REPAIRING / SERVICING TV LG 32LH590U

 Technical description and composition of the LG 32LH590U TV, panel type and modules used. The composition of the

modules.

LG LED
Model: 32LH590U

Chassis / Version: LD66K / LD66Y

Panel: HC320DXN-VSVS1-511X

LED backlight: 15.5Y 32INCH A-TYPE REV0.0 160323

LED driver (backlight): integrated into MainBoard

PWM LED driver: MP3378E

MOSFET LED driver: TO-252

Power Supply (PSU): Adapter 19V

MainBoard: EAX66853404 (1.1)

IC MainBoard: EEPROM: 24C256

Tuner: TDJM-G301D EBL61741401

Control: Wi-Fi: TWFM-B006D, IR + Button: EBR80772001 SRG9CA0000A

Specifications 32LH590U
LG 32LH590U
General recommendations for TV LCD LED repair
Possible manifestations of defects

- LG 32LH590U does not turn on, indicators on the front panel are not lit or blinking. The TV does not respond to the control buttons and the remote control.

With such manifestations, the adapter power supply usually fails.
The owner of the TV can purchase an external power supply Adapter 19V on his own, and its repair is not always advisable, but sometimes it makes sense to open it and eliminate simple defects typical of the SMPS. Then we recommend measuring its output voltages and, if they are absent, you should check the serviceability of the power switches and rectifier diodes of the converters for a possible short circuit.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in an emergency mode of short circuit without output voltages, and with a short circuit in the elements of the primary circuit, the mains fuse most often breaks off immediately and, less often, the current sensor in the source of the key.
Mos-Fet power switches used in switching power supplies sometimes fail due to a malfunction of any other elements that can disable it in the key mode, or create an excess of the maximum permissible key parameters. These can be elements supplying a PWM regulator, frequency setting or damper circuits, or elements of negative feedback in the stabilization circuit. PWM controllers, in the absence of visible damage or outright short circuits between the terminals, are checked by replacing them with new ones, or knowingly working properly.

- There is no picture, but there is sound and reaction to commands from the remote control. Or the image appears immediately after switching on and disappears.

The most likely problem in these cases is a malfunction of the LED backlight. The reason may be in the breakage of the backlight LEDs, in the stabilization of their power supply, or in the violation of the contact connections of the strings 15.5Y 32INCH A-TYPE REV0.0 160323.
It is impossible to identify an open circuit in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and a voltage of several tens of volts is required to open their junctions. Ideally, a current source is suitable for such purposes. You can open the panel and check each LED separately. Usually, Chinese multimeters lightly light one 3-volt LED if you connect the probes to it in the forward direction (red probe to the anode, black to the cathode). For dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of LED health. In the event of a malfunction of the LED, its zener diode will either be cut off, or broken through in the K / Z.

If LG 32LH590U has no picture, but there is sound, often the HC320DXN-VSVS1-511X display backlight simply does not work. Moreover, in LED TVs, the LEDs inside the panel usually fail, less often the LED driver.
In such cases, you can see a barely noticeable image when the external light hits the screen.

Replacing the LEDs requires disassembling the HC320DXN-VSVS1-511X LCD panel - a process that requires experience and qualifications from the master. I do not recommend doing such work on your own to TV owners and craftsmen who do not have experience in repairing LCD panels

If there is no image, and the backlight is on, the screen becomes slightly lighter when turned on, and in an open TV you can see the light through the holes in the panel case.
In this case, the panel may also be faulty - damage to the strips, loops, for example, as a result of moisture ingress after unsuccessful washing of the screen, the T-CON (Timing Controller) board may be faulty. But the main board MainBoard EAX66853404 often turns out to be faulty, a software failure is also possible.
Then, first of all, you need 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 the normal range, it is necessary to trace the passage of LVDS signals from the MainBoard EAX66853404 with an oscilloscope, as well as synchronizing signals to the loops with drivers.

Flooded or unsuccessfully washed screens of LED TVs can be restored, in about half of the cases, usually if significant damage has not formed in the loops and panel strips.

- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals the standby mode.

Repair or diagnostics of the EAX66853404 motherboard should begin with checking the stabilizers and power converters required to power the microcircuits and matrix. If necessary, you should update or replace the software (software). In cases of complex MB (SSB) repairs and with the necessary skills and equipment, it may sometimes be necessary to replace its EEPROM chips: 24C256 and other possible faulty components. Malfunctions associated with the use of BGA soldering technologies are usually easily diagnosed by the warm-up method.

Before replacing the tuner TDJM-G301D EBL61741401, if there is no tuning to the channels, you must first check the software and the supply voltage at its outputs. You also need to make sure that the tuner and processor can exchange data via the I2C bus

Attention! Users and owners of 32LH590U TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from attempting to repair themselves in order to avoid negative consequences that may lead to complete non-repairability of the device.

Driver current limiting after backlight repair. Information from the master.

Reduce the backlight current from 400 mA to 280 mA - replaced the resistor R614 at the ISET MP3378E control input pin 3. Set the nominal value to 10 kOhm.
Driver current limitation. MP3378E. general information

To reduce the backlight current in LED drivers with the MP3378E PWM controller, it is necessary to proportionally increase the total resistance of the resistors from pin 3 (ISET) to the case. Calculation of current in milliamperes and resistance in kilo-ohms 977 / Rset for each channel. Parallel channels are summed. For example, for four parallel channels and a RISET 10 KOhm resistance, the total current will be 97.7 * 4 = 391 mA.

DOWNLOAD SCHEMATIC DIAGRAM MP3378E PWM controller   ------------------>   MP3378E

 

The appearance of the MainBoard EAX66853404 is shown in the figure below:

EAX66853404

EAX66853404 can be used in TVs:

LG 32LH595U (Panel HC320DXN-ABVS2-5112), LG 32LH570U (Panel HC320DXN-VHVS1-214X).

Main features of the LG 32LH590U device:

Installed matrix (LED panel) HC320DXN-VSVS1-511X.
To power the backlight LEDs, a converter combined with the EAX66853404 main board is used, controlled by the MP3378E PWM controller. TO-252 switches are used as power elements of the LED driver.
To power all internal components of the LG 32LH590U TV, an external adapter 19V is used.
MainBoard - the main board (motherboard) is an EAX66853404 module, using EEPROM chips: 24C256 and others.
Tuner TDJM-G301D EBL61741401 provides reception of television programs and tuning to channels.


