REPAIRING / SERVICING TV PHILIPS 32PHS4132

Repair of PHILIPS 32PHS4132 TV set
Technical description and components of the TV set PHILIPS 32PHS4132, type of panel and modules used. Module composition.
PHILIPS LED
Model: 32PHS4132/60

Chassis/Version: TPN17.1E LA

Panel: TPT315B5-FHBN0.K

LED driver (backlight): integrated into PSU

PWM LED driver: PF7708BS

MOSFET LED driver: MTBA5N10J3

Power Supply (PSU): 715G7734-P01-005-002H

PWM Power: PF6005AS

MOSFET Power: TK6A65D

MainBoard: 715G8659-M01-000-004Y

IC MainBoard: CPU: NT72461, NAND: W29N01HVSINF, AUDIO: TAS5753MD

Тuner: TDSY-G430D

Possible Manifestations of Defects

- PHILIPS 32PHS4132 TV does not turn on, does not respond to the remote control and control panel buttons, the indicators are not lit or flashing.

Usually with such manifestations defect is caused by faulty elements in the main power module 715G7734. It is necessary to measure its output voltages, and in case of their absence (complete or partial), you should check the serviceability of the power keys (TK6A65D) converters and rectifier diodes for possible short circuit.
At breakdown of semiconductors in the secondary circuits of any converter, as a rule, it can work 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 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 (NF) stabilization circuits. PWM regulators PF6005AS, if they do not have visible housing damage and outright short circuit between pins, are usually checked by replacement.

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

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

Often in such cases there is no backlighting of the LED panel. The cause may be found in the failure of the LEDs, in violation of the contact connections of the LED strips, or in their power supply (LED-driver).
It is impossible to check the LED strips for breakage without disassembling the panel with a multimeter or a tester. For this purpose, you need to open all the PN-junctions connected in series 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. Faulty LEDs will either have a broken regulator or a short circuit.

If the PHILIPS 32PHS4132 has no picture but has sound, often the TPT315B5-FHBN0.K 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 TPT315B5-FHBN0.K - 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 do not have experience in LCD panel repair

If there is no image, but backlighting works - the screen becomes slightly 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 715G8659-M01-000-004Y is defective, also software failure is 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, you need to trace by oscilloscope the LVDS signals from MainBoard 715G8659-M01-000-004Y, 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 does not go into the operating mode, the remote control does not respond. Front panel LED's are either constantly on or blinking.

Repair or diagnostic of the motherboard 715G8659-M01-000-004Y should begin with checking the stabilizers and power converters necessary to power the chips and matrix. Software (software) should be updated or replaced if necessary. Sometimes elements of MainBoard should be checked or replaced (if necessary) - CPU: NT72461, NAND: W29N01HVSINF, AUDIO: TAS5753MD. If a BGA processor is used, its malfunction is usually detected by local heating.

Before replacing the TDSY-G430D tuner if you cannot tune to the TV channels, make sure the supply voltages are present and measure them on the respective pins of the tuner and check the software for correctness. The tuner-to-processor communication pulses can be checked with an oscilloscope

Please remember! Attempts to repair PHILIPS 32PHS4132 TV-set by yourself, in the absence of necessary qualification and experience are strongly not recommended and are fraught with negative consequences, up to the full unrepairability of the device!

DOWNLOAD SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------> PHILIPS 32PHS4032 Chassis TPN17.1E EU.

DOWNLOAD SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------> 22PFS4232/12, 43PFT4112/05, 22PFT4232/12, 43PFT4112/12, 32PFS4132/12, 24PFS4032/12, 32PFT4132/05, 24PFT4032/12, 32PFT4132/12, 24PFT4032/60, 32PFT4132/60, 24PHS4032/12, 32PHS4132/12, 24PHT4032/05, 32PHT4132/05, 24PHT4032/12, 32PHT4132/12, 24PHT4032/60, 32PHT4132/60, 32PHS4032/12, 43PFS4132/12, 32PHT4032/12, 43PFT4132/05, 32PHT4032/60, 43PFT4132/12, 22PFS4022/12, 43PFT4132/60, 22PFT4022/05, 49PFS4132/12, 22PFT4022/12, 49PFT4132/12, 22PFT4022/60, 32PHS4112/12, 24PFS4022/12, 32PHT4112/05, 24PFT4022/12, 32PHT4112/12, 24PFT4022/60, 39PHS4112/12, 24PHS4022/12, 39PHT4112/05, 24PHT4022/05, 39PHT4112/12, 24PHT4022/12, 43PFS4112/12. Chassis TPN17.1E EU



 Refinement after repair of the backlight. 715G7734-P01-005-002H, PF7708BS. Information from the master.

Reduce backlight current from 1 A to 800 mA - removed one of the resistors (R8653) in the LED driver current sensor on the power supply board 715G7734-P01-005-002H.
Driver current limitation. 715G7734, PF7708BS. General Information.

The driver chip is PF7708BS, the current sensor is five resistors R8652, R8653, R8654, R8655, R8656 connected pa in the LED current circuit on the 715G7734-xx-xx-xxx power supply board.
To reduce the backlight current you can remove one or two of the current sensor resistors in the 715G7734 power supply.
715G7734 current backlight

DOWNLOAD----------->  PDF document PF7708B is attached.

  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 715G8659-M01-000-004Y is shown in the figure below:

715G8659-M01-000-004Y

The main features of the PHILIPS 32PHS4132 device:

TPT315B5-FHBN0.K matrix (LED panel) is installed.
To power the LED backlight applied converter, combined with a power supply, controlled by PWM controller PF7708BS. As the power elements of LED-driver are used switches type MTBA5N10J3.
Required supply voltages for all PHILIPS 32PHS4132 TV assemblies are generated by power supply module

715G7734-P01-005-002H or its analogues using PF6005AS chips and TK6A65D type power keys.
MainBoard - the main board (motherboard) is a module 715G8659-M01-000-004Y, with the use of chips CPU: NT72461, NAND: W29N01HVSINF, AUDIO: TAS5753MD and others.
The TDSY-G430D tuner provides TV program reception and channel tuning.

Instructions and updates

Software update (firmware).

Version: 000.002.180.000 ZIP file, 42.3 MB November 10, 2020

Russian version.

