Technical description and composition of the LG 49UK6200 TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 49UK6200
Chassis / Version: LJ8 Chassis EAX67872805 (1.1)
Panel: NC490DGG AAGP1
LED backlight: Direct LED
LED driver (backlight): integrated into PSU
MOSFET LED driver: TO-252
Power Supply (PSU): LGP49DJ-17U1 EAX67189201 (1.6) EAY64511101
PWM Power: PFC, PWM
MOSFET Power: TO-252
MainBoard: EAX67872805 (1.1)
Tuner: TDJA-G601D
Technical Specifications 49UK6200
LG 49UK6200
General repair guidelines for TV LCD LED
Possible malfunctions
- LG 49UK6200 does not turn on, does not respond to buttons and remote control, indicators on the front panel do not light up and do not blink.
With such manifestations, a malfunction is most likely to be detected in the LGP49DJ-17U1 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 of diodes in the secondary circuits, the converter can operate in emergency short circuit mode without output voltages, and during short circuit in the power elements of the primary circuit, the mains fuse and / or current sensor at the source of the key usually breaks.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. PWM, PWM, PWM microchips are usually checked by replacing with new ones, or obviously working.
- There is no image, there is sound, it is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
The most likely in these cases is a malfunction of the LED backlight. The reason can be found in the malfunction of the LEDs, in the violation of the contact connections of the LED strips, or in the provision of their power (LED-driver).
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 on the front panel blinks, the TV does not turn on in operating mode, it does not respond to the remote control.
Repair or diagnostics of the EAX67872805 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 a TDJA-G601D tuner is suspected of a malfunction, first of all, it is necessary to verify the correctness of the software, as well as the presence of the required voltage levels and data exchange pulses with the processor via the I2C bus at the corresponding tuner pins.
It should be remembered! Attempts to self-repair the LG 49UK6200 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 EAX67872805 is shown in the figure below:EAX67872805
The appearance of the power supply
Main features of the device LG 49UK6200:
Installed matrix (LED-panel) NC490DGG AAGP1.
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 for all nodes of the TV LG 49UK6200 are generated by the power module LGP49DJ-17U1, or its analogs using PFC, PWM microcircuits and TO-252 power switches.
MainBoard - the main board (motherboard) is an EAX67872805 module.
The TDJA-G601D tuner provides TV reception and channel tuning.
