LG 50UH5500 Service Manual page 84

Standard Repair Process
Error
LCD TV
symptom
First of all, Check whether all of cables between board is inserted properly or not.
(Main B/D↔ Power B/D, VX1 Cable, Speaker Cable, IR B/D Cable,,,)
Y
No video
Normal
Normal audio
audio
N
Move to No video/
No audio
※Precaution ☞A4 & A2
Always check & record S/W Version and White B
alance value before replacing the Main Board
A. Video error
No video/ Normal audio
☞A1
Check Back Light
On
On with naked eye
N
Panel Vcc (12V) output
☞A18
Normal
voltage
N
Repair Power Bo
ard or parts
Replace Main Board
Established
date
Revised date
☞A18
Y
Check Power Boar
Normal
d +13V
voltage
Repair Power Boa
rd or parts
Replace Inverter
Y
or module
Re-enter White Balance value
1
Y Replace T-con/Main
Board or module
And Adjust VCOM
N
End
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