Instructions and updates

There are files to download for the 32LH590U model from the manufacturer:

Files with updates and instructions:
File Description File Name Type Date Size
SW File (Version 05.30.80). Update instructions TV_Software_Update_Guide_v3.pdf PDF 09/04/2020 2014K
SW File (Version 05.30.80). Firmware (USB) Software_File (Version_05.30.80) .zip ZIP 04.09.2020 755968K
Compatible with 32LH590U-ZE, 32LH595U-ZA, 32LH6047-ZB, 32LH604V-ZB, 32LH609V-ZF, 43LH590V-ZA, 43LH590V-ZD, 43LH595V-ZE, 43LH6047-ZB-43LAH604V 43LH630V-ZJ, 49LH590V-ZA, 49LH590V-ZD, 49LH595V-ZE, 49LH6047-ZB, 49LH604V-ZA, 49LH604V-ZB, 49LH609V-ZF, 49LH630V-ZJ, 55LH60HV60 ZB, 55LH604H60 ZBL ZF, 55LH630V-ZJ.

User Manuals and Instructions:
Document Language Date Size
Quick Start Guide English - English, Estonian, Latvian, Lettish, Lithuanian, Russian 07/01/2020 59 734K
Quick Start Guide English - English, Estonian, Latvian, Lettish, Lithuanian, Russian 07/01/2020 No data
User manuals English - English, Estonian, Latvian, Lettish, Lithuanian 09.20.2016 21094K

Files can be downloaded from the manufacturer's website for the 32LH590U model.


LG 32LH590U TV with HC320DXN-VSVS1-511X LCD, 32 "(81 cm) 16: 9 format diagonal. The LCD-panel implements the principle of direct backlight display with rear-mounted LEDs - Direct LED.
The HC320DXN-VSVS1-511X sensor and MainBoard EAX66853404 software provide high quality HD viewing at 1366x768 pixels and 720p (HD Ready).
TV model 32LH590U has built-in SMART software and webOS operating system installed. The connection to the network can be carried out via Wi-Fi wireless connection. Supported media file formats: MP3, WMA, MPEG4, DivX, MKV, JPEG.
Speaker power of 6 W (2x3 W) is provided by two speakers. The NICAM stereo audio processing system and the Sound Surround function are used.
Communication with other devices via an external interface is supported by standard input and output connectors: antenna input (RF), AV, component, HDMI x2, USB, Ethernet (RJ-45), Wi-Fi 802.11n, WiDi, Miracast. The digital tuner is capable of receiving television channels in the DVB-T, DVB-T2, DVB-C, DVB-S2 standards.

The TV uses an external adapter 19V power supply.

Dimensions: With stand 641x435x186 mm, Without stand 641x396x57 mm.

Attention! The HC320DXN-VSVS1-511X panel of the LG 32LH590U LED TV is an expensive and unreliable element.
Do not allow any impact on the glass and pressure on the screen surface to avoid damage to the LED panel!
It is also unsafe for liquid to spill onto the screen. Sometimes one drop is enough if it drips down the glass onto the cables to make the TV unrepairable.

REPAIRING / SERVICING TV LG 43UF640V

Technical description and composition of LG 43UF640V TV, type of panel and modules used. Module composition.

LG LED
Model: 43UF640V

Chassis/Version: LD59R

Panel: HC430DGG-SLNX1-211X

LED backlight: UF64_UHD_A 43INCH

T-CON: 6870C-0647A 6871L-4293F

LED driver (backlight): integrated into MainBoard

MOSFET LED driver: TO-220F

Power Supply (PSU): EAX66472001 (1.5) EAY64009401

PWM Power: PFC, PWM (SSC3S921 )

MOSFET Power: TO-220, TO252

MainBoard: EAX66485504 (1.0) EBT63988801

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

TDJM-G301D EBL61560001

Specifications 43UF640V
LG 43UF640V
General recommendations for LCD LED TV repair
Possible defects

- LG 43UF640V TV does not turn on at all. No reaction to remote control and front panel control buttons. Indicator lights are not lit or blinking.

Often in such cases the power module EAX66472001 is defective. It is necessary to measure its output voltages, and in case of their absence (full or partial), check the condition of the power switches (TO-220, TO252) of the converters and the rectifier diodes for possible short circuits.
If there is a breakdown in the secondary circuits of the converter, it can usually fail in the short-circuit mode, and if there is a short circuit in the power elements of the primary circuit, most often the line fuse or the current sensor at the source of the key breaks.
Mos-Fet power switches used in switching 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 or damping circuits, or the negative feedback elements in the stabilization circuit. PFC, PWM controllers, if there is no visible damage or outright short circuits between pins, are checked by replacing with new or known good ones.

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

In such cases, the most likely faulty elements of LED panel backlight. The cause may be in the breakage of backlight LEDs, in their power supply stabilization, or in the violation of the contact connections of UF64_UHD_A 43INCH string connectors.
When diagnosing you should take into account that it is impossible to check the breakage in the circuit of the LED strings without disassembling the panel, using a tester or multimeter. To open all the PN-junctions connected in series, you will need a voltage of about several tens of volts, and ideally - a current source. After opening the panel, you can check each LED separately. Typically, Chinese multimeters will light up a single 3 volt LED slightly if you connect the probes to it in a forward direction. For twin 6 volt LEDs, the PN junction of its fault stabilizer can be a good indicator. If the LED is faulty, it will either be broken or shorted.

If LG 43UF640V has no picture, but there is sound, often the HC430DGG-SLNX1 display backlight simply does not work. Moreover, in LED TVs, the LEDs inside the panel usually fail, less often the LED driver.
In such cases, you can see a barely noticeable image when the external light hits the screen.

Replacing the LEDs requires disassembling the HC430DGG-SLNX1 LCD panel - a process that requires experience and qualifications from the master. We do not recommend doing such work on your own to TV owners and craftsmen who do not have experience in repairing LCD panels

If there is no image, and the backlight is on, the screen becomes slightly lighter when turned on, and in an open TV you can see the light through the holes in the panel case.
In this case, the panel may also be faulty - damage to the strips, loops, for example, as a result of moisture ingress after unsuccessful washing of the screen, the T-CON (Timing Controller) board may be faulty. But the main board MainBoard EAX66485504 (1.0) often turns out to be faulty, a software failure is also possible.
Then, first of all, you need 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 the normal range, it is necessary to trace the passage of LVDS signals from MainBoard EAX66485504 (1.0) with an oscilloscope, as well as synchronization signals to loops with drivers.

Flooded or unsuccessfully washed screens of LED TVs can be restored, in about half of the cases, usually if significant damage has not formed in the loops and panel strips


- 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 EAX66485504 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. In some cases to repair the MB board (SSB) you may need to replace the chips - CPU, eMMC, DRAM, DC/DC, AUDIO with new or known good ones. In cases where BGA technology is used, the defects are usually localized by the heating method.

Before you replace the TDJM-G301D EBL61560001 tuner if there is no tuning to the channels you should first check the software and the supply voltage on its outputs. Also you have to check the data exchange between the tuner and the processor via the I2C bus.

Please remember! Attempts to repair LG 43UF640V TV-set by yourself, in the absence of the necessary skills and experience are strongly not recommended and are fraught with negative consequences, up to the complete unusable device!

Driver current limit after backlight replacement. Information from the master.

