Technical description and composition of the LG 43LJ510V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 43LJ510V
Chassis / Version: LD76H
Panel: LC430DUE (FJ) (A1)
LED backlight: 6916L-2743B 43 V16.5 ART3 2743 Rev0.02
T-CON: 6870C-0532B
LED driver (backlight): integrated into MainBoard
PWM LED driver: MP3378E
MOSFET LED driver: AOD2922
Power Supply (PSU): Adapter 19V 3.42A
MainBoard: EAX67041506 (1.2) RS7DL31F1C
IC MainBoard: LGE6351, H27U1G8F
Tuner: TDJA-G501D
Control: IR: EBR83592901 UJ51_Ver1.0
Specifications 43LJ510V
LG 43LJ510V
General repair guidelines for TV LCD LED
Possible malfunctions
- LG 43LJ510V does not turn on and does not show any signs of performance at all. Does not blink indicators and does not respond to control buttons.
In such cases, the adapter power supply is usually faulty.
The external adapter 19V 3.42A power supply is not always subject to repair, especially since the owner can purchase it independently. But, in some cases, it makes sense to open it and eliminate the simple typical defects inherent in converters in pulsed sources. It is necessary to verify the presence of its output voltages and, if they are completely absent, check the power switches and rectifier diodes for a probable short circuit.
In the event of breakdowns in the secondary circuits of the converter, it can usually fail in short circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse or current sensor at the source of the key most often breaks.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback (OOS) stabilization circuits. PWM controllers (PWM), if they do not have visible damage to the case and open short circuit between the terminals, are usually checked by replacement.
- There is no image, but there is sound, it reacts to the remote control. Or the image appears when you turn it on and immediately disappears
The most likely in these cases is a malfunction of the LED backlight. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
It is impossible to check the LED line for breaks without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts will be required, and ideally, a current source. Having disassembled the panel, it is necessary to check each LED separately. Chinese multimeters, as a rule, light up a single 3-volt LED in the forward direction. In the case of using dual 6-volt LEDs, the PN junction of its protective zener diode can serve as a health indicator. In faulty LEDs, the zener diode will either be cut off or broken into short-circuit.
- The indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the EAX67041506 motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - LGE6351, H27U1G8F and replace failed chips with new ones. Some malfunctions can be associated with the use of BGA soldering technologies in modern Main Board. Typically, such defects are detected by local heating of the chip.
Before changing the tuner TDJA-G501D, if there is no possibility of tuning to television channels, you should make sure that there are supply voltages that must be measured at the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
Attention to users! Self-repair of the LG 43LJ510V TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
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 (RISET) to the chassis. 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.
FIRMWARE SPI FLASH, NAND FLASH -----> LG LD76H Main: EAX67041506 (1.2)
The appearance of the MainBoard EAX67041506 is shown in the figure below:
EAX67041506
Main features of the device LG 43LJ510V:
Installed matrix (LED-panel) LC430DUE (FJ) (A1).
The matrix control uses the Timing Controller (T-CON) 6870C-0532B.
To power the backlight LEDs, a converter is used, combined with the EAX67041506 main board, controlled by the MP3378E PWM controller. As power elements of the LED driver, keys of the AOD2922 type are used.
To power all the internal components of the LG 43LJ510V TV, an external adapter type 19V 3.42A is used.
MainBoard - the main board (motherboard) is an EAX67041506 module, using LGE6351, H27U1G8F chipsets and others.
The TDJA-G501D tuner provides television reception and channel tuning.