LG 75SM9400PTA Service Manual page 37

Standard Repair Process
Error
symptom
No Video/
No audio
A. Video error
No video/ No audio
☞A9
Check various
Normal
voltages of Power
voltage?
Board (13.2V...)
Replace Power
Board and repair
parts
Established
Revised date
Check and
Y
replace
MAIN B/D
N
2
date
End
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