You can reduce backlight current from 480 mA to 245 mA by removing one of each pair of low resistance current sensor resistors at the source of the converter keys (R811+R812 and R829+R830) on the EAX66472001 board.

DOWNLOAD SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>   CHASSIS : LD59R / LD5ZR  for models: 43UF640*, 49UF640*, 43/49UF640*-ZA, 43UF6407, 43UF640V, 49UF6407, 49UF640V.  

The appearance of the MainBoard EAX66485504 is shown in the figure below:

EAX66485504

MainBoard Appearance

The main features of the LG 43UF640V:

A matrix (LED panel) HC430DGG-SLNX1-211X is installed.
Timing Controller (T-CON) 6870C-0647A is used to control the matrix.
A converter combined with the main board EAX66485504 is used to power the backlight LEDs. As power elements of LED-driver are used TO-220F-type switches.
EAX66472001 power supply module or its analogues with the use of PFC and PWM chips (SSC3S921) and TO-220, TO252 power keys are used for generating necessary power supply voltages for all LG 43UF640V TV sets assemblies.
MainBoard - the main board (motherboard) is an EAX66485504 module, using CPU, eMMC, DRAM, DC/DC, AUDIO and other microchips.
The TDJM-G301D EBL61560001 tuner provides TV program reception and channel tuning.

Instructions and updates

There are files to download for the 43UF640V model from the manufacturer:

Files with updates and instructions:
File Description File Name Type Date Size
SW File (Version 03.16.00). Update instruction TV_Software_Update_Guide_v3.pdf PDF 18.06.2020 2014K
SW File (Version 03.16.00). Firmware (USB) Software_File (Version_03.16.00) .zip ZIP 06/18/2020 515617K
Compatible with 43UF6407-ZA, 43UF6409-ZA, 43UF640V-ZA, 49UF6407-ZA, 49UF6409-ZA, 49UF640V-ZA.
SW File (Version 03.15.50) for 43UF640V-ZA, 49UF640V-ZA, 43UF6407-ZA, 49UF6407-ZA. Update instructions TV_Software_Update_Guide_v3.pdf PDF 09.11.2017 1938K

User Manuals and Instructions:
Document Language Date Size
Quick Start Guide English - English, Estonian, Latvian, Lettish, Lithuanian, Russian 24/11/2015 13420K
Quick Start Guide English - English, Estonian, Latvian, Lettish, Lithuanian, Russian 24/11/2015 No data
User manuals English - English, Estonian, Latvian, Lettish, Lithuanian 08/09/2015 22 781K

Files can be downloaded on the manufacturer's website for the 43UF640V model.


LG 43UF640V TV with HC430DGG-SLNX1 LCD display, measuring 43" (109 cm) diagonally. (109 cm) in 16:9 aspect ratio. The display technology of this model features LED backlighting.
HC430DGG-SLNX1 matrix and MainBoard software EAX66485504(1.0) are able to realize the image in the highest quality UHD at 3840x2160 pixels in 4K UHD standard.
The 43UF640V has built-in SMART software and webOS Operating System. Connection to the network can be made via Wi-Fi wireless connection. 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, 2160p. Supported multimedia file formats are MP3, WMA, MPEG4, DivX, JPEG. Stereo sound is realized by two built-in speakers. A NICAM stereo sound processing system is used and the Sound Surround surround sound function.
Communication with other devices through an external interface is supported by standard input and output connectors: antenna input (RF), AV, audio x2, component, HDMI x2, USB, Ethernet (RJ-45), Wi-Fi. To connect a computer or laptop to this model of TV there is a VGA (D-Sub 15) connector. This interface supports standard resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768, 1920x1080, 3840x2160. The digital tuner is capable of receiving television channels in the standards DVB-T, DVB-T2, DVB-C, DVB-S2.

The TV uses the EAX66472001(1.5) power supply.

Dimensions: C stand 975x621x209 mm, No stand 975x582x81 mm.

Warning. The HC430DGG-SLNX1 is an expensive and fragile part of your LG 43UF640V LED TV.
Do not allow any impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
Also it is not safe to get liquid on the screen. Sometimes one drop is enough if it drips down the glass onto the cables and the TV becomes unrepairable.

REPAIRING / SERVICING TV LG 43UK6450PLC

Technical description and composition of LG 43UK6450PLC TV, type of panel and modules used. Module composition.

LG LED
Model: 43UK6450PLC 43UK6450

Chassis/Version: LJ8 Chassis

Panel: AC430DGG-SLEM1

LED backlight: LC43490086A

LED driver (backlight): integrated into MainBoard

PWM LED driver: LC5910

MOSFET LED driver: KF9N25

Power Supply (PSU): EAX67209001 LGP43DJ-17U1

PWM Power: PFC, PWM

MOSFET Power: TO-252

MainBoard: EAX67872805 (1.1) EBU65273804

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

TDJA-G601D

Specifications 43UK6450
LG 43UK6450PLC
General advice about LCD LED TV repair
Possible malfunctions

- LG 43UK6450PLC TV does not turn on. There are no indications of operation. The indicators on the front panel are not lit or blinking, the TV does not respond to the control buttons.

In such cases the main problem is the power supply module EAX67209001. If there are no necessary supply voltages in the converters secondary circuits, check the power switches (TO-252) and rectifier diodes for possible partial or complete breakdown.
If there is a breakdown in the secondary circuits, the inverter can usually be short-circuited, and a short in the power elements of the primary circuit will usually blow the mains fuse.
Mos-Fet power switches used in switching power supplies sometimes fail due to the failure of any other elements that can take it out of key mode, or create an exceedance of the maximum allowable parameters of the switch. These can be the elements that feed the PWM controller, the frequency or damping circuits, or the negative feedback elements in the stabilization circuit. PFC, PWM controllers, if there is no visible damage or outright short circuits between pins, are checked by replacing with new or known good ones.

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

Often in such cases there is no backlighting of the LED panel. Often the reason is a faulty LED (breakage, short circuit...), or connectors of strips LC43490086A, less often faulty is the LED-driver.
To check the LED strips for breakage without disassembling the panel can help, for example, a power source. It is not possible to open the series connected PN-junctions with a simple multimeter, you will need a voltage of about several tens of volts.

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

Repair or diagnostic of motherboard EAX67872805 should be started with checking stabilizers and power converters needed to power the chips and matrix. If necessary, software (software) should be updated or replaced. In cases of complicated MB (SSB) repairs and with the necessary skills and equipment it may sometimes be necessary to replace its CPU, eMMC, DRAM, AUDIO, DC/DC chips and other possible defective components. BGA soldering problems are usually easy to diagnose with the heating method.

Before replacing the TDJA-G601D tuner if there is no tuning to the channels you must first check the software and the power supply voltages on its outputs. Also make sure that the tuner and the processor can communicate via the I2C bus.

