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42LM580S, 42LM580T, 42LM585S (CHASSIS:LD21B) - LG TV Service Manual (repair manual). Page 51

Read LG 42LM580S / 42LM580T / 42LM585S (CHASSIS:LD21B) Service Manual online

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  
☞A15
☞A16
Disconnection
Established
date 
Revised date 
9/14
LCD  TV
Error
symptom
Standard Repair Process
2012. 01 .14
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