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42LH90QD (CHASSIS:LT91C) - LG TV Service Manual (repair manual). Page 64

Read LG 42LH90QD (CHASSIS:LT91C) Service Manual online

Check the RCA Cable
YES
Check MAIN B’D
C2008, C2009
MAIN B’D
C2008 (Right Sound)
C2009 (Left Sound)
signal ?
YES
NO
Replace MAIN B’D IC 100
AV2 Video OK ?
YES
Check MAIN B’D JK402
Replace MAIN B’D JK402
NO
YES
Making 
Revision 
2009. 2 . 1
17/25
LCD TV
Symptom
AV2 No Audio Problem
30
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