LG 55LM9600 Service Manual page 71

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 audio
Move to No
video/No audio
※Precaution
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
☞A1
Y
Normal Check Back Light
audio On with naked eye
N
☞A2
Check Power Board 24V output
☞A7 & A3
A. Video error
No video/ Normal audio
☞A4
Y Check Power
On
Board
24V, 12V,3.5V etc.
N
Replace Inverter
Normal Y
or module
voltage
N
Repair Power
Board or parts
Replace Main Board
1
Established
2012.01.16
date
Revised date
Y Replace T-con
Normal
Board or module
voltage
And Adjust VCOM
N
Repair Power
Board or parts
End
Re-enter White Balance value
1/15
LGE Internal Use Only