Documentation:

Quick Start Guide PDF file, 1.6 MB December 1, 2017.

Brochure Version: 2.1.1 PDF file, 479.7 kB July 19, 2019

Operating instructions PDF file, 2.9 MB December 1, 2017.

Files can be downloaded from the manufacturer's website for the 32PHS4132/60 model.


TV PHILIPS 32PHS4132 with LCD TPT315B5-FHBN0.K, 31.5" (80 cm) diagonal size 16:9. The required brightness of 280 cd/m² screen is provided by an LED backlight. In the LCD-panel is implemented a backlight of Direct LEDs.
The TPT315B5-FHBN0.K matrix and MainBoard software 715G8659-M01-000-004Y enable high quality HD viewing at 1366x768 pixels in 720p (HD Ready). Supported media file formats are MP3, WMA, MPEG4, HEVC (H.265), MKV, JPEG.
The sound system capacity of 16 W (2x8 W) is provided by two speakers. NICAM stereo signal processing system and Sound Surround surround sound function are used.
External interface (connection with other devices) is supported by standard input and output connectors: antenna input (RF), HDMI x2, USB. There is a headphone output. The digital tuner can receive TV channels in the standards DVB-T, DVB-T2, DVB-C, DVB-S, DVB-S2.

The TV uses a power supply 715G7734-P01-005-002H.

Dimensions: with stand 727x479x185 mm, without stand 727x425x82 mm.

TV weight: with stand 4.85kg, without stand 4.8kg.

Warning. The panel TPT315B5-FHBN0.K of your PHILIPS 32PHS4132 LED TV is an expensive and unreliable part of it.
Avoid any kind of 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.

REPAIRING / SERVICING TV PHILIPS 40PFT4009

 Technical description and composition of the PHILIPS 40PFT4009 TV, type of panel and modules used. Module composition.

PHILIPS LED
Model: 40PFT4009/60

Chassis/version: TPN14.1E LA

Panel: TPT400LA-J6PE1 REV SC1L

LED driver (backlight): Built-in power supply

PWM LED driver: PF7708AS

MOSFET LED driver: CYS9240

Power supply (PSU): 715G6934-P0D-000-020

PWM power supply: PF6003AHS, AOZ3015AI

MOSFET power supply: TK8A65D

MainBoard: 715G6901-M0C-000-004T

IC MainBoard: CPU: NT72567BG, Audio: AD87588

Tuner: NT78822
General recommendations for LCD LED TV repair
Possible Manifestations of Defects

- PHILIPS 40PFT4009 does not turn on, indicators on the front panel are not glowing and not blinking. The TV does not respond to the remote control.

In some cases the power module 715G6934-POD-000-020 is defective with such manifestations. It is necessary to measure its output voltages and in case of their absence check the serviceability of the power keys (TK8A65D) and the rectifier diodes in the converters for the probable breakdown.
If the semiconductors in the secondary circuits breakdown, the inverter can usually be short-circuited, and the mains fuse often blows when the power elements in the primary circuit are shorted.
Breakdown of the Mos-Fet switches used in switching sources is often caused by faults in other elements, such as in the PWM controller supply circuit, in the frequency-retaining or damping circuits, and in the Negative Feedback Stabilization circuit. PWM microcircuits PF6003AHS, AOZ3015AI are usually checked by replacement with new or known good ones.

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

Usually in such cases there is no backlight of the LED panel (matrix). The cause can sometimes be in the power supply of LEDs, but more often in their failure (breakage or breakage), sometimes in violation of the contact connections of LED strips.
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 transitions, 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 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 PHILIPS 40PFT4009 has no picture but has sound, often the TPT400LA-J6PE1 REV SC1L display backlight 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 a faintly visible image when external light hits the screen.

To replace the LEDs requires disassembly of the LCD panel TPT400LA-J6PE1 - 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 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 715G6901-MOC-000-004T is defective, 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, you need to trace by oscilloscope the LVDS signals from MainBoard 715G6901-MOC-000-004T, as well as synchronizing signals to driver stubs.

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

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

Repair or diagnosis of the motherboard 715G6901-M0C-000-004T should begin with checking the stabilizers and power converters needed to power the chips and matrix. Software (software) should be updated or replaced if necessary. Sometimes elements of MainBoard must be checked or replaced (if necessary) - CPU: NT72567BG, Audio: AD87588. If a BGA processor is used, its malfunction is usually found by local heating.

Before replacing the NT78822 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. The tuner-to-processor communication pulses can be checked with an oscilloscope

Users and owners of TV sets should be aware that attempting to repair the PHILIPS 40PFT4009 without the necessary expertise and experience, can have seriously negative consequences!

DOWNLOAD SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------> PHILIPS 40PFT4009 Chassis TPN14.1E LA.

DOWNLOAD SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>   FOR MODELS:  20PHH4109/60, 22PFH4109/88, 22PFK4109/12, 22PFT4109/12, 22PFK4209/12, 23PHH4009/88, 23PHK4009/12, 23PHT4009/12, 23PHH4109/60, 24PHH4109/88, 24PHH4109/60, 24PHK4109/12, 24PHT4109/12, 24PHH5219/88, 24PHT5219/12, 28PHH4109/88, 32PHH4009/88, 32PHK4009/12, 32PHT4009/12, 32PHH4009/60, 32PFH4009/88, 32PFK4009/12, 32PFT4009/12, 32PHH4109/88, 32PFH4109/88, 32PFT4109/12, 32PHT4109/12, 32PHH4109/60, 32PFK4109/12, 32PHK4109/12, 32PHH4309/88, 32PHK4309/12, 32PFH4309/88, 32PHH4309/60, 32PHT4309/12, 32PFK4309/12, 32PFT4309/12, 32PFT4309/60, 32PHH4319/88, 32PHT4319/12, 32PHH4329/88, 32PFH4399/88, 32PHK5109/12, 40PFH4009/88, 40PFK4009/12, 40PFT4009/12, 40PFT4009/60, 40PFH4109/88, 40PFT4109/12, 40PFK4109/12, 40PFT4109/60, 40PFH4309/88, 40PFK4309/12, 40PFT4309/12, 40PFT4309/60, 40PFH4319/88, 40PFT4319/12, 40PFH4329/88, 40PFH4399/88, 40PFK5109/12, 42PFK5199/12, 42PFH5209/88, 42PFK5209/12, 42PFT5209/12, 42PFT5209/60, 47PFH4109/88, 47PFT4109/12, 47PFK4109/12, 47PFK5199/12, 47PFH5209/88, 47PFK5209/12, 47PFT5209/12, 47PFT5209/60, 48PFK5109/12, 50PFH4009/88, 50PFK4009/12, 50PFT4009/12, 50PFH4109/88, 50PFK4109/12, 50PFT4109/12, 50PFH4309/88, 50PFT4309/12, 55PFH5109/88, 55PFK5109/12, 55PFT5109/12, 55PFK5199/12, 55PFH5209/88, 55PFK5209/12, 55PFT5209/12, 50PFK4309/12.  Chassis TPN14.1E LA

