42LC5DC (CHASSIS:LA65A) - LG TV Service Manual (repair manual). Page 27

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AV Video Trouble Shooting
Check signal format
Is it supported?
Check signal
Rear - RR537 (Composite), 
RR535 / RR536 (S-Video) 
Side ñ R503 (Composite), 
R501 / R502 (S-Video)
Replace it.
Y
N
Check J501 (Rear)
Check P500 & Cable (Side)
Replace connector
Y
N
Y
Maybe FI-8668(IC506) has problems
Check AV Cable / S-Video Cable
Y
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