Warning. I strongly recommend for the users and owners of TV sets 43UK6450PLC, having no qualification, knowledge and experience not to try to do the repair works themselves in order to avoid the negative consequences which can lead to the complete uselessness of the device.

Restriction of the driver current after the replacement of the backlighting strips (violet glow, phosphor crumbling). Wizard's comments.

You can reduce the backlight current from 660 mA to 380 mA by replacing the 0.8 Ohm current sense resistor with a 1.2 Ohm current sense resistor at the source of the switch.
Backlight driver current limitation. LC5910. General recommendations.

To reduce the backlight current in LED drivers with the LC5910 step-down controller, you can increase the current sensor resistance at the source of the converter's power switch proportionally.

DOWNLOAD SCHEMATIC DIAGRAM  BACKLIGHT DRIVER   ------------------>    LC5910S

The appearance of the MainBoard EAX67872805 is shown in the figure below:

EAX67872805

MainBoard Appearance

The main features of the LG 43UK6450PLC:

The matrix (LED panel) AC430DGG-SLEM1 is installed.
To power the backlight LEDs is used a converter, combined with the main board EAX67872805, controlled by a PWM controller LC5910. KF9N25 type switches are used as power elements of LED-driver.
 

 

 

Necessary supply voltages for all LG 43UK6450PLC TV nodes are generated by EAX67209001 power supply module or its analogues using PFC, PWM and TO-252 type power keys.
MainBoard - the main board (motherboard) is EAX67872805 module, using CPU, eMMC, 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 43UK6450PLC model from the manufacturer:

Update and instruction files:
File Description File Name Type Date Size
SW File (Version 05.20.15) . TV_Software_Update_Guide_v3.pdf PDF 11.11.2020 2014K update instructions
SW File (Version 05.20.15) . Firmware (USB) Software_File(Version_05.20.15).zip zip 11.11.2020 884809K
Compatible with 43UK6200PLA, 43UK6300LLB, 43UK6300MLB, 43UK6300PLB, 43UK6390PLG, 43UK6400PLF, 43UK6450PLC, 43UK6470PLC, 43UK6500LLA, 43UK6500MLA, 43UK6500PLA, 43UK6510PLB, 43UK6550PLD, 43UK6710PLB, 43UK6750PLD, 43UK6950PLB, 49UK6200PLA, 49UK6300MLB, 49UK6300PLB, 49UK6390PLG, 49UK6400PLF, 49UK6450PLC, 49UK6470PLC, 49UK7500PLC, 49UK7550LLA, 49UK7550MLA, 49UK7550PLA, 50UK6300LLB, 50UK6300MLB, 50UK6300PLB, 50UK6410PLC, 50UK6470PLC, 50UK6500LLA, 50UK6500MLA, 50UK6500PLA, 50UK6510PLB, 50UK6710PLB, 50UK6750PLD, 50UK6950PLB, 55UK6200PLA, 55UK6300LLB, 55UK6300MLB, 55UK6300PLB, 55UK6400PLF, 55UK6470PLC, 55UK6500LLA, 55UK6500MLA, 55UK6500PLA, 55UK6510PLB, 55UK6550PLD, 55UK6710PLB, 55UK6750PLD, 55UK6950PLB, 55UK7500PLC, 55UK7550LLA, 55UK7550MLA, 55UK7550PLA, 60UK6200PLA, 65UK6300LLB, 65UK6300MLB, 65UK6300PLB, 65UK6400PLF, 65UK6450PLC, 65UK6470PLC, 65UK6500MLA, 65UK6500PLA, 65UK6710PLB, 65UK6750PLD, 65UK6950PLB, 65UK7550LLA, 65UK7550MLA, 65UK7550PLA, 70UK6500PLB, 70UK6710PLA, 70UK6950PLA, 75UK6200PLB, 75UK6500PLA, 75UK6750PLB.

Manuals and User Manuals:
Document Language Date Size
Quick start guide English - English 10.07.2020 6308K
Quick Start Guide English - English,Estonian,Latvian,Lettish,Lithuanian,Russian 07.14.2020 55 963K
Quick guide English - English,Estonian,Latvian,Lettish,Lithuanian,Russian 07.14.2020 No data

You can download the files for the model 43UK6450PLC from the manufacturer's website.


LG 43UK6450 LCD TV with AC430DGG-SLEM1, 42.5" (108 cm) diagonal, 16:9 aspect ratio. The required brightness of 250 cd/m² screen luminescence is provided by LED backlighting. Contrast, as the ratio of maximum brightness to minimum brightness, is 1300:1. The LCD panel implements the principle of direct display backlighting with the rear positioning of the LEDs - Direct LED.
AC430DGG-SLEM1 matrix and MainBoard software EAX67872805 are able to realize the image in the highest quality UHD at 3840x2160 pixels in 4K UHD, HDR standard. Image processing is made by modern technology High Dynamic Range (HDR) with an extended range of brightness gradation.
The model of TV 43UK6450 has built-in software (software) SMART and installed the operating system webOS. 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 sound speaker system has a capacity of 20 W (2x10 W) and is equipped with two loudspeakers. NICAM stereo sound processing system and Sound Surround surround function are used.
Communication with other devices via an external interface is supported by standard inputs and outputs: antenna input (RF), AV, component, HDMI x4, USB x2, Ethernet (RJ-45), Bluetooth, Wi-Fi 802.11ac, Miracast. The digital tuner is capable of receiving TV channels in DVB-T, DVB-T2, DVB-C, DVB-S, DVB-S2 standards.

The TV uses the EAX67209001 power supply.

Overall dimensions: with stand 977x636x224mm, without stand 977x575x81mm.

TV weight: with stand: 9.3 kg, without stand: 8.3 kg.

Warning. Panel AC430DGG-SLEM1 of LG 43UK6450 LED TV is an expensive and unreliable element of the TV.
Do not allow any impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
Also it is not safe to get liquid on the screen. Sometimes one drop is enough if it drips down the glass onto the cables and the TV becomes unrepairable.

REPAIRING / SERVICING TV LG 55LJ540V

Technical description and composition of LG 55LJ540V TV, type of panel and modules used. Module composition.

LG LED
Model: 55LJ540V

Chassis/Version: LJ7 CHASSIS

Panel: SDL550FY(CD0-901)

LED backlight: RF-AZ550E30-0501A/B-12A4

T-CON: ST5461B05-2-XC-2

LED driver (backlight): integrated into PSU

PWM LED driver: BD94121F

Power Supply (PSU): 168P-L6R021-W2

PWM Power: PFC, PWM

MOSFET Power: TO-220

MainBoard: EAX671296041 (1.0)(1.2T) 702L00FU-0001

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

MainBoard: TDJA-Q501D

Control: WIFI: TWFM-K008D

Specifications 55LJ540V
LG 55LJ540V
General advice about LCD LED TV repair
Possible malfunctions

- LG 55LJ540V TV does not turn on at all. Control lights are not glowing or blinking. TV does not respond to remote control and control panel buttons.