 After repair of the backlight 715G6934-P0D-000-020, PF7708AS. Information from the master.

There are sensor resistors on the power supply board to set the backlight current R8613, R8614, R8615, R8616, R8617, R8618.
To reduce the backlight current, I removed two 1.2 Ohm resistors in the current sensor.
Driver current limitation. 715G6934, PF7708AS. General information.

To reduce the backlight current in the TV's with the 715G6934 power supply, and the PF7708BS LED driver chip, there are resistors as current sensor connected in parallel, R8613, R8614, R8615, R8616, R8617, R8618 connected to pin 8 of the PF7708AS.
You can remove one or two of them, then the total resistance of the resistor assembly will increase and the current in the backlight LEDs will decrease proportionally.
715G6934 current backlight
More on MainBoard Repair

 

 

  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.

 

The MainBoard 715G6901-M0C-000-004T is shown in the figure below:

715G6901-M0C-000-004T

The main features of the PHILIPS 40PFT4009:

TPT400LA-J6PE1 REV SC1L matrix (LED panel) is installed.
To power the LED backlight used converter, combined with a power supply, controlled by PWM controller PF7708AS. As the power elements of LED-driver CYS9240 type switches are used.
Required supply voltages for all PHILIPS 40PFT4009 TV assemblies are generated by the 715G6934-P0D-000-020 power supply module or its analogues using PF6003AHS, AOZ3015AI chips and TK8A65D type power keys.
MainBoard - the main board (motherboard) is a module 715G6901-M0C-000-004T, with the use of chips CPU: NT72567BG, Audio: AD87588 and others.
The NT78822 tuner allows you to receive TV programs and tune to channels.


Software update (firmware).

Version: V3.350, zip file, 58.9 MB, published April 7, 2016.

Russian version.

Documentation:

Quick guide PDF file, 1.3 MB, published July 25, 2014.

Brochure Version:2.3.1, PDF file, 537.9 kB, published July 19, 2019.

Operating instructions PDF file, 1.6 MB, published October 15, 2014.

Files can be downloaded from the manufacturer's website for the 40PFT4009/60 model.

PHILIPS 40PFT4009 LCD TV with a 40" (102 cm) diagonal 16:9 aspect ratio. The required brightness of 280 cd/m² is provided by the LED backlight. In the manufacturing technology of the display model is implemented LED backlighting.
The design and technical capabilities of the TV show provide for viewing shows and movies in HD quality at a resolution of 1920x1080 pixels in 1080p (Full HD). 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, MKV, JPEG.
The sound system capacity of 10 W (2x5 W) is provided by two speakers. NICAM stereo signal processing and Sound Surround surround sound function are used.
External interface (connection with other devices) is supported by standard input and output connectors: antenna input (RF), SCART, RGB, HDMI x2, 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, 1280x1024, 1360x768, 1920x1080. The digital tuner is able to receive DVB-T, DVB-T2, DVB-C TV channels.

Overall dimensions: with stand 904x550x256 mm, without stand 904x523x88 mm.

TV weight: with stand 7.8 kg, without stand 7.4 kg.

Warning. The panel of your PHILIPS 40PFT4009 LED TV 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!
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 PHILIPS 43PUS6401

Technical description and composition of  PHILIPS 43PUS6401 TV, type of panel and modules used. Module composition.

Specifications
PHILIPS 43PUS6401
LCD TV LED Smart TV UHD 43PUS6401 | Year of manufacture: 2016
Screen diagonal: 43" (109 cm)
Aspect ratio: 16:9
Resolution: 3840x2160
LCD panel type: TPT430U3-EQYSHM.G
LED backlight: Yes
Smart: yes. Wi-Fi support: yes
Operating system: Android TV
Support HD: 4K UHD
Brightness: 300 cd/m2
Progressive scan: Yes
TV Standards: PAL, SECAM, NTSC
Digital tuner: DVB-T, DVB-T2, DVB-C, DVB-S
Teletext: 1000 page memory.
DTV formats: 480i, 480p, 576i, 576p, 720p, 1080i, 1080p, 2160p
Multimedia: MP3, WMA, MPEG4, MKV, JPEG
Sound stereo: there is
Sound power: 20W (2x10W)
Acoustics: two speakers
Interface: AV, audio x2, component, SCART, RGB, HDMI x4, USB x3, Ethernet (RJ-45), Wi-Fi
Headphone jack: yes
TV weight: with stand: 9.9 kg
without stand: 9.4 kg
Dimensions: with stand 968x576x204mm
without stand 968x623x77mm
PHILIPS 43PUS6401

PHILIPS LED
Model: 43PUS6401/12

Chassis/Version: QM16.3E LA

Panel: TPT430U3-EQYSHM.G

LED backlight: GJ-2K16-430-D512-V4

T-CON: 6870C-0552A V15 43UHD TM120

LED driver (backlight): integrated into PSU

PWM LED driver: PF6002AS

MOSFET LED driver: TK11A65D

Power Supply (PSU): 715G7350-P01-000-002S

PWM Power: LD7591T, SSC3S121A

MOSFET Power: TK20A60W

MainBoard: 715G7776-M0F-B01-005K

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

Tune: TDSY-G430D

Control: WI-FI: 8WUSND16.4A1G
General advice about LCD LED TV repair
Possible problems

- PHILIPS 43PUS6401 TV does not turn on. There is no indication of any functionality. No LEDs on the front panel are not blinking or on, the TV does not respond.

