400-ZB, 43LF540V-ZB, 43LF570V-ZA, 49LF5100-ZA, 49LF510V-ZA, 49LF5400-ZB, 49LF540V-ZB, 49LF550V-ZA, 49LF551C-ZA, 49LF620V-ZB, 50LF5610-ZF, 50LF561V-ZF, 55LF5610-ZF, 55LF561V-ZF.

You can download the files from the manufacturer's website for the 32LF510B model.

LG 32LF551C TV with LCD NC320DXN VSBP8, 32" (81 cm) diagonal in 16:9 aspect ratio. The LCD panel implements the principle of direct backlighting of the display with the rear arrangement of LEDs - Direct LED.
NC320DXN matrix and MainBoard software EAX66203805 provide high quality HD viewing at 1366x768 pixels in 720p (HD Ready) resolution. Input analog video signal is decoded in PAL, SECAM, NTSC systems. Graphic processing of a digital signal is done in 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA, MPEG4, DivX, MKV, JPEG.
The speaker system sound power of 10W (2x5W) is provided by two speakers. NICAM STEREO audio processing system is used.
Communication with other devices via an external interface is supported by standard inputs and outputs: antenna input (RF), AV, component, HDMI x2, USB. A VGA (D-Sub 15) connector is provided to connect a computer or laptop to this TV model. This interface supports standard resolutions: 640x480, 800x600, 1024x768, 1360x768. The digital tuner is capable of receiving TV channels in DVB-T, DVB-T2, DVB-C standards.

The TV set has the EAX66171501 power supply.

Dimensions: C stand 1122x712x237 mm, without stand 1122x660x55 mm.

Warning. The NC320DXN is an expensive and fragile part of your LG 32LF551C LED TV.
Do not allow any kind of impact on the glass and pressure on the screen surface to avoid damaging the LED panel!
It is also 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 LG 24LH480U

 Technical description and composition of LG 24LH480U TV, type of panel and modules used. Module composition.
Composition
Specifications
LG 24LH480U
Smart TV 24LH480U | Year of manufacture: 2016
Screen diagonal: 24" (61 cm)
Screen format: 16:9
Resolution: 1366x768
Frequency refresh rate:     50Hz
LED backlight: yes, Edge LED
Smart: yes. Wi-Fi support: yes
Support HD: 720p HD
Progressive scan: Yes
Digital tuner: DVB-T, DVB-T2, DVB-C
Teletext: Yes
Multimedia: MP3, MPEG4, JPEG
Sound stereo: there is
Sound Power: 10W (2x5W)
Acoustics: two speakers
Interface: HDMI x2, USB x2, Ethernet (RJ-45), Wi-Fi
Dimensions: With stand 556x388x130mm
Without stand 556x345x53mm
Find out more...
LG 24LH480U

LG LED
Model: 24LH480U - PZ

Chassis/Version: LU52A

Panel: V236BJ1-LE2

LED backlight: 6202B0005S000

LED driver (backlight): integrated into MainBoard

PWM LED driver: DT1641AS

MOSFET LED driver: TO-252

Power Supply (PSU): 19v Adapter

MainBoard: EAX66586404 (1.0) . EBR82930403

IC MainBoard: CPU, eMMC, DRAM, AUDIO, DC/DC

MainBoard: TDJM-G301D
General advice about LCD LED TV repair
Possible flaws

- LG 24LH480U does not turn on or shows no signs of working at all. Does not blink on indicators and does not respond to control buttons.

In some of these cases the main switching power supply - the Adapter module - is defective.
The TV is equipped with an external 19v Adapter type power supply. Owners of the TV can check them by replacing them and buy them in stores, but the ability to open and fix typical defects usually does not create difficulties for the master. 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 and rectifier diodes of converters for possible short circuits.
At breakdown of semiconductors in the secondary circuits of any converter, as a rule, it can work in the emergency short-circuit mode without output voltages, and at short circuit in the elements of the primary circuit the mains fuse and more rarely the current sensor at the source of the key most often break down at once.
Mos-Fet power switches used in switched-mode power supplies sometimes fail due to the failure of some other element that can take it out of key mode, or cause the switch to exceed its maximum allowable parameters. 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.

