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50PJ350-SA (CHASSIS:PB02A) - LG TV Service Manual (repair manual). Page 52

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Customer Oriented R&D
Breakthrough
5. Component Video Trouble Shooting
Check Signal Format
Is it supported signal?
Y
Check Component Jack JK1001
N
Y
Check Component Signal
R1020/R1021/R1022
R1005/R1012/R1013
N
Replace one of
R1020/R1021/R1022
R1005/R1012/R1013
& Recheck
Y
Check Component Signal
R175/R173/R177
R180/R182/R184
N
Replace it
Y
Y
Check Component Cable
Replace Jack
Maybe Mstar S7(IC100)
has problems
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