LG 55G2 Service Manual page 86

Standard Repair Process
LCD TV
First of all, Check whether all of cables between board is inserted properly or not.
(Main B/D↔ Power B/D, LVDS Cable,Speaker Cable,IR B/D Cable,,,)
No video
Normal
Normal audio
Move to No
video/No audio
※Precaution ☞A7 & A3
Always check & record S/W Version and White
Balance value before replacing the Main Board
Copyright ⓒ 2012 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Error
symptom
No video/ Normal audio
☞A1
Y
Check Back Light
audio On with naked eye
N
☞A2
Check Power Board 24V output
A. Video error
☞A4
Y Check Power Board
On
24V, 12V,3.5V etc.
N
Replace module
Normal Y
voltage
N
Repair Power
Board or parts
Replace Main Board
34
Established
2012.01.16
date
Revised date
Y Replace T-con Board
Normal
or module
voltage
And Adjust VCOM
N
Repair Power Board
or parts
End
Re-enter White Balance value
2012.03.21
LGE Internal Use Only