In some cases, the power module 168P-L6R021-W2 is defective. Then it is recommended to measure its output voltages, and in case of their absence you should check the serviceability of the power switches (TO-220) and the rectifier diodes of the converters for possible short circuit.
Any breakdowns in the secondary circuits may cause the inverter to operate in a short-circuit emergency mode, and shorting in the primary circuit power elements is more likely to cause the line fuse or current sensor at the source of the switch to blow.
Mos-Fet power switches used in switching 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 or damping circuits, or the negative feedback elements in the stabilization circuit. PFC, PWM controllers, if there is no visible damage or outright short circuits between pins, are checked by replacing with new or known good ones.

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

Usually in such cases there is no backlighting of the LED panel (matrix). More often the reason for this is a breakage of LEDs, or poor contact in the connectors of boards, less often faulty may be the LED-driver.
Remember that to determine the breakage in the LED lines 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 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.

- 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 motherboard EAX671296041 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. If you try to repair the MB board (SSB), it is necessary to check the condition of its elements - CPU, eMMC, DRAM, AUDIO, DC/DC, which may need to be replaced with new ones. If there is a BGA processor, there is a possibility of a breach of solder contacts with the board (this can be diagnosed by warming up).

If the LG 55LJ540V has no picture but has sound, often the display backlight of the SDL550FY(CD0-901) 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 faintly visible image when external light hits the screen.

To replace the LEDs requires disassembly of the LCD panel SDL550FY(CD0-901) - a process which requires the 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 EAX671296041 is defective as well, software failure is also possible.
Then first it is necessary to check the panel power supply voltage, fuses on the T-CON board, as well as the supply and reference voltages of the column and line drivers - VGH, VGL, Vcom.
If these measurements are within normal limits, it is necessary to trace LVDS signals from MainBoard EAX671296041, as well as synchronizing signals to driver stubs with oscilloscope.

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


If the TV set works normally from external devices, but does not tune to the TV channels, the TDJA-Q501D tuner might 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 can communicate via the I2C bus. Sometimes a software malfunction can be the cause of the malfunction.

Owners of a 55LJ540V television set should seek the assistance of a qualified technician with the necessary experience to perform the necessary repairs! Attempting to do it yourself without the necessary knowledge and skills can lead to irreversible negative consequences!

Current limitation after backlight repair. Information from the master.

To reduce backlight current from 500mA to 320mA you can remove the resistors R119 2.7 Ohm and R120 3.0 Ohm in the driver current sensor on the 168P-L6R021-W2 power supply board.
More on MainBoard Repair

The appearance of the MainBoard EAX671296041 is shown in the figure below:

EAX671296041

MainBoard Appearance

The main features of the LG 55LJ540V:

A matrix (LED panel) SDL550FY(CD0-901) is installed.
Timing Controller (T-CON) ST5461B05-2-XC-2 is used to control the matrix.
The converter combined with a power supply is used to power the backlight LEDs and is controlled by a BD94121F PWM controller.

The power supply module 168P-L6R021-W2 or its analogues with the use of PFC, PWM chips and TO-220 type power keys performs the formation of the necessary supply voltages for all LG 55LJ540V TV assemblies.
MainBoard - the main board (motherboard) is an EAX671296041 module, using CPU, eMMC, DRAM, AUDIO, DC/DC and other chips.
The TDJA-Q501D tuner provides TV program reception and channel tuning.



Instructions and updates

There are downloadable files for the 55LJ540V from the manufacturer:

Update and instruction files:
File Description File Name Type Date Size
SW File (Version 05.80.40) . TV_Software_Update_Guide_v3.pdf PDF 26.08.2020 2014K update instructions
SW File (Version 05.80.40) . Firmware (USB) Software_File(Version_05.80.40).zip zip 26.08.2020 805359K
Compatible with 32LJ590U-ZA, 32LJ594U-ZA, 32LJ610V-ZD, 32LJ622V-ZB, 43LJ594V-ZA, 43LJ595V-ZD, 43LJ610V-ZA, 43LJ614V-ZA, 43LJ622V-ZC, 43LJ624V-ZC, 49LJ540V-ZA, 49LJ594V-ZA, 49LJ595V-ZD, 49LJ610V-ZA, 49LJ614V-ZA, 49LJ622V-ZC, 49LJ624V-ZC, 55LJ540V-ZA, 55LJ615V-ZA, 55LJ622V-ZB, 55LJ625V-ZB.

Manuals and User Manuals:
Document Language Date Size
Quick Start Guide English - English,Estonian,Latvian,Lettish,Lithuanian,Russian 10.31.2019 55 631K
Quick Start Guide English - English,Estonian,Latvian,Lettish,Lithuanian,Russian 10.31.2019 No data
Quick start guide English 09.13.2017 4888K

You can download the files from the manufacturer's website for the 55LJ540V model.


LG 55LJ540V TV with SDL550FY(CD0-901) LCD screen, measuring 54.6" (139 cm) diagonally in 16:9 aspect ratio. The LCD panel implements the principle of direct display backlighting with a rear arrangement of LEDs - Direct LED.
SDL550FY (CD0-901) matrix and MainBoard software EAX671296041 provide for viewing shows and movies in high quality HD with 1920x1080 pixels in 1080p (Full HD) resolution.
Model 55LJ540V TV has built-in software (software) SMART and installed the operating system webOS. Connection to the network can be made via wireless Wi-Fi connection. Supported media formats: MP3, WMA, MPEG4, Xvid, MKV, JPEG.
The capacity of the sound system is 20 W (2x10 W), provided by two speakers. It uses NICAM stereo sound processing system and the Sound Surround surround function.
Communication with other devices via an external interface is supported by standard input and output connectors: antenna input (RF), AV, component, HDMI x2, USB, Ethernet (RJ-45), Wi-Fi 802.11ac, WiDi, Miracast. The digital tuner is capable of receiving TV channels in DVB-T, DVB-T2, DVB-C, DVB-S2 standards.

The TV uses a 168P-L6R021-W2 power supply.

Dimensions: with stand 1243x787x251 mm, without stand 1243x730x91 mm.

TV weight: with stand 14kg, without stand 13.7kg.

Warning. SDL550FY(CD0-901) panel of LG 55LJ540V LED TV is an expensive and unreliable part of it.
Do not allow 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 LG 55UK6200PLA

 Technical description and composition of LG 55UK6200PLA TV, type of panel and modules used. Module composition.

LG LED
Model: 55UK6200PLA

Chassis/Version: EAX67872805

Panel: HC550DGG-SLUL5-A14X.

