LG 50LN54 Series Service Manual page 48

Standard Repair Process
Error
LCD 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 > Off
Speaker off
Y
Cancel OFF
Check Speaker
disconnection
☞A16
Check audio B+ 24V
N
of Power Board
Replace Power Board and repair parts
N
Disconnection
Y
Replace Speaker
Established
2013. 01 .09
date
Revised date
Y
Normal
voltage
N
Replace MAIN Board
End
9/14
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