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.