LG OLED55B7P Service Manual page 23

Standard Repair Process
Error
symptom
No Video/
No audio
A. Video error
No video/ No audio
☞A9
Check various voltages
Normal
of Power Board (Main)
voltage?
(20V, 12V...)
Replace Power
Board and repair
parts
Established
Revised date
Check and
Y
replace
MAIN B/D
N
2
date
End
2/15