If the LG 24LH480U has no picture but has sound, often the V236BJ1-LE2 display backlight is just not working. Moreover, in LED TVs usually fail the 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 V236BJ1-LE2 - a process that requires 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

If there is no image, but backlighting works - the screen becomes slightly lighter when the TV is switched 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 EAX66586404 is defective, and software failure is also possible.
Then first it is necessary to check the panel 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 the LVDS signals from MainBoard EAX66586404, 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 there was not significant damage in the cables and panel bars.

- No picture, sound is present and all other TV functions work. When turning on, the picture can sometimes appear for a second.

As a rule, in this case it turns out that the LED panel backlight is defective. Usually the cause of the fault is a breakage in the LEDs, or in the connectors of the LED strips, but sometimes the LED-driver is also faulty.
It should be remembered that to determine the breakage in the lines of LEDs without disassembling the panel, with a tester or multimeter is not possible without an additional device, such as a current source. To open all the PN-junctions connected in series at once a voltage of several tens of volts may be required. Then you have to open the panel and check each LED separately with a multimeter. If the possibilities of your multimeter do not allow to open the LED in the forward direction or twin LEd's are used, then the PN junction of the faulty stabilizer can indirectly serve as an indication of serviceability. If the LED is faulty, the PN junction of the stabilizer will either be open or shorted.

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

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

Repair or diagnosis of the motherboard EAX66586404 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 elements of MainBoard - CPU, eMMC, DRAM, AUDIO, DC/DC need checking or replacement (if necessary). If a BGA processor is used, its failure is usually detected by local heating.

Before replacing the TDJM-G301D tuner if you cannot tune to the TV channels, make sure the supply voltages are present and measure at the respective pins of the tuner and check the software for correctness. The tuner-to-processor communication pulses can be checked with an oscilloscope

To the users and owners of TV sets it is necessary to remember that attempting to repair LG 24LH480U TV set itself without the relevant qualification and necessary experience, can lead to serious negative consequences!

DOWNLOAD SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>    LG 24LH480U Chassis LU52A.

 Refinement after the repair of the backlight. EAX66586404, DT1641AS. Information from the master.

Decreased backlight current from 180 mA to 120 mA - increased the rating of one of the resistors (R1025) from pin 7 of ISET chip DT1641AS from 24 to 43 kOhm on board EAX66586404.
More on MainBoard Repair

The MainBoard EAX66586404 is shown in the figure below:

EAX66586404.

Main features of the LG 24LH480U:

A matrix (LED panel) V236BJ1-LE2 is installed.
To power the LED backlight is used converter, combined with the main board EAX66586404, controlled by PWM controller DT1641AS. As the power elements of the LED-driver switches of TO-252 type are used.
To power all the internal components of LG 24LH480U TV set an external power supply of Adapter 19v type is used.
MainBoard - the main board (motherboard) is EAX66586404 module using CPU, eMMC, DRAM, AUDIO, DC/DC and other chips.
The TDJM-G301D tuner provides TV program reception and channel tuning.

More technical information about the panel:
Brand : CHIMEI INNOLUX
Model : V236BJ1-LE2
Type : A-Si TFT-LCD, Panel
Diagonal size : 23.6 inch
Resolution : 1366x768, WXGA
Display Mode : Super MVA, Normally Black, Transmissive
Active Area : 521.471x293.184 mm
Surface : Antiglare (Haze 1%), Hard coating (3H)
Brightness : 250 cd/m²
Contrast Ratio : 3000:1
Display Colors : 16.7M (8-bit), CIE1931 72%
Response Time : 8.5 (G to G)
Frequency : 60Hz
Lamp Type : WLED Without Driver
Signal Interface : LVDS (1 ch, 8-bit), 30 pins
Voltage : 12.0V

LG 24LH480U TV with V236BJ1-LE2 LCD display, measuring 24" (61 cm) diagonally in 16:9 aspect ratio. This model uses a panel with an end arrangement of LEDs in the display backlight - Edge LED.
V236BJ1-LE2 matrix and MainBoard software EAX66586404 provide high quality HD viewing at a resolution of 1366x768 pixels in 720p (HD Ready).
The 24LH480U features SMART software, built-in applications and Internet connectivity. You can connect to the network using Wi-Fi wireless connectivity. Supported media formats: MP3, MPEG4, JPEG.
The speaker system has a sound power of 10 W (2x5 W) provided by two speakers. It uses NICAM stereo sound processing and Sound Surround surround function.
Communication with other devices via an external interface is supported by standard input and output connectors: antenna input (RF), HDMI x2, USB x2, Ethernet (RJ-45), Wi-Fi. The digital tuner is capable of receiving TV channels in the DVB-T, DVB-T2, DVB-C standards.

