LG 42PT250B Service Manual page 49

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