LG 55QNED85SQA Service Manual page 26

Standard Repair Process
Error
symptom
No Video/
No audio
A. Video error
No video/ No audio
☞A9
Check various
Normal
voltages of Power
voltage?
Board (12V...)
Replace Power
Board and repair
parts
Established
Revised date
Check and
Y
replace
MAIN B/D
N
date
End
2/17