LED backlight: ARRAY_REV0.0_180628_3PCM00796A

LED driver (backlight): integrated into PSU

PWM LED driver: LC5910

MOSFET LED driver: TO-252

Power Supply (PSU): EAX67865201 LGP55TJ-18U1

PWM Power: PFC, PWM

MOSFET Power: TO-252

MainBoard: EAX67872805 (1.1) EBT65339503

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

MainBoard: TDJA-G601D

Specifications 55UK6200
LG 55UK6200PLA
General recommendations for LCD LED TV repair
Possible Manifestations of Defects

- LG 55UK6200PLA does not turn on, the indicators on the front panel are not lit or blinking. TV on the control buttons and remote does not respond.

With such manifestations usually fails power module EAX67872805. In the absence of the necessary supply voltages in the secondary circuits of the converters, you must check the power switches (TO-252) and rectifier diodes for possible partial or complete breakdown.
If the diodes in the secondary circuits breakdown, the inverter can operate in the emergency short-circuit mode without output voltages, and if the power elements in the primary circuit are shorted, the mains fuse and/or the current sensor at the source of the key usually break down.
Breakdown of power switches (MosFet) in pulse sources is sometimes caused by faults in other circuit elements, e.g. in the circuits supplying the PWM controller, frequency-retaining or damping circuits, as well as in the Negative Feedback Stabilization (NFRS) circuits. PWM regulators (PFC) PFC, PWM, if they do not have visible case damage and outright short circuit between pins, are usually checked by replacement.

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

In some of these cases, the fault is caused by the lack of backlighting of the display. Often the cause is a faulty LED (breakage, short circuit...), or connectors of ARRAY_REV0.0_180628_3PCM00796A strips, 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 source for this purpose. You can check each LED individually with a simple Chinese multimeter (9 volt) in P-N junction 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 stabilizing diode is indirectly an indication of the functionality of the LED.

- LED blinks or lights constantly, TV set does not turn on, remote control is unresponsive.

Repair or diagnostic of motherboard EAX67872805 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. If you try to repair the MB board (SSB), it is necessary to check the functionality of its elements - CPU, eMMC, DRAM, AUDIO, DC/DC that may need to be replaced with new ones. If you have a BGA processor, there is a possibility that the solder contacts of the BGA processor may be broken with the board (this can be done by warming it up).

Before replacing the TDJA-G601D tuner, if there is no tuning to the channels, you must first check the software and the power supply voltage on its outputs. Also you need to check if the tuner and the CPU can communicate through the I2C bus.

Warning to the users! Independent repair of LG 55UK6200PLA TV without the relevant qualification and necessary experience can lead to its complete unrepairability!

 DOWNLOAD SCHEMATIC DIAGRAM BACKLIGHT DRIVER  ------------------>   LC5910S

 

Repair after repair of backlight. Information from the master.

Decrease backlight current from 480 mA to 250 mA - replaced the resistor (current sensor) R801 1 Ohm with 1.5 Ohm on the power supply board EAX67865201.
Backlight driver current limitation. LC5910. General recommendations.

To reduce the backlight current in LED drivers with the LC5910 step-down controller, you can proportionally increase the current sensor resistance at the source of the converter power switch.

 

The appearance of the MainBoard EAX67872805 is shown in the figure below:

EAX67872805

MainBoard Appearance

The main features of the LG 55UK6200PLA:

HC550DGG-SLUL5-A14X matrix (LED panel) is installed.
For the power supply of backlight LEDs used converter, combined with a power supply, controlled by LC5910 PWM-controller. As the power elements of the LED-driver switches of TO-252 type are used.
Formation of necessary supply voltages for all LG 55UK6200PLA TV nodes is made by the power module EAX67865201, or its analogues using PFC, PWM and power switch type TO-252.
MainBoard - the main board (motherboard) is an EAX67872805 module, using CPU, eMMC, 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 55UK6200PLA model from the manufacturer:

Update and instruction files:
File Description File Name Type Date Size
SW File (Version 05.20.15) . TV_Software_Update_Guide_v3.pdf PDF 11.11.2020 2014K update instructions
SW File (Version 05.20.15) . Firmware (USB) Software_File(Version_05.20.15).zip zip 11.11.2020 884809K
Compatible with 43UK6200PLA, 43UK6300LLB, 43UK6300MLB, 43UK6300PLB, 43UK6390PLG, 43UK6400PLF, 43UK6450PLC, 43UK6470PLC, 43UK6500LLA, 43UK6500MLA, 43UK6500PLA, 43UK6510PLB, 43UK6550PLD, 43UK6710PLB, 43UK6750PLD, 43UK6950PLB, 49UK6200PLA, 49UK6300MLB, 49UK6300PLB, 49UK6390PLG, 49UK6400PLF, 49UK6450PLC, 49UK6470PLC, 49UK7500PLC, 49UK7550LLA, 49UK7550MLA, 49UK7550PLA, 50UK6300LLB, 50UK6300MLB, 50UK6300PLB, 50UK6410PLC, 50UK6470PLC, 50UK6500LLA, 50UK6500MLA, 50UK6500PLA, 50UK6510PLB, 50UK6710PLB, 50UK6750PLD, 50UK6950PLB, 55UK6200PLA, 55UK6300LLB, 55UK6300MLB, 55UK6300PLB, 55UK6400PLF, 55UK6470PLC, 55UK6500LLA, 55UK6500MLA, 55UK6500PLA, 55UK6510PLB, 55UK6550PLD, 55UK6710PLB, 55UK6750PLD, 55UK6950PLB, 55UK7500PLC, 55UK7550LLA, 55UK7550MLA, 55UK7550PLA, 60UK6200PLA, 65UK6300LLB, 65UK6300MLB, 65UK6300PLB, 65UK6400PLF, 65UK6450PLC, 65UK6470PLC, 65UK6500MLA, 65UK6500PLA, 65UK6710PLB, 65UK6750PLD, 65UK6950PLB, 65UK7550LLA, 65UK7550MLA, 65UK7550PLA, 70UK6500PLB, 70UK6710PLA, 70UK6950PLA, 75UK6200PLB, 75UK6500PLA, 75UK6750PLB.

Manuals and User Manuals:
Document Language Date Size
Quick Start Guide English - English,Estonian,Latvian,Lettish,Lithuanian,Russian 09.03.2020 56 324K
Quick Start Guide English - English,Estonian,Latvian,Lettish,Lithuanian,Russian 09.03.2020 No data
Quick start guide English - English 10.30.2018 4067K

You can download the files from the manufacturer's website for the model 55UK6200PLA.