The TV uses an external power supply Adapter 19v.

Dimensions: C stand 556x388x130 mm, without stand 556x345x53 mm.

Warning. The V236BJ1-LE2 LED TV panel of LG 24LH480U is an expensive and unreliable part of the TV.
Avoid any kind of impact on the glass and 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-LED32S95T2

 Technical description and composition of the TELEFUNKEN TF-LED32S95T2 TV, type of panel and modules used. Module composition.
Composition
Specifications
TELEFUNKEN TF-LED32S95T2
LCD TV LED TF-LED32S95T2 | Year of manufacture: 2019
Screen diagonal: 31.5" (80 cm)
Aspect ratio: 16:9
Resolution: 1366x768
LED backlight: Yes
Support HD: 720p HD
Brightness: 220 cd/m2
Contrast: 3000:1
Viewing Angle: 160°
Pixel response time: 10 ms
Progressive scan: Yes
Digital tuner: DVB-T, DVB-T2, DVB-C
Number of channels: 600
Teletext: there is
Multimedia: MP3, WMA, DivX, MKV, JPEG
Sound stereo: there is
Sound power: 16W (2x8W)
Acoustics: two speakers
Interface: AV, HDMI x2, USB
Headphone jack: yes
TV weight:     3.6 kg
Dimensions: with stand 735x475x185 mm
without stand 735x435x75mm
Find out more...
TELEFUNKEN TF-LED32S95T2

TELEFUNKEN LED
Model: TF-LED32S95T2

Chassis/Version: MS36639-ZC01-01

Panel: V320BJ8-Q01-C1

LED driver (backlight): integrated into MainBoard

PWM LED driver: OB3350CP

MOSFET LED driver: TO-252

Power Supply (PSU): integrated into MainBoard

PWM Power: PWM SOT23-6

MOSFET Power: TO-252

MainBoard: MS36639-ZC01-01

IC MainBoard: SPI Flash: 25Q64CSG

MainBoard: DVB-T2 & SAT
General advice about LCD LED TV repair
Possible problems

- TELEFUNKEN TF-LED32S95T2 does not turn on, indicators on the front panel are not glowing or blinking. TV set doesn`t respond on remote control.

The problem in such cases should be looked for in the elements of power supply source - AC/DC converter, which is located on the MainBoard MS36639-ZC01-01. You should measure its output voltages and, in case of their absence, check the power switches (TO-252) and the 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. There are no output voltages in this case. 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.
Breakdown of power switches (MosFet) in pulse sources is sometimes caused by faults in other circuit elements, for example, in the circuits supplying 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, there is, the remote control responds. Or just after switching on for a second the image can appear and then disappear.

Often in such cases there is no backlighting of the LED panel. Often the cause is a faulty LED (breakage, short circuit, etc.), or connectors of the bars (strings), less often faulty is the LED-driver.
It is impossible to check LED strips for breakage without disassembling the panel using multimeter or tester. For this purpose, you need to open all the series-connected PN-junctions and will need a voltage of about tens of volts, and ideally - a current source. Having disassembled the panel, it is necessary to check each LED separately. Chinese multimeters tend to light up a single 3 volt LED slightly in the forward direction. In the case of twin 6 volt LEDs, the PN junction of its safety regulator may be a good indicator. In faulty LEDs the regulator will either be open or broken in the short circuit.

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

- The TV does not turn on, the LED indicates standby or operation mode, or blinks.

Repair or diagnosis of the motherboard MS36639-ZC01-01 should begin with checking 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 that are hard to detect. If you try to repair it, check its elements - SPI Flash: 25Q64CSG and replace faulty chips 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.

