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50PT350B-SG (CHASSIS:PB12K) - LG TV Service Manual (repair manual). Page 49

Read LG 50PT350B-SG (CHASSIS:PB12K) Service Manual online

7. AV Video Trouble Shooting
Y
Check Jack JK1000/JK1002
N
Y
Check CVBS Signal
R1003/R1044
N
Y
Check CVBS Signal
R187/R188/C226/C227
N
Replace one of 
R187/R188/C226/C227
& Recheck
Y
Y
Replace Jack
Maybe Mstar S7LR(IC101)
has problems
Check Signal Format
Is it supported signal?
Check AV Cable
Replace one of
R1003/R1044
& Recheck
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