LG 55UK6200 TV with HC550DGG-SLUL5-A14X LCD screen, measuring 54.6" (139 cm) diagonally 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.
HC550DGG-SLUL5-A14X matrix and MainBoard software EAX67872805 are able to realize the image in the highest quality UHD at 3840x2160 pixels in 4K UHD, HDR standard. Image processing is made by modern technology High Dynamic Range (HDR) with an extended range of brightness gradation.
The model of TV 55UK6200 has built-in software (software) SMART and installed the operating system webOS. Connection to the network can be made via Wi-Fi. Supported media formats: MP3, WMA, MPEG4, HEVC (H.265), DivX, MKV, JPEG.
The sound speaker system has a capacity of 20 W (2x10 W) and is equipped with two loudspeakers. NICAM stereo sound processing system and Sound Surround surround function are used.
Communication with other devices via an external interface is supported by standard inputs and outputs: antenna input (RF), AV, component, HDMI x3, USB x2, Ethernet (RJ-45), Bluetooth, Wi-Fi 802.11ac, Miracast. The digital tuner is capable of receiving TV channels in DVB-T, DVB-T2, DVB-C, DVB-S, DVB-S2 standards.

The TV uses the EAX67865201 power supply.

Overall dimensions: with stand 1247x783x235 mm, without stand 1247x728x88 mm.

TV weight: with stand: 13.3 kg, without stand: 13.2 kg.

Warning. The panel HC550DGG-SLUL5-A14X of LG 55UK6200 LED TV is an expensive and unreliable element of the TV.
Do not allow any 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.

PANASONIC TC-L32E5 HOW TO ENTER THE SERVICE MODE, LED BLINKING CODES, POWER BOARD ELECTRIC SCHEMATIC DIAGRAM

 

Chassis: LA35  Destination: USA.  AC 110-127 V, 60 Hz

1. Do not press panel surface to avoid blue spot on the panel display.

2. Do not use hard cloth or rub the surface too hard. This may cause scratches on the surface.

3. Take care not to subject the TV’s surface to water or detergent. Any liquid (including pets urine) if enters the product could lead to TV failure.

4. Take care not to subject the surface to insect repellent, solvent, thiner or other voiltile substances. This may degrade surface quality or cause peeling of the paint.

5. The surface of the display panel is specially treated and may be easily damaged. Take care not to tap or scratch with your fingernail or other hard objects.

Service Mode:  How to enter into Service Mode

While pressing [VOLUME ( - )] button of the main unit, press [INFO] button of the remote control three times within 2 seconds.

Contents of adjustment mode

 Value is shown as a hexadecimal number.

 Preset value differs depending on models.

 After entering the adjustment mode, take note of the value in each item before starting adjustment.

How to exit

Switch off the power with the [POWER] button on the main unit or the [POWER] button on the remote control.

SRV-TOOL:  How to access

1. Select [SRV-TOOL] in Service Mode.

2. Press [OK] button on the remote control.

Display of SOS History

SOS History (Number of LED blinking ) indication.

From left side; Last SOS, before Last, three occurrence before, 2nd occurrence after shipment, 1st occurrence after shipment.

This indication except 2nd and 1st occurrence after shipment will be cleared by [Self-check indication and forced to factory shipment setting].

POWER ON TIME/COUNT

Note : To display TIME/COUNT menu, highlight position, then press MUTE for 3sec.

Time : Cumulative power on time, indicated hour : minute by decimal

Count : Number of ON times by decimal

Note : This indication will not be cleared by either of the self-checks or any other command.

Exit

Disconnect the AC cord from wall outlet.

Self Check Mode

1. Press the ‘MENU’ button (on the remote control) and the ‘VOL DOWN’ button on the LCD panel.

2. Press ON/OFF button on the panel to Exit.

Hotel Mode Adjustment

1. Press the ‘VOLUME DOWN’ button on the TV panel and simultaneously press the INPUT button on the remote control 3 times to enter Hotel Mode.

2. Set Hotel mode ‘on/off’, then press ‘EXIT’ to come out.

Hotel Mode

1. Purpose

Restrict a function for hotels.

2. Access command to the Hotel mode setup menu.

In order to display the Hotel mode setup menu, please enter the following command (within 2 second). [TV] : Vol [Down] + [REMOTE] : INPUT (3 times).

Then, the Hotel mode setup menu is displayed.

3. To exit the Hotel mode setup menu

Disconnect AC power cord from wall outlet.

4. Explain the Hotel mode setup menu

Troubleshooting Guide

Use the self-check function to test the unit.

1. Checking the IIC bus lines

2. Power LED Blinking timing

Check of the IIC bus lines:  How to access

Self-check indication only:

Produce TV reception screen, and while pressing [VOLUME ( - )] button on the main unit, press [OK] button on the remote control for more than 3 seconds.

Self-check indication and forced to factory shipment setting:

Produce TV reception screen, and while pressing [VOLUME ( - )] button on the main unit, press [MENU] button on the remote control for more than 3 seconds.

Exit

Disconnect the AC cord from wall outlet.

Screen display

Power LED Blinking timing chart

1. Subject

Information of LED Flashing timing chart.

2. Contents

When an abnormality occurs, the protection circuit will operate and reset the unit to stand by mode. During this time, the defective block can be identified by the number of blinking times of the Power LED on the front panel of the unit as follow:

No Power

First check point

There are following 2 states of No Power indication by power LED.

1. No lit

2. Red is lit then turns red blinking a few seconds later.

Voltage chart of A-Board and P-Board

Power board PWB

P-Board Schematic Diagram [TNPA5596CP]

REPAIRING / SERVICING TV SAMSUNG UE50F5000

 Technical description and composition of SAMSUNG UE50F5000 TV, type of panel and modules used. Module composition.

SAMSUNG LED
Model: UE50F5000 UE50F5000AK

Chassis/Version: BN41-01955A

Panel: T500HVF02.5

LED driver (backlight): integrated into PSU

PWM LED driver: SLC5012M (MAP3312B)

Power Supply (PSU): BN44-00612A L55S1_DSM

PWM Power: Stb, PFC, PWM

MOSFET Power: TO-220, TO252

MainBoard: BN41-01955A BN94-06273H

IC MainBoard: CPU: SEMS29, SPI Flash: W25Q40BL, EEPROM: 24C256C, SOUND: NTP7412S

Specifications: BN40-00256A

Specifications UE50F5000
SAMSUNG UE50F5000
General advice for LCD LED TV repair
Possible defects

- SAMSUNG UE50F5000 TV does not turn on, does not respond to remote and control panel buttons, does not glow or blink indicators.

The power module BN44-00612A usually fails with these manifestations. If there are no necessary supply voltages in inverter secondary circuits, it is necessary to check power switches (TO-220, TO252) and rectifier diodes for possible partial or complete breakdown.
In case of diode breakdown in the secondary circuits, the inverter may operate in the emergency short-circuit mode without output voltages, and in case of short-circuits in the power elements of the primary circuit, the mains fuse and/or the current sensor in the source of the key are usually blown.
The breakdown of power switches (MosFet) in switching supplies is sometimes caused by faults in other circuit elements, e.g. in the circuits supplying the PWM controller, the frequency pickup or damping circuits, as well as in the negative feedback (NF) stabilisation circuits. PWM regulators (PWM) Stb, PFC, PWM, unless they have visible housing damage and outright short circuits between pins, are usually checked by replacement.

