LG OLED77Z19LA - Page 31

No audio
Screen normal
Check user menu
→ Internal TV Speaker
or not
Off
N
Y
Cancel OFF
Check audio B+
voltage(20V) of
Power Board
Normal
voltage
Y
N
Replace Power Board and repair parts
Check Speaker
disconnection
N
Y
Replace Speaker
Replace MAIN Board
End
C. Audio error
No audio/ Normal video
☞A11 ☞A12+A9
Disconnection
Established
date
Revised date
10/18
Error
symptom
Standard Repair Process
10
Copyright © 2021 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.