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42LH50YD (CHASSIS:LJ91C) - LG TV Service Manual (repair manual). Page 44

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5. Component Video Trouble Shooting
Check Signal Format
Is it supported signal?
Y
Check Component Jack JK700
N
Y
Check Component Signal
R754, R755, R756
R741, R744, R745
N
Replace one of
R754, R755, R756 
/L705/L706/L707
R741, R744, R745 
/L702/L703/L704
& Recheck
Y
Check Component Signal
C127, C128, C129
C130, C131. C132
N
Replace it
Y
Y
Check Component Cable
Replace Jack
Maybe BCM3556(IC100)
has problems
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