Technical description and composition of the LG 43LH570V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 43LH570V
Chassis / Version: LD66L / Z LA66L
Panel: HC430DUN-SLVX1-511X
LED backlight: 43LH51 FHD A Type L / R
T-CON: 6870C-0532A
LED driver (backlight): integrated into PSU
Power Supply (PSU): EAX66851301 (1.5) EAY64310501 LGP43DS1-16CH1
MainBoard: EAX66873003 (1.0)
Tuner: TDJA-G301D
Control: Wi-Fi: TWFM-B006D
Specifications 43LH570V
LG 43LH570V
General repair guidelines for TV LCD LED
Possible malfunctions
- The LG 43LH570V TV does not turn on, the indicators on the front panel do not light or flash. The remote control does not respond to the control buttons.
Often in such cases, the EAX66851301 power module is faulty. It is necessary to measure the secondary output voltage, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for a short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during short circuit in the elements of the primary circuit, the mains fuse usually breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization. The reason for the breakdown of the power key may be PWM IC_Power. It is checked only by replacement with a known good one.
- There is no image, there is sound, it responds to the remote. Or the image may appear for a second when turned on and immediately disappears.
The defect can be caused by problems in the nodes or elements of the backlight of the display, or in the power supply of the lamps or inverter. If all the electrolytic capacitors of the filter according to the power supply of the inverter are working, make sure that the lamps are working, then you need to check the converter keys and the secondary windings of the transformers.
Sometimes, for diagnostic purposes, inverter protection must be disabled. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- The TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the EAX66873003 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).
If there is no reception of television channels, but the TV is working properly from external devices, first of all you need to check the voltage of the tuner tuner and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Entrust repair to professionals with sufficient experience in the field of repair of electronic equipment.
SCHEMATIC DIAGRAM ---------------> LG 43LH570V Chassis LA66L/Z
CHASSIS : LA66L; MODEL : 43LH570*, 43LH570*-U*, 49LH570*, 49LH570*-U*
The appearance of the MainBoard EAX66873003 is shown in the figure below:EAX66873003
EAX66873003 can be used in TVs:
LG 43LH570V (Panel HC430DUN-SLVX1-511X), LG 43LH590V (Panel HC430DUN-SLVX1-511X).
The appearance of the power supply
Main features of the device LG 43LH570V:
Installed matrix (LED panel) HC430DUN-SLVX1-511X.
The matrix control uses the Timing Controller (T-CON) 6870C-0532A.
To power the backlight LEDs, a converter is used, combined with a power supply.
The formation of the necessary supply voltages for all nodes of the LG 43LH570V TV is carried out by the EAX66851301 power module, or its analogues.
MainBoard - the main board (motherboard) is an EAX66873003 module.
The TDJA-G301D tuner provides TV reception and channel tuning.