In cases like this, the problem should start with the power supply circuits 715G7350-P01-000-002S. It is necessary to measure in its secondary circuits output voltages, and in case of their complete absence, you should check the serviceability of the power switches (TK20A60W) and the rectifier diodes for possible breakdown (short circuit).
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.
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) LD7591T, SSC3S121A, if do not have visible damage to the housing and outright short circuit between the pins, usually checked by replacing.

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

Often in such cases there is no backlight of the LED panel. The reason can be found in the malfunction LEDs, in violation of the contact connections of the LED strips GJ-2K16-430-D512-V4, or in their power supply (LED-driver).
It is impossible to check the LED strips for breakage without disassembling the panel with a multimeter or a 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 broken or broken in short circuit.

If PHILIPS 43PUS6401 has no picture, but there is sound, often the backlight of the display TPT430U3-EQYSHM.G. Moreover, in LED-TVs usually fail 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 TPT430U3-EQYSHM.G - 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 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 often the MainBoard 715G7776-M0F-B01-005K is also faulty, 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, you need to trace by oscilloscope the LVDS signals from MainBoard 715G7776-M0F-B01-005K, as well as synchronizing signals to driver stubs.

Filled or badly washed LED TV screens can be restored in about half of the cases, usually, if there are not significant damages in the hinges and slats of the panel.

- The TV does not turn on, the remote control does not respond. Indicator is blinking or in standby mode.

Repair or diagnostic of the motherboard 715G7776-M0F-B01-005K should begin with checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (firmware).

To owners of TV set 43PUS6401 we recommend to apply only to qualified specialists with necessary experience for repair! Attempting to repair it yourself without proper knowledge and skills can lead to irreversible negative consequences!


DOWNLOAD SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>   PHILIPS 43PUS6401 Chassis QM16.3E LA LA.

 

DOWNLOAD SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------> FOR MODELS : 43PUS6501/12, 43PUS6501/60, 43PUS6551/12, 43PUS6401/12, 43PUS6401/60, 43PUT6401/12, 49PUS6401/12, 49PUT6401/12, 49PUS6401/60, 49PUS6501/12, 49PUS6501/60, 49PUS6551/12, 49PUS6561/12, 49PUS6581/12, 49PUS7101/12, 49PUS7101/60, 49PUS7181/12, 55PUS6401/12, 55PUT6401/12, 55PUS6401/60, 55PUS6501/12, 55PUS6501/60, 55PUS6551/12, 55PUS6561/12, 55PUS6581/12, 55PUS7101/12, 55PUS7101/60, 55PUS7181/12, 65PUS6521/12, 65PUS6521/60, 65PUS7101/12, 65PUS7601/12, 75PUS7101/12, 75PUS7101/60.   Chassis QM16.3E LA

Refinement after repair of the backlight. 715G7350-P01-000-002S, PF6002AS. Information from the master.

Reduce backlight current from 190 mA to 140 mA - removed resistors R8625, R8633 in the LED driver current sensors on the 715G7350-P01-000-002S board.
Driver current limitation. 715G7350-P01-000-002S. 

General information.

To reduce the backlight current in TVs with the 715G7350-P01-000-002S power supply, the board has two assemblies of resistors (current sensors) for the two channels, R8624, R8625, R8626, R8627 and R8631, R8632, R8633, R8634. You can remove one or two resistors in each assembly for both channels equally.
715G7350-P01-000-002S current backlight
More on MainBoard Repair

 

 

 

The MainBoard 715G7776-M0F-B01-005K is shown in the figure below:

715G7776-M0F-B01-005K

The main features of the PHILIPS 43PUS6401 device:

A matrix (LED panel) TPT430U3-EQYSHM.G is installed.
Timing Controller (T-CON) 6870C-0552A is used to control the matrix.
The converter combined with a power supply is used to power the LED backlight and is controlled by a PWM controller PF6002AS. As the power elements of LED-driver are used switches type TK11A65D.
Required supply voltages for all PHILIPS 43PUS6401 TV assemblies are generated by power supply module 715G7350-P01-000-002S or its analogues using LD7591T, SSC3S121A chips and TK20A60W type power keys.
MainBoard - the main board (motherboard) is a module 715G7776-M0F-B01-005K, with the use of chips CPU, eMMC, DRAM, AUDIO, DC/DC and others.
The TDSY-G430D tuner provides TV program reception and channel tuning.

Software update (firmware).

Version: 000.026.068.000, zip file, 945.8 MB, published December 9, 2019.

Russian version.

Documentation:

Brochure Version:11.0.1, PDF file, 550.0 kB, published May 14, 2020.

Quick Start Guide PDF file, 1.8 MB, published April 11, 2017.

Operating instructions PDF file, 4.4 MB, published April 23, 2018.

You can download the files from the manufacturer's website for the 43PUS6401/60 model.


PHILIPS 43PUS6401 LCD TV TPT430U3-EQYSHM.G, 43" (109 cm) diagonal. (109 cm) in 16:9 aspect ratio. The required brightness of 300 cd/m² is provided by an LED backlight. In the technology of manufacture of the display model is implemented LED backlighting.
Matrix TPT430U3-EQYSHM.G and MainBoard software 715G7776-M0F-B01-005K able to realize the image in the highest quality UHD at 3840x2160 pixels in 4K UHD standard.
The 43PUS6401 has built-in SMART software and the Android TV Operating System. Connection to the network can be made through Wi-Fi wireless communication. 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, 2160p. Supported media file formats: MP3, WMA, MPEG4, MKV, JPEG.
The sound system capacity of 20 W (2x10 W) is 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), AV, audio x2, component, SCART, RGB, HDMI x4, USB x3, Ethernet (RJ-45), Wi-Fi. 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, 3840x2160. The digital tuner is able to receive TV channels in the standards DVB-T, DVB-T2, DVB-C, DVB-S, DVB-S2.

The TV uses a power supply 715G7350-P01-000-002S.

Dimensions: with stand 968x576x204 mm, without stand 968x623x77 mm.

TV weight: with stand 9.9 kg, without stand 9.4 kg.

Warning. The panel TPT430U3-EQYSHM.G LED-TV PHILIPS 43PUS6401 is an expensive and unreliable part of the TV.
Do not allow any impacts 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.

