LG 32LB520B Service Manual page 38

Standard Repair Process
Error
LED TV
symptom
No audio
Screen normal
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Only for training and service purposes
C. Audio error
No audio/ Normal video
☞ A15
Check user menu
-TV speaker-ON/OFF
Cancel OFF
Check
Speaker
disconnection
☞ A16
Check amplifier
N
Off
power +12V
Y
Check mute control
Y
circuit normal it
should be high
N
Disconn
ection
Y
Replace Speaker
Established
2014.07.07
date
Revised date
Normal Y
Voltage
N
Replace main board or amplifier
N
Replace MAIN Board
9/14
End