Read LG 42SL90QD-DA (CHASSIS:LT91L) Service Manual online
Check the RCA Cable
YES
Check MAIN B’D
C229, C230
MAIN B’D
C2011 (Right Sound)
C2012 (Left Sound)
signal ?
YES
NO
Replace MAIN B’D IC 100
AV1 Video OK ?
YES
Check MAIN B’D JK402
Replace MAIN B’D JK402
NO
YES
Making
전자 - 6-2
Revision
2009. 2 . 1
16/25
LCD TV
Symptom
AV1 No Audio Problem
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