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55GA7900-UA (CHASSIS:LA37G) - LG TV Service Manual (repair manual). Page 87

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No audio
Screen normal
Check user 
menu  > 
Speaker off
Off
N
Y
Cancel OFF 
Check audio B+ 24V 
of Power Board
Normal
voltage
Y
N
Replace Power Board and repair parts
Check Speaker 
disconnection
N
Y
Replace Speaker 
Replace MAIN Board
End
C. Audio error
No audio/ Normal video  
☞A24
☞A25
Disconnection
Established
date 
Revised date 
LCD  TV
Error
symptom
Standard Repair Process
41
2012.01.16
2013.01.30
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