Technical description and composition of the LG 43UH671V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 43UH671V -ZF
Chassis / Version: UD63J
Panel: LC430DGG (FJ) (M2)
LED backlight: 6916L-2563A
LED driver (backlight): integrated into PSU
Power Supply (PSU): EAX66793301 (1.6) LGP43DIMU-16CH2 EAY64269501
MainBoard: EAX66804605 (1.1)
Tuner: TDJN-G301D
Control: Wi-Fi: EAT63153401 LGSBWAC61
Specifications 43UH671V
LG 43UH671V
General repair guidelines for TV LCD LED
Possible malfunctions
- LG 43UH671V does not turn on, the indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.
With such manifestations, a malfunction is most likely to be detected in the EAX66793301 power module. It is necessary to measure its output voltages and, if they are absent, to check the short circuit probability in the converters power switches and rectifier diodes.
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually work abnormally in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse often 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. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM), in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
The faulty usually in these cases is the backlight matrix (LED-panel). More often the reason for this is the breakdown of the LEDs, or poor contact in the connectors of the strips, less often the LED driver may be malfunctioning.
It is impossible to detect a break in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and to open their transitions, a voltage of several tens of volts is required. Ideally, a current source is suitable for such purposes. You can open the panel and check each LED separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect the probes in the forward direction to it (red probe to the anode, black to the cathode). In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as a health indicator. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- 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 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).
In the absence of tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltages on the terminals of the TDJN-G301D tuner. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using an oscilloscope.
Once again, remind users! Attempts to self-repair the LG 43UH671V TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
schematic diagram -----------> manual LG 43UH671V Chassis UD63J
The appearance of the MainBoard EAX66804605 is shown in the figure below:EAX66804605
Main features of the device LG 43UH671V:
Installed matrix (LED-panel) LC430DGG (FJ) (M2).
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 43UH671V TV is carried out by the EAX66793301 power module, or its analogues.
MainBoard - the main board (motherboard) is an EAX66804605 module.
The TDJN-G301D tuner provides TV reception and channel tuning