LG 28LM4 0B-PU Series Service Manual page 25

Standard Repair Process
Error
symptom
No Video/
No audio
A. Video error
No video/ No audio
A18
Check various
Normal
voltages of Power
voltage?
Board (12.5V...) ( )
N
Replace Power
Board and repair
parts t
- 25 -
Established
date
Revised date
Check and
Y
replace
MAIN B/D MAIN B/D
End
2/13
2019