Technical description and composition of the LG 43LJ594V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 43LJ594V
Chassis / Version: UD63P EAX66804605
Panel: HC430DUN-SLTL1-911X
LED backlight: 43INCH UHD_LED ARRAY_A / B-TYPE_161024
LED driver (backlight): integrated into PSU
MOSFET LED driver: TO-252
Power Supply (PSU): EAX67264001 (1.5) EAY64530001 LGP43DJ-17F1
PWM Power: PFC, PWM
MOSFET Power: TO-252
MainBoard: EAX66804605 (1.1) EBT64202213
Tuner: TDJN-G301D
Specifications 43LJ594V
LG 43LJ594V
General repair guidelines for TV LCD LED
Possible manifestations of defects
- LG 43LJ594V 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 fault should be sought first in the EAX67264001 power supply module. It is necessary to measure its output voltages, and in case of their absence (full or partial), it is necessary to check the serviceability of power switches (TO-252) of converters and rectifier diodes for the presence of a possible short circuit.
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse usually 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) PFC, PWM, if they do not have visible damage to the case and open fault 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 faulty usually in these cases is the backlight matrix (LED-panel). The reason may be a break in the LEDs, in the stabilization of their power supply, or in the violation of the contact connections of the strings,
When trying to detect a break in the LED lines, it should be taken into account that it is difficult to do this without disassembling the panel. For example, a current source is needed to open PN junctions connected in series.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the EAX66804605 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).
The TDJN-G301D tuner malfunction is established after checking the software and all supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
It should be remembered! Attempts to independently repair the LG 43LJ594V TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
The appearance of the MainBoard EAX66804605 is shown in the figure below:EAX66804605
The appearance of the power supply
Main features of the device LG 43LJ594V:
Installed matrix (LED panel) HC430DUN-SLTL1-911X.
To power the backlight LEDs, a converter is used, combined with a power supply. As power elements of the LED driver, keys of the TO-252 type are used.
The necessary supply voltages are generated for all nodes of the LG 43LJ594V TV by the EAX67264001 power module or its analogs using PFC, PWM microcircuits, and TO-252 type power switches.
MainBoard - the main board (motherboard) is an EAX66804605 module.
The TDJN-G301D tuner provides TV reception and channel tuning.