Before replacing the DVB-T2 & SAT tuner, if there is no tuning to the channels, you must first check the software and the supply voltage on its pins. Also make sure that the tuner and the processor can communicate via the I2C bus.

Warning to the users! Self repair of your TELEFUNKEN TF-LED32S95T2 without proper skill and experience may result in its complete unrepairable condition.



Finishing up after repairing the backlight. MS36639-ZC01-01, OB3350CP. Information from the master.

Reduce backlight current from 560 mA to 350 mA - removed one of the 1.5 Ohm resistors (PR56) in the current sensor (PR55-PR57) of the driver board MS36639-ZC01-01.

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

 
More on MainBoard Repair

The appearance of the MainBoard MS36639-ZC01-01 is shown in the figure below:

MS36639-ZC01-01

Main features of the TELEFUNKEN TF-LED32S95T2:

A matrix (LED panel) V320BJ8-Q01-C1 is installed.
A converter, combined with the main board MS36639-ZC01-01, controlled by the PWM controller OB3350CP, is used to power the backlight LEDs. As the 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 - motherboard is MS36639-ZC01-01 module, with SPI Flash chips: 25Q64CSG and others.
The DVB-T2 & SAT tuner allows you to receive TV programs and tune to channels.

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

 

TELEFUNKEN TF-LED32S95T2 TV with V320BJ8-Q01-C1 LCD screen measuring 31.5" (80 cm) diagonally in 16:9 aspect ratio. 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.
V320BJ8-Q01-C1 matrix and software MainBoard MS36639-ZC01-01 implement HD image quality at a resolution of 1366x768 pixels in the standard 720p (HD Ready). Supported formats of multimedia files: MP3, WMA, 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 with other devices) is supported by standard inputs and outputs: antenna input (RF), AV, HDMI x2, USB. 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: with stand 735x475x185 mm, without stand 735x435x75 mm.

TV weight: 3.6 kg.

Warning. The V320BJ8-Q01-C1 is an expensive and fragile part of your TELEFUNKEN TF-LED32S95T2 LED TV.
Avoid any kind of impact on the glass and pressure on the surface of the screen 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-LED32S43T2

Technical description and composition of the TELEFUNKEN TF-LED32S43T2 TV, type of panel and modules used. Module composition.
Composition
Specifications
TELEFUNKEN TF-LED32S43T2
LCD TV LED TF-LED32S43T2 | Year of manufacture: 2017
Screen diagonal: 31.5" (80 cm)
Aspect ratio: 16:9
Resolution: 1366x768
Refresh rate:     50Hz
LCD panel type: LSC320AN09
LED backlight: Yes
Support HD: 720p HD
Brightness: 220 cd/m2
Contrast: 5000:1
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: AV, component, VGA, HDMI x3, USB
Headphone jack: yes
Find out more...
TELEFUNKEN TF-LED32S43T2

TELEFUNKEN LED
Model: TF-LED32S43T2

Chassis/Version: TP.MS3463S.PB801

Panel: HK315LEDM-MHXMH

LED backlight: CUW JHSP 3528 3V 1.5W 131LM 500mA

LED driver (backlight): integrated into MainBoard

PWM LED driver: SN51DP

MOSFET LED driver: AOD458 TO-252

Power Supply (PSU): integrated into MainBoard

PWM Power: PWM SOT23-6

MOSFET Power: TO-220

MainBoard: TP.MS3463S.PB801

IC MainBoard: CPU: MSD3463GU, SPI Flash: GD25Q64, AUDIO: OB6220VP

TP: XF-3SDT-H
General advice about LCD LED TV repair
Possible defects

- TELEFUNKEN TF-LED32S43T2 will not turn on or show any signs of functionality. It doesn't blink and doesn't respond to the control buttons.

In this case the main AC/DC converter, which is located on the MainBoard TP.MS3463S.PB801, may be defective. You should measure its output voltages and if not, check the functionality of the power switches (TO-220) and the rectifier diodes in the converters for possible breakdown.
If there is a breakdown in the secondary circuits, the inverter can usually be short-circuited, and if there is a short in the power elements of the primary circuit, 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 supplying the PWM controller, the damping or frequency-retaining circuits, or the negative feedback elements in the stabilization circuit. PWM controllers (PWM) PWM SOT23-6, if there are no external damages and short circuits between pins, are checked by replacing with known good ones.

