LG 55UB820T Service Manual page 54

Standard Repair Process
Error
LCD TV
symptom
No Video/
No audio
A. Video error
No video/ No audio
☞A18
Check various
Normal
voltages of Power
voltage?
Board ( 3.5V,12V,20V
or 24V...)
Replace Power
Board and repair
parts
Established
Revised date
Check and
Y
replace
MAIN B/D
N
2
2013.01.31
date
End
2/16