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.