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

In some of these cases malfunction is caused by the lack of backlighting of the display. Often the cause of the fault is the lack of current in the LED circuit, such as their breakage or short circuit, or a violation of the connector pins CUW JHSP 3528 3V 1,5W 131LM 500mA .
It should be remembered that to determine the breakage in the LED strips without disassembling the panel, using a tester or multimeter is not possible without an additional device, such as a current source. To open all the PN-junctions connected in series at once a voltage of several tens of volts may be required. Then you have to open the panel and check each LED separately with a multimeter. If the capabilities of your multimeter do not allow to open the LED in the forward direction or twin LEd's are used, then the PN junction of the faulty stabilizer can indirectly serve as an indication of serviceability. If the LED is faulty, the PN junction of the stabilizer will either be open or short-circuited.

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

- The TV set does not enter the operation mode, the remote control is not responding. Front panel LED is either on continuously or is blinking.

Repair or diagnostic of the TP.MS3463S.PB801 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). In cases of complex repairs of MB (SSB) and with the necessary skills and equipment sometimes it may be necessary to replace its chips CPU: MSD3463GU, SPI Flash: GD25Q64, AUDIO: OB6220VP and other possible defective components. Faults related to the use of BGA soldering technology are usually easily diagnosed by the heating method.

If there is no TV channel reception, but your TV works fine with external devices, the first thing to do is to check the XF-3SDT-H tuner supply voltage and update the software. Check the I2C communication pulses with an oscilloscope.

Once again, users need to be reminded! Trying to repair your TELEFUNKEN TF-LED32S43T2 without proper skill and experience may result in its total uselessness!

DOWNLOAD SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>   Chassis TP.MS3463S.PB801.

 Refinement after the repair of the backlight. TP.MS3463S.PB801, SN51DP. Information from the master.

Reduce backlight current from 290 mA to 210 mA - removed one of the resistors (2.2 Ohm) in the driver current sensor on the TP.MS3463S.PB801 board. The sensor resistors are under the DB801 diode.
More on MainBoard repair

The appearance of the MainBoard TP.MS3463S.PB801 is shown in the figure below:

TP.MS3463S.PB801

The TP.MS3463S.PB801 can be used in TV sets:

AKAI LEA-40V35M (Panel LSC400HM06), AKIRA 32LED38T2P (Panel ST3151A05-8), AKIRA 32LED02T2M (Panel ST3151A04-9 Ver.2.1), BBK 32LEM-1029/TS2C (Panel C320X16-E18-H), BBK 39LEM-1033/TS2C (Panel C390X15-E8-A G01), BBK 32LEM-1026/TS2C (Panel CX315DLEDM ST3151A05-8), BBK 32LEM-1027/TS2C (Panel ST3151A05-8 / CX315DLEDM), DEXP F43C7100K (Panel LC430DUY (SH)(A1)), DEXP F42B7000M (Panel V420HJ2-P01), DEXP F43C7000C (Panel C430F14-E1-L / LC430DUY), DEXP F40B7100K (Panel LSC400HN02-G02 40N06-L-HPX1F1), DEXP H28C7100C (Panel C275X15-E1-H (G31)), DEXP H32C7300K (Panel LSC320AN02), DEXP H32D7100C (Panel ST3151A05-8 Ver2.5), DEXP H28D7300K (Panel HV280WX2-260), ERISSON 32LES78T2W (Panel KM0320LDRH0037), ERISSON 32LEE30T2 (Panel LK315T3HB87-12V), SUPRA STV-LC32T560WL (Panel LSC320AN10), SUPRA STV-LC32T550WL (Panel LSC320AN02), SUPRA STV-LC40T500WL (Panel C39X15-E7-A), TELEFUNKEN TF-LED32S45T2 (Panel LK315T3HB87-12V), THOMSON T39D20DH-01B (Panel T390XVN01.0).

