LG 50PG6300 Service Manual page 22

6. No Display – AV3(CVBS/S-VIDEO) Input
- Check the condition of the RCA/S-VIDEO cable connection.
- Check the system clock (27MHZ,Y171) and the Voltage of VCTP_P(U81)
Check input source cable or jack(JP496,497)
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Only for training and service purposes
Repeat A, B Process
Pass
Check the signal input/output of U81
Pass
Fail
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Re-soldering or Change the
defect part(U81)
LGE Internal Use Only