LG 43LF5900 Service Manual page 48

Standard Repair Process
Error
symptom
No audio
Screen normal
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Only for training and service purposes
C. Audio error
No audio/ Normal video
☞A24
Check user
menu > Off
Speaker off
Y
Cancel OFF
Check Speaker
disconnection
☞A25
N
Check A13V of Power
Board
Replace Power Board and repair parts
N
Disconnection
Y
Connect Speaker to Main cable
Established
date
Revised date
Y
Normal
voltage
N
Replace MAIN Board End
8/13
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