LG 55EA9800 Repair Manual page 13

Standard Repair Process
LCD TV
symptom
First of all, Check whether all of cables between board is inserted properly or not.
(Main B/D↔ Power B/D, EPI Cable,Speaker Cable,IR B/D Cable,,,)
No video
Normal
Normal audio
audio
Move to No
video/No audio
※Precaution ☞A4 & A2
Always check & record S/W Version and White
Balance value before replacing the Main Board
Copyright © 2013 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
A. Video error
Error
No video/ Normal audio
☞A1
Y
Check OLED Light
On with naked eye
N
Check Power Board
☞A18
☞A18
Y Check Power
On
Board
24V, 12V,3.5V etc.
N
24V output
Replace Inverter
Y
Normal
or module
voltage
N
Repair Power
Board or parts
Replace Main Board
1
Established
2013.01.31
date
Revised date
Replace T-con
Y
Normal
Board or module
voltage
And Adjust VCOM
N
Repair Power
Board or parts
End
Re-enter White Balance value
1/16
LGE Internal Use Only