REPAIRING / SERVICING TV LG 43LK5990PLE

Technical description and composition of LG 43LK5990PLE TV, type of panel and modules used. Module composition.
Composition
Specifications
LG 43LK5990PLE
LCD TV LED Smart 43LK5990 | Year of manufacture: 2018
Screen diagonal: 42.5" (108 cm)
Screen format: 16:9
Resolution: 1920x1080
Frequency refresh rate:     50Hz
LED backlight: aye, Direct LED
Smart: yes. Wi-Fi support: yes
Operating system: webOS
Supports HD: 1080p Full HD, HDR
Progressive scan: yes
Digital tuner: DVB-T, DVB-T2, DVB-C, DVB-S, DVB-S2
Teletext: Yes
Multimedia: MP3, WMA, MPEG4, HEVC (H.265), DivX, MKV, JPEG
Stereo sound: there is
Sound power: 10W (2x5W)
Acoustics: two speakers
Interface: AV, component, HDMI x2, USB, Ethernet (RJ-45), Wi-Fi 802.11ac, Miracast
Headphone jack: yes
TV weight: with stand: 8.1 kg
Without stand: 7.6 kg
Dimensions: with stand 976x628x218mm
without stand 976x583x70mm
Find out more...
LG 43LK5990PLE

LG LED
Model: 43LK5990PLE

Chassis/Version: CHASSIS LJ8

Panel: AC430DUN-SLDM2_RA

LED backlight: 17Y 43inch_ A-Type LED_ARRAY_REV0.0_170632

T-CON: 6870C-0532A

LED driver (backlight): integrated into PSU

PWM LED driver: LC5910

MOSFET LED driver: TO-252

Power Supply (PSU): EAX67264001 LGP43DJ-17F1 PLDF-L602A

PWM Power: PFC, PWM

MOSFET Power: TO-252

MainBoard: EAX67703503 (1.1)

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

MainBoard: TDJA-G601D
General advice about LCD LED TV repair
Possible trouble spots

- LG 43LK5990PLE TV does not turn on, does not respond to the remote and control panel buttons, does not shine or blink indicators.

Most often with such manifestations turns out to be faulty main power module EAX67264001. It is necessary then to measure its output voltages and in case they are missing, check the power switches (TO-252) and the rectifier diodes of the converters for possible 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 PFC, PWM chips are usually checked by replacing them with new or known good ones.

- No picture, but there is sound and reaction to remote control. Or for a second the image may appear right after turning on.

The defect in these cases is usually the most probable in the nodes of the display matrix backlight. Often the cause is a faulty LED (breakage, short circuit...), or connectors of bars (strings) 17Y 43inch_ A-Type LED_ARRAY_REV0.0_170632, less often faulty is the LED-driver.
It is better to use a power supply with a maximum voltage of 200v to check the condition of the LED circuit. It is not recommended to use any voltage sources for this purpose. You can check each LED individually with a simple Chinese multimeter (9 volt) in P-N junction test mode. If you connect the red probe of the multimeter to the anode of the LED and the black to its cathode, then the 3 volt LED will light up slightly and in the opposite direction you will find the faulty junction of the stabilizer. The functionality of the PN junction of the stabilizer is indirectly an indication of the functionality of the LED.

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

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

Repair or diagnostic of motherboard EAX67703503 should be started from checking stabilizers and power converters necessary to power the chips and matrix. If necessary, software (software) should be updated or replaced. Complex repair of MB (SSB) is possible only in the conditions of the service center with the necessary equipment. Checking or replacing the CPU, eMMC, SPI Flash, DRAM, AUDIO, DC/DC elements requires the necessary training and professional skills to repair the modules at the component level. Problems related to the use of BGA soldering technology can sometimes be diagnosed by the heating method.

If the TV works normally from external devices, but does not tune to the TV channels, the TDJA-G601D tuner may be malfunctioning. In these cases you should first make sure that there is power to the corresponding pins of the tuner. Also make sure that the tuner and the processor are communicating via the I2C bus. Sometimes the reason of the tuner malfunction can be a software error.

Warning. Users and owners of TV sets 43LK5990PLE, not having the appropriate qualification, knowledge and experience, strongly recommend not to try to repair the unit yourself in order to avoid the negative consequences that can lead to complete unrepairable device.

 



Repair of backlight EAX67264001 LGP43DJ-17F1, LC5910. Information from the master.

Decreased backlight current from 320 mA to 270 mA - increased R801 0.8 Ohm resistor to 1 Ohm in the backlight current sensor on the power supply board EAX67264001.
Backlight driver current limitation. EAX67264001 LGP43DJ-17F1, LC5910. General recommendations.

To reduce the backlight current in LGP43DJ-17F1 EAX67264001 (1.5) TVs with the LC5910 LED driver chip, you can increase the current sensor resistance R801 at the source of the converter power switch proportionally.
LGP43DJ-17F1 current backlight

A PDF document of the LC5910S 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 EAX67703503 is shown in the figure below:

EAX67703503

MainBoard Appearance

 

:

EAX67264001.

The main features of the LG 43LK5990PLE device:

A matrix (LED panel) AC430DUN-SLDM2_RA is installed.
Timing Controller (T-CON) 6870C-0532A is used to control the matrix.
To power the backlight LEDs a converter combined with a power supply is used, controlled by the LC5910 PWM controller. As the power elements of LED-driver are used switches of TO-252 type.
Forming of the necessary supply voltages for all LG 43LK5990PLE TV nodes is made by EAX67264001 power supply module, or its analogues with the use of PFC, PWM chips and TO-252 type power keys.
MainBoard - the main board (motherboard) is an EAX67703503 module, using CPU, eMMC, SPI Flash, DRAM, AUDIO, DC/DC and other chips.
The TDJA-G601D tuner provides TV program reception and channel tuning.

