Standard Repair Process
Error
symptom
No Video/
No audio
A. Video error
No video/ No audio
☞A9
Check various voltages of
Power Board Board (Main)
(12V,20V)
Replace Power
Board and repair
parts
Check and
Y
Normal
replace
voltage?
MAIN B/D
N
2
Established
date
Revised date
End
Copyright © 2021 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
2/18