LG 55LM860V Service Manual page 77

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, LVDS Cable,Speaker Cable,IR B/D Cable,,,)
No video
Normal
Normal audio
audio
N
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 rights reserved.
Only for training and service purposes
A. Video error
Error
No video/ Normal audio
☞A1
Y
Check Back Light
On with naked eye
☞A2
Check Power Board 24V output
☞A4
Y
Check Power
On
Board
24V, 12V,3.5V etc.
N
Replace Inverter
Y
Normal
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