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50PM6700-TK (CHASSIS:PA22A) - LG TV Service Manual (repair manual). Page 60

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Y
Check Jack JK501/JK504
N
Y
Check Signal
C537/C538/C539/540/C541/C542
N
Check equipment / Replace Jack
Check Video Output
Replace one of
C537/C538/C539/540/C541/C542 
& Recheck
N
Follow procedure external input 
video trouble shooting
Y
Follow procedure All source 
audio trouble shooting
N
Maybe MTK5369(IC100) audio 
block has problems. Replace It
12. Component / RGB / AV Audio Trouble Shooting
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