LG 50UH5500 Service Manual page 91

Standard Repair Process
Error
symptom
☞A20
Check user m
No audio
enu >
Screen normal
Speaker off
C. Audio error
No audio/ Normal video
☞A21+A18
Check audio B+ A
N
Off 13V of Power Boar
d
Y
Cancel OFF Replace Power Board and repair parts
Check Speake
Disconnection
r disconnectio
n
Y
Replace Speaker
8
Established
date
Revised date
Y
Normal
voltage
N
N
Replace MAIN Board
8/16
End