LG 42LA86 Series Service Manual page 92

Standard Repair Process
Error
LCD TV
symptom
No Video/
No audio
A. Video error
No video/ No audio
☞A4
Check various voltages
of Power Board Normal
voltage?
( 3.5V,12V,20V or 24V...)
Replace Power
Board and repair
parts
Established
Revised date
Check and
Y
replace
MAIN B/D
N
2012. 12 .06
date
End