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 TELEFUNKEN TF-LED32S43T2:

HK315LEDM-MHXMH matrix (LED panel) is installed.
A converter, combined with the main board TP.MS3463S.PB801, controlled by the SN51DP PWM controller, is used to power the backlight LEDs. AOD458 TO-252 type switches are used as power elements of the LED driver.
The power module is combined with MainBoard and is designed as reverse-going AC/DC converter with PWM SOT23-6 chips and TO-220 type power switches.
MainBoard - the main board (motherboard) is a TP.MS3463S.PB801 module, with the usage of CPU: MSD3463GU, SPI Flash: GD25Q64, AUDIO: OB6220VP and other microchips.
The XF-3SDT-H tuner provides TV program reception and channel tuning.

TELEFUNKEN TF-LED32S43T2 TV with LCD LSC320AN09, 31.5" (80 cm) diagonal in 16:9 aspect ratio. The screen luminance of 220 cd/m² is provided by the LED backlight. Contrast, as the ratio of maximum brightness to minimum brightness, is 5000:1. The screen technology of this TV model features LED backlighting.
Matrix LSC320AN09 and MainBoard software TP.MS3463S.PB801 implement HD image quality at a resolution of 1366x768 pixels in 720p (HD Ready). 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), AV, component, VGA, HDMI x3, USB. There is a headphone output. The digital tuner has DVB-T, DVB-T2, DVB-C standard.

MainBoard power supply is used.

Warning. The panel LSC320AN09 of your TELEFUNKEN TF-LED32S43T2 LED TV is an expensive and unreliable component.
Do not apply any impact on the glass and do not exert any pressure on the screen surface to avoid damaging your 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-LED32S30T2

Technical description and composition of the TELEFUNKEN TF-LED32S30T2 TV, type of panel and modules used. Module composition.
Composition Specifications
TELEFUNKEN TF-LED32S30T2
LCD TV LED TF-LED32S30T2 |

 Year of manufacture: 2014
Screen diagonal: 31.5" (80 cm)
Screen Format: 16:9
Resolution: 1366x768
Refresh rate:     50Hz
LCD panel type: CX315DLEDM
LED backlight: LED Edge LED
Support HD: 720p HD
Brightness: 250 cd/m2
Contrast: 2400:1
Viewing Angle: 178°
Pixel response time: 8 ms
Progressive scan: Yes
TV Standards: PAL, SECAM, NTSC
Digital tuner: DVB-T, DVB-T2, DVB-C
Number of channels: 1100
Teletext: 1000 page memory.
DTV formats: 480i, 480p, 576i, 576p, 720p, 1080i, 1080p
Multimedia: MP3, WMA, MPEG4, Xvid, DivX, MKV, JPEG
Audio Stereo: Yes
Sound power: 6W (2x3W)
Acoustics: two speakers
Interface: AV, audio x2, component, VGA, HDMI, USB
Headphone jack: yes
TV weight:     3.5 kg
Dimensions: with stand 729x469x168mm
without stand 729x429x76 mm
Find out more...
TELEFUNKEN TF-LED32S30T2

TELEFUNKEN LED
Model: TF-LED32S30T2

Chassis/Version: CV512H-U42

Panel: CX315DLEDM LE-32Z2

LED driver (backlight): integrated into MainBoard

PWM LED driver: BIT3267

MOSFET LED driver: ME15N10 TO-252

Power Supply (PSU): integrated into MainBoard

PWM Power: PWM SOT23-6

MOSFET Power: TO-252

MainBoard: CV512H-U42

MainBoard IC: SPI Flash: W25Q64, Audio: RDA3118E28 (TPA3110D)

MainBoard: CDT-9NT372-RD60
General recommendations for LCD LED TV repair
Possible trouble spots

- The TELEFUNKEN TF-LED32S30T2 TV set does not turn on or does not respond to the remote control.

In this case the failure may be the main power supply - AC/DC converter, elements of which in this model are located on the common 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 breakdown of semiconductors in the secondary circuits of any converter, as a rule, it can operate in the short-circuit emergency mode without output voltages, and at short circuit in the elements of the primary circuit most often the line fuse and more rarely the current sensor in the source of the key break immediately.
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 present and all other TV functions are working. When turned on, the picture may sometimes appear for a second.

In some of these cases, the malfunction is caused by the lack of display backlighting. The reason for this may be a break in the circuit of the LEDs, or a problem in the stabilization of their power supply.
Without a special current source it is impossible to check the line of LEDs in series, and it is not safe for them 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 a good indicator. If the LED is faulty, its regulator will either be broken or it will be short-circuited.

