LG 86UH9500 Service Manual page 102

Standard Repair Process
symptom
First of all, Check whether all of cables between board is inserted properly or not.
(Main B/D↔ Power B/D, Vx1/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
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Only for training and service purposes
A. Video error
Error
No video/ Normal audio
☞A18
Check Power
Y
Board
12V,20V, etc.
N
Y Replace T-con/Main
Normal
Board or module
voltage
N
Repair or Replace
Power Board or parts
Replace Main Board
1
Established
date
Revised date
Re-enter White Balance value
1/15
LGE Internal Use Only