LG 50PG6300 Service Manual page 23

7. No Display – AV1/2(SCART) Input
- Check the condition of the SCART cable connection.
- Check the system clock (27MHZ,Y171) and the Voltage of VCTP_P(U81)
Check input source cable or jack(JP436,466)
Check input source cable or jack(JP436,466)
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Only for training and service purposes
Repeat A, B Process
Pass
Check the signal(R,G,B/CVBS)
input/output of U397
Pass
Check the signal input/output of U81
Pass
SCART CVBS Output
Check the signal (SCART CVBS output)
of U81
Pass
Check the signal input/output of U396
Pass
-Level0(TV mode) : 0V to +2V
-Level1A(16:9 mode) : +4.5V to +7V
-Level1B(4:3mode) : +9.5V to +12V
- CVBS mode : 0V to 0.4V
- RGB mode : 1V to 3V
Fail
Fail
Fail
Fail
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Re-soldering or Change the
defect part(U397)
Re-soldering or Change the
defect part(U81)
Re-soldering or Change the
defect part(U81)
Re-soldering or Change the
defect part(U396)
LGE Internal Use Only