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42LH90QD (CHASSIS:LT91C) - LG TV Service Manual (repair manual). Page 66

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Check the Component Cable
YES
Check MAIN B’D
C2013, C2014
MAIN B’D
C2013 (Right Sound)
C2014 (Left Sound)
signal ?
YES
NO
Replace MAIN B’D IC 100
Component Video OK ?
YES
Check MAIN B’D JK402
Replace MAIN B’D JK402
NO
YES
Making 
Revision 
2009. 2 . 1
19/25
LCD TV
Symptom
Component2 No Audio Problem
32
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