LG OLED77B3 Series - C. Audio error (No audio;Normal video)

No audio
Screen normal
Check user
menu >
Speaker off
Off
N
Y
Cancel OFF
Check audio B+
20V of Power
Board
Normal
voltage
Y
N
Replace Power Board and repair parts
Check Speaker
disconnection
N
Y
connecting Speaker
Replace MAIN Board
End
No audio/ Normal video
☞A11 ☞A12+A9
Disconnection
9/16
Standard Repair Process
9
Established
date
Revised date
Error
symptom
C. Audio error
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