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42PW350E-DC (CHASSIS:PB11A) - 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 JK1000
N
Y
Check Component Signal
R1074/R1073/R1076
R1001/R1004/R1067
N
Replace one of
R1074/R1073/R1076
R1001/R1004/R1067
& Recheck
Y
Check Component Signal
R173/R175/R177
R180/R182/R184
N
Replace it
Y
Y
Check Component Cable
Replace Jack
Maybe Mstar S7R(IC101)
has problems
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