Instructions and updates

There are downloadable files for the 43LK5990PLE model from the manufacturer:

Update and instruction files:
File Description File Name Type Date Size
SW File (Version 05.10.30) . Firmware (USB) Software_File(Version_05.10.30).zip zip 26.03.2020 824985K
Compatible with 32LK540BPLA, 32LK6100PLB, 32LK610BPLB, 32LK615BPLB, 32LK6190PLA, 32LK6200PLA, 43LK5400PLA, 43LK5900PLA, 43LK5910PLC, 43LK5990PLE, 43LK6000PLF, 43LK6100PLA, 43LK6100PLB, 43LK6200PLD, 49LK5400PLA, 49LK5900PLA, 49LK5910PLC, 49LK6000PLF, 49LK6100PLA, 49LK6100PLB, 49LK6200PLD.
SW File (Version 05.10.30) . TV_Software_Update_Guide_v3.pdf PDF 26.03.2020 2014K update instructions

Manuals and User Manuals:
Document Language Date Size
Quick Start Guide English - English,Estonian,Latvian,Lettish,Lithuanian,Russian 11.05.2020 55 037K
Quick Start Guide English - English,Estonian,Latvian,Lettish,Lithuanian,Russian 11.05.2020 No data
Quick start guide English - English 05.31.2018 4067K

You can download the files from the manufacturer's website for the model 43LK5990PLE.


LG 43LK5990 LCD TV with AC430DUN-SLDM2_RA, 42.5" (108 cm) diagonal in 16:9 aspect ratio. The LCD-panel implements the principle of direct display backlighting with a rear arrangement of LEDs - Direct LED.
Matrix AC430DUN-SLDM2_RA and MainBoard software EAX67703503 provide for viewing shows and movies in high quality HD resolution 1920x1080 pixels in 1080p (Full HD) graphic decomposition. Image processing is made by modern technology High Dynamic Range (HDR) with an extended range of brightness gradation.
The TV model 43LK5990 has built-in SMART software and webOS operating system. Connection to the network can be made via Wi-Fi wireless connection. Supported media formats: MP3, WMA, MPEG4, HEVC (H.265), DivX, MKV, JPEG.
The speaker system sound power of 10 W (2x5 W) is provided by two speakers. NICAM stereo sound processing and Sound Surround surround function are used.
Communication with other devices via an external interface is supported by standard input and output sockets: antenna input (RF), AV, component, HDMI x2, USB, Ethernet (RJ-45), Wi-Fi 802.11ac, Miracast. There is a headphone jack. The digital tuner receives DVB-T, DVB-T2, DVB-C, DVB-S, DVB-S2 TV channels.

The TV uses the EAX67264001 power supply.

Overall dimensions: with stand 976x628x218 mm, without stand 976x583x70 mm.

TV weight: with stand: 8.1 kg, without stand: 7.6 kg.

Warning. The panel AC430DUN-SLDM2_RA of LG 43LK5990 LED TV is an expensive and unreliable part of it.
Avoid 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 43LK5910PLC

Technical description and composition of LG 43LK5910PLC TV, type of panel and modules used. Module composition.
Composition
Specifications
LG 43LK5910PLC.
LCD TV LED Smart 43LK5910 | Year of manufacture: 2018
Screen diagonal: 42.5" (108 cm)
Screen format: 16:9
Resolution: 1920x1080
Frequency refresh rate:     50Hz
LED backlight: aye, Direct LED
Smart: yes. Wi-Fi support: yes
Operating system: webOS
Supports HD: 1080p Full HD, HDR
Progressive scan: yes
Digital tuner: DVB-T, DVB-T2, DVB-C, DVB-S
Multimedia: MP3, WMA, MPEG4, Xvid, MKV, JPEG
Audio Stereo: There is
Sound Power: 10W (2x5W)
Acoustics: two speakers
Interface: AV, component, HDMI x2, USB, Ethernet (RJ-45), Wi-Fi 802.11ac, Miracast
Headphone jack: Yes
Find out more...
LG 43LK5910PLC

LG LED
Model: 43LK5910PLC

Chassis/Version: CHASSIS LJ8

Panel: AC430DUN-SLDM3_RA

LED backlight: UF64_UHD_A

T-CON: 6870C-0532A (6871L-3806L)

LED driver (backlight): integrated into PSU

PWM LED driver: LC5910 SO-8 Step-Down

MOSFET LED driver: TO-252

Power Supply (PSU): EAX67264001 (1.5) LGP43DJ-17F1

PWM Power: PFC, PWM

MOSFET Power: TO-252

MainBoard: EAX67703503 (1.1)

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

MainBoard: TDJA-G601D
General advice about LCD LED TV repair
Possible problems

- LG 43LK5910PLC does not turn on, the buttons and remote does not respond, the indicators on the front panel are not lit or blinking.

Usually with such manifestations defect is caused by faulty elements in the main power module EAX67264001. It is necessary to check the presence of its output voltages and in case of their complete absence check the power switches (TO-252) and the rectifier diodes for possible short circuits.
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 Mos-Fet switches, used in pulse sources, is often caused by failures of other elements, for example, in the PWM regulator supply circuit, in frequency-retaining or damping circuits, as well as in the Negative Feedback Stabilization. PWM PFC, PWM chips are usually checked by replacing them with new or known good ones.

- There is no picture, but there is sound and all other TV functions work. The picture sometimes appears for a second immediately after switching on and then disappears.

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

Usually in such cases there is no backlighting of the LED panel (matrix). The cause may be a breakage of the backlight LEDs, in the stabilization of their power supply, or in a violation of the contact connections of the string connectors.
To check the LED strips, to open all the LED transitions, you need a few tens of volts or more, it is best to use a current source for such purposes. Breakage of several PN-junctions connected in series cannot be detected with a multimeter or a tester. In such cases, you need to open the panel and check each LED. If your multimeter can't open the transitions of the LEDs in forward bias, you can sometimes detect the PN junction of a protective stabilizer by connecting the probes in the opposite direction. If the regulator is open or broken in K/Z, then the LED is faulty and needs to be replaced.

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

Repair or diagnostic of motherboard EAX67703503 should begin with checking the stabilizers and power converters necessary to power the chips and matrix. If necessary, the software (software) should be updated or replaced. When repairing the MB board, check its components CPU, eMMC, SPI Flash, DRAM, AUDIO, DC/DC. Defective elements should be replaced. If the chips with BGA soldering technology are used, the problem in its implementation is detected by the method of local heating of the chip.

