LG 40LF6300-UA Service Manual page 77

Standard Repair Process
Error 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
Always check & record S/W Version and White
Balance value before replacing the Main Board
Copyright ⓒ 2015 LG Electronics. Inc. All right reserved.
Only for training and service purposes
A. Video error
No video/ Normal audio
☞A1
Y
Check Back Light
On with naked eye
Check Power Board 13v output
Repair Power
Board or parts
☞A4
Y Check Power Board
On
13V etc.
N
Replace Inverter
Normal Y
or module
voltage
N
Replace Main Board
Established
date
Revised date
Y Replace T-con Board
Normal
or module
voltage
And Adjust VCOM
☞A28
N
Repair Power Board
or parts
End
Re-enter White Balance value
1/13
LGE Internal Use Only