Technical description and composition of the LG 49LH510V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 49LH510V
Chassis / Version: LD67C
Panel: NC490DUE
LED backlight: 49LH51_FHD_A S = SSC_49inch_FHD_A_REV00_150924, 49LH51_FHD_B S = SSC_49inch_FHD_B_REV00_150924
T-CON: 49 GOA Tcon Board 47-6021078, HV490FHB-N8D
LED driver (backlight): integrated into MainBoard
Power Supply (PSU): Adapter 19V
MainBoard: EAX66805903 (1.1) RD64M41FRY
IC MainBoard: LGE6351
Tuner: TDJA-G301D
Control: Remote: AKB74475490, IR: YW-F01LD V1.4 20150311 EBR80772102
Specifications 49LH510V
LG 49LH510V
General repair guidelines for TV LCD LED
Possible malfunctions
- The LG 49LH510V TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light or flash.
Most likely in this case, the main switching power supply (IPS) Adapter is faulty.
The external adapter 19V 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 measure its secondary output voltages, and if they are absent, check the power switches and rectifier diodes in the converters for a short circuit.
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.
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 microcircuits are usually checked by replacement with new ones, or obviously working.
- 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 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.
To detect a break in the LED lines without disassembling the panel, a current source is required. It is impossible to open transitions connected in series with a simple multimeter; voltage of several tens of volts is necessary.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the EAX66805903 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 and replace failed chips with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board technologies. Typically, such defects are detected by local heating of the chip.
If there is no reception of television channels, but the TV is working properly from external devices, first of all it is necessary to check the voltage of the tuner TDJA-G301D and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
It should be remembered! Attempts to independently repair the TV LG 49LH510V, 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 EAX66805903 is shown in the figure below:EAX66805903
EAX66805903 can be used in TVs:
LG 32LH520U (Panel HC320DXN-ABVS2-5112), LG 49LH510V (Panel NC490DUE).
Main features of the device LG 49LH510V:
Installed matrix (LED-panel) NC490DUE.
The matrix control uses the Timing Controller (T-CON) 49.
To power the backlight LEDs, a converter is used, combined with the main board EAX66805903.
To power all the internal components of the LG 49LH510V TV, an external adapter 19V type source is used.
MainBoard - the main board (motherboard) is an EAX66805903 module, using LGE6351 chips and others.
The TDJA-G301D tuner provides TV reception and channel tuning.