- 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.

The fault in these cases is usually most likely in the backlighting nodes of the display matrix. 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.
To check the LED circuit, it is best to use a power supply with a maximum voltage of 200V. It is not recommended to use any voltage source for this purpose. You can check each LED individually with a simple Chinese multimeter (9 volt) in P-N junction mode. If you connect the red probe of the multimeter to the anode of the LED and the black probe to its cathode, the 3 V LED will light up slightly and in the opposite direction you can find the junction of the faulty regulator. The functionality of the PN junction is indirectly an indication of the functionality of the LED.

If the SAMSUNG UE50F5000 has no picture but has sound, often the T500HVF02.5 display backlight is simply not working. Moreover, in LED TVs the LEDs inside the panel usually fail, more rarely the LED driver.
In such cases, you may see a faintly visible image when external light hits the screen.

Replacing the LEDs requires disassembly of the T500HVF02.5 LCD panel and this process requires a lot of experience and expertise. Do not attempt this procedure yourself; it is not recommended for TV owners or craftsmen without 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 you can see the light through the holes in the panel body when the TV is open.
In this case the panel may be defective - damage to the boards, 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 BN41-01955A is defective, software defects are also possible.
The first thing to check is the panel supply voltage, the fuses on the T-CON board, and the supply and reference voltages of the column and line drivers - VGH, VGL, Vcom.
If the measurements are within normal limits, you need to trace with an oscilloscope the LVDS signals from MainBoard BN41-01955A, as well as synchronizing signals to the driver stubs.

Flooded or badly 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 strips.

- Front panel LED is blinking, TV set does not switch into operation, remote control is unresponsive.

Repair or diagnostic of motherboard BN41-01955A should be started with checking stabilizers and power converters necessary to power the microcircuits and matrix. If necessary, the software (firmware) should be updated or replaced. In some cases to repair MB board (SSB) you may need to replace CPU: SEMS29, SPI Flash: W25Q40BL, EEPROM: 24C256C, SOUND: NTP7412S with new or known good ones. In cases of BGA technology, defects are usually located by heating.

Before replacing the BN40-00256A tuner, if it is not possible to tune to TV channels, make sure that the supply voltages are available, which should be measured at the respective pins of the tuner and the software should be checked for correctness. The communication pulses between the tuner and the processor can be checked with an oscilloscope.

I recommend for UE50F5000 TV owners to apply only to the qualified and experienced technicians for any repairs! Attempts to repair without proper knowledge and skills can lead to irreparable negative consequences!

 

 DOWNLOAD SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>    Chassis: U85B/ U85C2  FOR MODELS  UE22F5000A, UE32F5000A, UE39F5000A, UE40F5000A, UE42F5000A, UE46F5000A, UE50F5000A, UE32F5020AK, UE39F5020AK, UE42F5020AK, UE46F5020AK, UE50F5020AK, UE32F5070SS, UE46F5070SS, UE32F4000AW, UE32F4020AW, UE32F4800AW. .

 

Repair of backlighting after repair. Information from the master.

Reduce backlight current from 240 mA to 160 mA. The BN44-00612A board has 3.6 Ohm resistors R9121 and R9221 in the current sensors of both driver channels. Replaced each with 5.1 Ohm.

 The exterior of the MainBoard BN41-01955A is shown in the illustration below:

BN41-01955A

The BN41-01955A can be used in televisions:

SAMSUNG UE32F5000AK (Panel CY-HF320BGSV1V), SAMSUNG UE32F5020AK (Panel T320HVF03.0), SAMSUNG UE42F5000AK UE42F5000 (Panel HF420BGA-B1), SAMSUNG UE46F5000AK UE46F5000 (Panel CY-HF460BGLV1V), SAMSUNG UE32F4800AW UE32F4800 (Panel CY-HF320AGLV2V).

Power Supply Appearance

The main features of the SAMSUNG UE50F5000:

A matrix (LED panel) T500HVF02.5 is installed.
The converter combined with the power supply is applied for powering of backlighting LEDs and is controlled by PWM controller SLC5012M (MAP3312B).
The power supply module BN44-00612A or its analogues with the use of Stb, PFC, PWM chips and TO-220, TO252 power keys generates the necessary power supply voltages for all the SAMSUNG UE50F5000 TV assemblies.
MainBoard - the main board (motherboard) is BN41-01955A module, using CPU: SEMS29, SPI Flash: W25Q40BL, EEPROM: 24C256C, SOUND: NTP7412S and other microchips.
The BN40-00256A tuner allows you to receive TV programmes and tune to channels. 

There are downloads available for the UE50F5000AKXXU from the manufacturer:

Latest software updates, firmwares (latest firmwares):
File type File name Version date Size
Update file (USB) T-MST13DEUC_1024.2.exe 1024.2 07.10.2015 37.97 Mb

Firmware Update User Manual 2013_TV_Firmware_Upgrade_Instruction.pdf 1.0 07.10.2015 0.41 Mb

User Manuals (User Manuals):
File type File name Version Date Size

Installation Guide UF4000-EU_BN68-04898L-03ENG-0219.pdf - 02.09.2015 0.01 Mb
Installation Guide UF5000-EU_BN68-04898M-02ENG-0228.pdf - 03.09.2015 0.01 Mb
User manual [WEB]X13DVBEU1F-ENG.pdf 1.0 07.03.2013 4.34 Mb

You can download the files for model UE50F5000AKXXU  from the manufacturer's website.

The SAMSUNG UE50F5000 LCD TV T500HVF02.5 has a 50" (127cm) diagonal 16:9 aspect ratio. This model's display technology uses LED backlighting.
The T500HVF02.5 matrix and MainBoard software BN41-01955A enable high definition viewing of shows and movies at 1920x1080 resolution in 1080p (Full HD). Input analogue video signal is decoded in PAL, SECAM, NTSC systems. The graphic processing of a digital signal is done in 480i, 480p, 576p, 720p, 1080i, 1080p. Supported multimedia file formats are MP3, WMA, MPEG4, DivX, MKV, JPEG.
The sound system has a capacity of 20 W (2x10 W) with two loudspeakers. 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. A headphone jack is provided. A VGA (D-Sub 15) connector is provided to connect a computer or notebook computer to the TV set. This interface supports the standard resolution: 640x480, 1920x1080. The digital tuner is capable of receiving DVB-T, DVB-T2, DVB-C TV channels.

The power consumption in mains mode is 64W. The power supply BN44-00612A.

Overall dimensions: with stand 1135x728x235 mm., without stand 1135x668x50 mm.

TV weight: with stand: 14.5 kg, without stand: 13 kg.

Warning. The panel T500HVF02.5 of SAMSUNG UE50F5000 LED TV is expensive and not durable.
Avoid any kind of 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 a single drop is enough if it drips down the glass onto the cables to render the television unrepairable.