LG 55UJ634 Series Service Manual page 38

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 ( 13V)
Replace Power
Board and repair
parts
Established
Revised date
Check and
Y
replace
MAIN B/D
N
2
date
End