If there is no TV channel reception, but the TV set is working properly from external devices, you must first check the supply voltage of the TDJA-G601D tuner and update the software. Pulses of the I2C bus communication should be checked with an oscilloscope.

Warning to TV Owners! The attempts to repair LG 43LK5910PLC by yourself are not recommended by the manufacturer and can cause serious negative consequences!


Repair after repair of backlight EAX67264001 LGP43DJ-17F1, LC5910. Information from the master.

Decreased backlight current from 620 mA to 280 mA - I increased R801 0.8 Ohm resistor rating to 2.2 Ohm in the backlight current sensor on EAX67264001 power supply board.
Limiting the backlight driver current. EAX67264001 LGP43DJ-17F1, LC5910.

General recommendations.

Reduce backlight current from 620 mA to 280 mA - I increased the R801 0.8 Ohm resistor to 2.2 Ohm in the backlight current sensor on the power supply board EAX67264001.
Limiting the backlight driver current. EAX67264001 LGP43DJ-17F1, LC5910. General recommendations.

To reduce the backlight current in LGP43DJ-17F1 EAX67264001 (1.5) TVs with the LC5910 LED driver chip, you can increase the current sensor resistance R801 at the source of the converter power switch proportionally.
LGP43DJ-17F1 current backlight

A PDF document of the---------------------->  LC5910S 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.

More on MainBoard Repair

The MainBoard EAX67703503 is shown in the figure below:

EAX67703503

MainBoard Appearance

EAX67264001:

EAX67264001.

Main features of the LG 43LK5910PLC:

A matrix (LED panel) AC430DUN-SLDM3_RA is installed.
The matrix is controlled by the Timing Controller (T-CON) 6870C-0532A.
To power the backlight LEDs a converter combined with a power supply is used, controlled by a LC5910 SO-8 Step-Down PWM controller. As the power elements of the LED-driver switches of TO-252 type are used.
Necessary supply voltages for all LG 43LK5910PLC TV nodes are generated by the EAX67264001 power supply module or its analogues with the use of PFC, PWM chips and TO-252 type power keys.
MainBoard - the main board (motherboard) is an EAX67703503 module, using CPU, eMMC, SPI Flash, DRAM, AUDIO, DC/DC and other chips.
The TDJA-G601D tuner provides TV program reception and channel tuning.


Instructions and updates

There are downloadable files for the 43LK5910PLC model from the manufacturer:

Update and instruction files:
File Description File Name Type Date Size
SW File (Version 05.10.30) . Firmware (USB) Software_File(Version_05.10.30).zip zip 26.03.2020 824985K
Compatible with 32LK540BPLA, 32LK6100PLB, 32LK610BPLB, 32LK615BPLB, 32LK6190PLA, 32LK6200PLA, 43LK5400PLA, 43LK5900PLA, 43LK5910PLC, 43LK5990PLE, 43LK6000PLF, 43LK6100PLA, 43LK6100PLB, 43LK6200PLD, 49LK5400PLA, 49LK5900PLA, 49LK5910PLC, 49LK6000PLF, 49LK6100PLA, 49LK6100PLB, 49LK6200PLD.
SW File (Version 05.10.30) . TV_Software_Update_Guide_v3.pdf PDF 26.03.2020 2014K update instructions

Manuals and User Manuals:
Document Language Date Size
Quick Start Guide English - English,Estonian,Latvian,Lettish,Lithuanian,Russian 11.05.2020 55 037K
Quick Start Guide English - English,Estonian,Latvian,Lettish,Lithuanian,Russian 11.05.2020 No data
Quick start guide English - English 10.07.2020 6308K

You can download the files on the website of the manufacturer for the model 43LK5910PLC.


LG 43LK5910 LCD TV with AC430DUN-SLDM3_RA, 42.5" (108 cm) diagonal in 16:9 aspect ratio. The LCD panel implements the principle of direct display backlighting with a rear arrangement of LEDs - Direct LED.
Matrix AC430DUN-SLDM3_RA and MainBoard software EAX67703503 provide for viewing shows and movies in high quality HD resolution 1920x1080 pixels in 1080p (Full HD) graphic decomposition. Image processing is made by modern technology High Dynamic Range (HDR) with an extended range of brightness gradation.
The 43LK5910 has built-in SMART software and webOS operating system. Connection to the network can be made through Wi-Fi wireless communication. Supported media formats: MP3, WMA, MPEG4, Xvid, MKV, JPEG.
The sound system capacity of 10 W (2x5 W) is provided by two speakers. NICAM stereo sound processing and Sound Surround surround function are used.
Communication with other devices via an external interface is supported by standard input and output sockets: antenna input (RF), AV, component, HDMI x2, USB, Ethernet (RJ-45), Wi-Fi 802.11ac, Miracast. There is a headphone jack. The digital tuner receives DVB-T, DVB-T2, DVB-C, DVB-S, DVB-S2 TV channels.

The TV set has the EAX67264001 power supply.

Warning. The AC430DUN-SLDM3_RA panel of the LG 43LK5910 LED TV is an expensive and unreliable part 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!
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 THOMSON T55FSE1170

Technical description and composition of the THOMSON T55FSE1170 TV, type of panel and modules used. Module composition.
Composition/Specifications
THOMSON T55FSE1170
LCD TV LED T55FSE1170 | Year of manufacture: 2018
Screen diagonal: 54.6" (139 cm)
Aspect ratio: 16:9
Resolution: 1920x1080
Refresh rate:     50Hz
LED backlight: Yes, Direct LED
Support HD: 1080p Full HD
Brightness: 290 cd/m2
Contrast: 4000:1
Viewing Angle: 178°
Pixel Response Time:     6.5 ms
Progressive scan: Yes
Digital tuner: DVB-T, DVB-T2, DVB-C, DVB-S, DVB-S2
Number of channels: 799
Teletext: there is
Multimedia: MP3, MPEG4, HEVC (H.265), Xvid, MKV, JPEG
Sound stereo: there is
Sound power: 16W (2x8W)
Acoustics: two speakers
Interface: AV, HDMI x2, USB x2
Headphone jack: yes
TV weight: 13 kg
Dimensions: with stand 1242x770x250 mm
without stand 1242x729x80 mm
AC power consumption: 100W
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THOMSON T55FSE1170

THOMSON LED
Model: T55FSE1170

Chassis/Version: T.MS3663S

Panel: LVF550CSDX

LED driver (backlight): integrated into PSU

PWM LED driver: OB3365RP

MOSFET LED driver: MDF13N50

Power Supply (PSU): SHG6004C-101H

PWM Power: FA1A60N, FA6B20N

MOSFET Power: MMD60R580Q

MainBoard: T.MS3663S.782 1MS663E0S2A

MainBoard IC: CPU, SPI Flash, AUDIO, DC/DC

MainBoard: CDT-9NT372-RF01 & SAT
General advice about LCD LED TV repair
Possible problems

- THOMSON T55FSE1170 TV set doesn't turn on at all. No reaction to remote control or front panel controls. No indicator light is on or is not blinking.

