37LV3500-ZA, 37LV3550-ZB, 37LV355A-ZB, 37LV355C-ZB, 37LV355N-ZB, 37LV355T, 37LV355U-ZB (CHASSIS:LD01U) - LG TV Service Manual (repair manual). Page 69

Read LG 37LV3500-ZA / 37LV3550-ZB / 37LV355A-ZB / 37LV355C-ZB / 37LV355N-ZB / 37LV355T / 37LV355U-ZB (CHASSIS:LD01U) Service Manual online

No audio
Screen normal
Check user 
menu  > 
Speaker off
Off
N
Y
Cancel OFF 
Check audio B+ 
20V or 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 
8/13
LCD  TV
Error
symptom
Standard Repair Process
8
2010. 2 .19
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