LG OLED77C9PTA Service Manual

No audio
Screen normal
Check Sound menu
→ Internal TV speaker
or not
Internal TV
Speaker
Y
N
Select Internal TV Speaker
Check
audio B+ voltage(20V)
of Power Board
Normal
voltage
Y
N
Replace Power Board or repair parts
Check Speaker
cable connection
N
Y
Connect Speaker cable
Replace Main B/D
End
C. Audio error
No audio / Normal video
☞
A13
☞
A14 & A10/A11
Disconnection
Established
date
Revised date
10/17
Error
symptom
Standard Repair Process
10
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LG OLED77C9PTA Specifications

General

Brand	LG
Model	OLED77C9PTA
Category	OLED TV
Language	English