In such cases the SHG6004C-101H power supply is usually the defective one. It is necessary to measure its output voltages, and if there are no such voltages, check the condition of the power switches (MMD60R580Q) of the converters and the rectifier diodes for possible short circuits.
At breakdowns in the secondary circuits of the inverter, usually it can crash in the short-circuit mode, and at short circuit in the power elements of the primary circuit most often the mains fuse or current sensor in the source of the key breaks.
Breakdown of Mos-Fet switches used in pulse sources is often caused by failures of other elements, for example, in PWM controller power supply circuit, in frequency-retaining or damping circuits, as well as in the Negative Feedback Stabilization. PWM microcircuits FA1A60N, FA6B20N are usually checked by replacement with the new ones, or known to be in good condition.

- No picture, but there is sound and reaction to the remote control. Or the image may appear for a second immediately after turning on.

In some of these cases the malfunction is caused by the lack of display backlighting. The cause may sometimes be in the power supply of LEDs, but more often in their failure (breakdown or breakage), sometimes in violation of the contact connections of LED strips.
When trying to identify breaks in the LED strips, you should keep in mind that it is difficult to do without disassembling the panel. You need, for example, a current source to open the PN-junctions connected in series.

If THOMSON T55FSE1170 has no picture but sound, often the LVF550CSDX display backlight simply does not work. Moreover, in LED televisions, 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 LVF550CSDX - a process which requires 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 the backlight works - the screen becomes slightly lighter when you turn it on, and you can see the light through the holes in the body of the panel when the TV is open.
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 T.MS3663S.782 is defective, and so is the software.
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 with an oscilloscope the LVDS signals from MainBoard T.MS3663S.782, as well as synchronizing signals to driver stubs.

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

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

Repair or diagnostic of the T.MS3663S.782 motherboard should begin with checking the stabilizers and power converters necessary to power the chips and matrix. If necessary, software (software) should be updated or replaced. Sometimes elements of MainBoard - CPU, SPI Flash, AUDIO, DC/DC need checking or replacement (if necessary). In cases where a BGA processor is used, its failure is usually detected by local heating method.

If you cannot tune to the terrestrial or cable TV channels, make sure the software is correct, and the supply voltages on the CDT-9NT372-RF01 & SAT tuner pins are correct. It is also necessary to control with an oscilloscope the presence of pulses of data exchange between the tuner and the processor via the I2C bus.

Remember! Attempts to repair your THOMSON T55FSE1170 TV set yourself, if you do not have the necessary skills and experience, is categorically not recommended and is fraught with negative consequences, up to the complete unrepairability of the device!

Refinement after repair of the backlight. SHG6004C-101H, OB3365RP. Information from the master.

Reduce backlight current from 410 mA to 250 mA - On the SHG6004C-101H board on pin 2 of ISET chip OB3365RP in parallel resistors R229 47 kOhm and R239 68 kOhm. Removed 68 kOhm resistor.
Driver current limitation. OB3365RP. 

General info.

To reduce the backlight current you can remove one of the resistors on pin 2 of the ISET chip OB3365RP, so that their total resistance increases in proportion to the reduced current in the LEDs.
More on MainBoard Repair

The appearance of the MainBoard T.MS3663S.782 is shown in the figure below:

T.MS3663S.782

MainBoard Appearance

SHG6004C-101H:

SHG6004C-101H

Main features of THOMSON T55FSE1170:

LVF550CSDX matrix (LED panel) is installed.
To power the LED backlight used converter, combined with a power supply, controlled by a PWM controller OB3365RP. MDF13N50 type switches are used as power elements of LED-driver.
Forming of necessary power supply voltages for all THOMSON T55FSE1170 TV set components is performed by the SHG6004C-101H power module or its analogues with the use of FA1A60N, FA6B20N chips and MMD60R580Q type power keys.
MainBoard - the main board (motherboard) is a module T.MS3663S.782, with the use of chips CPU, SPI Flash, AUDIO, DC / DC, and others.
The CDT-9NT372-RF01 & SAT tuner provides TV program reception and channel tuning.

 

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

 

THOMSON T55FSE1170 LED TV with LVF550CSDX LCD display, measuring 54.6" (139 cm) diagonally in 16:9 aspect ratio. 290 cd/m² of claimed brightness is provided by an advanced LED backlight with a maximum brightness to minimum brightness ratio (contrast ratio) of at least 4000:1. In the LCD-panel uses direct backlighting with a back arrangement of LEDs - Direct LED.
LVF550CSDX matrix and MainBoard T.MS3663S.782 software implement an image in high quality HD with 1920x1080 pixels resolution in 1080p (Full HD) graphic decomposition. Supports multimedia formats: MP3, MPEG4, HEVC (H.265), Xvid, MKV, JPEG.
The sound system capacity of 16 W (2x8 W) is provided by two speakers. NICAM stereo processing system and Sound Surround surround sound function are used.
External interface (connection with other devices) is supported by standard input and output connectors: antenna input (RF), AV, HDMI x2, USB x2. There is a headphone jack. The digital tuner has DVB-T, DVB-T2, DVB-C, DVB-S, DVB-S2 standards.

The power consumed by the TV in mains mode is 100 watts. SHG6004C-101H power supply.

Overall dimensions: with stand 1242x770x250 mm, without stand 1242x729x80 mm.

The TV weight is 13 kg.

Warning. The panel on the LVF550CSDX LED TV THOMSON T55FSE1170 is an expensive and fragile part of the TV.
Avoid 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.