Av1 No Audio Problem - LG 42SL90QD Service Manual

LCD TV
Symptom
AV1 Video OK ?
YES
Check the RCA Cable
YES
Check MAIN B'D JK402
NO
YES
MAIN B'D
C2011 (Right Sound)
C2012 (Left Sound)
YES
signal ?
NO NO
Check MAIN B'D
C229, C230
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes

AV1 No Audio Problem

Replace MAIN B'D JK402
Replace MAIN B'D IC 100
Making 2009. 2 . 1
Revision Revision
16/25
LGE Internal Use Only