If TELEFUNKEN TF-LED32S30T2 has no picture but you have sound, often the backlight of the CX315DLEDM display simply does not work. Moreover, in LED-TVs, usually the LEDs inside the panel fail, 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.


- The LED blinks or lights constantly, the TV set does not turn on, the remote control does not respond.

Repair or diagnosis of the motherboard CV512H-U42 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. If there is no possibility of replacing the MB board (SSB), you should check the serviceability of its elements - SPI Flash: W25Q64, Audio: RDA3118E28 (TPA3110D). Defective components should be replaced.

Before replacing the CDT-9NT372-RD60 tuner, if there is no tuning to the channels, first check the software and the power supply voltages on its outputs. Also make sure that the tuner and the processor can exchange data via the I2C bus.

Once again I  would like to remind the users! Trying to repair your TELEFUNKEN TF-LED32S30T2 without proper skill and experience may make your TV completely unrepairable.


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

Refinement after repair of the backlight. CV512H-U42, BIT3267. Information from the master.

Reduce backlight current from 300 mA to 210 mA - removed one 1.0 Ohm resistor in the backlight current sensor (PR182, PR183, R203, PR238) on the CV512H-U42 board.
Driver current limitation. CV512H-U42, BIT3267S. General Information.

To reduce the backlight current in LED drivers with the BIT3267 controller you have to increase the total resistance of the low resistance current sensor resistors Rset, connected to pin 5 INN of the BIT3267 chip. Usually the LED backlight connector is connected to these.
The total resistance RLed 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.

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

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

Many TV manufacturers are now installing a questionable thermal rating for the backlight LEDs, which has a negative effect on the longevity of the device. In half of the cases, LEDs fail after 2-3 years of operation due to overheating, usually seen by the destroyed phosphor on the body of the LEDs. The warranty period, as a rule, the LEDs still have time to work out.

Even if the maximum allowable current is within specifications the cooling of LEDs is not always sufficiently efficient, which can be seen by the traces of overheating, i.e. dark spots on textolite slats on the back side. And modern LED televisions use diodes with an external phosphor coating, which after a year or two crumbles and the crystal directly shines purple. How such a source of ultraviolet radiation can harm the health of users, no one has yet thought.

Chinese manufacturers via Aliexpress supplies diodes and LED strips in kits of any assortment, but the lucky owner of the TV pays for them and for the repair.

After replacing one or more faulty LEDs, it is useful to look at the rest carefully, if the phosphor is cracked, it is advisable to replace all the LEDs. If you measure the voltage drop on overheated LEDs, it will be slightly higher than that of adjacent less worn or new LEDs, which indirectly indicates the presence of a parasitic active resistance (ESR). Further operation of such LEDs is even more questionable.

If you reduce the current in the diodes, the power dissipation and the real operating temperature will decrease, then there is a chance that the old ones will still work.

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.

 

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-LED32S30T2:

A CX315DLEDM LE-32Z2 matrix (LED panel) is installed.
To power the LED backlight is used converter, combined with the main board CV512H-U42, controlled by a PWM controller BIT3267. The ME15N10 TO-252 type switches are used as power elements of LED-driver.
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 CV512H-U42 module, using SPI Flash: W25Q64, Audio: RDA3118E28 (TPA3110D) and other microcircuits.
The CDT-9NT372-RD60 tuner provides TV program reception and channel tuning.

TELEFUNKEN TF-LED32S30T2 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 LED panel of this TV features Edge LED end illumination.
CX315DLEDM matrix and MainBoard CV512H-U42 software realize HD picture quality at 1366x768 pixels resolution in 720p (HD Ready) graphic decomposition standard. Input high frequency or video signal can be processed in PAL, SECAM, NTSC analog systems. Graphical processing and digital signal formation is performed in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA, MPEG4, Xvid, DivX, MKV, JPEG.
The speaker system has 6W (2x3W) sound power provided by 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, audio x2, component, VGA, HDMI, USB. 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, 1360x768. The digital tuner is able to receive DVB-T, DVB-T2, DVB-C TV channels.

It uses power supply as a part of 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-LED32S30T2 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.