LG 86UH9500 Service Manual page 109

Standard Repair Process
Error
symptom
No audio
Screen normal
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Only for training and service purposes
C. Audio error
No audio/ Normal video
☞A20
Check menu >
Sound Out set Correct
CORRECT output
N
Set correct output
Check Speaker
disconnection
☞A21+A18
Check audio B+ 20V
Y
of Power Board
Replace Power Board and repair parts
N
Disconnection
Y
Replace Speaker
8
Established
date
Revised date
Y
Normal
voltage
N
Replace MAIN Board
End
8/15
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