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42LH301C (CHASSIS:LD91A) - LG TV Service Manual (repair manual). Page 68

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Check the CVBS 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 JK400
Replace MAIN B’D JK400
NO
YES
Making 
Revision 
2009. 2 . 1
24/34
 LCD TV
Symptom
Component No Audio Problem
26~42LH2000
32~47LH3000/LH4000
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