Philips 32PFL4508 - Video Signal Section Troubleshooting

8-3 PL13.9ATR
[Video Signal Section]
No
Is the "L" pulse supplied to Pin(5) of CN4001?
Ye s
Is approximately +3.3V voltage supplied to Pin(1) of
CN4001?
No
FLOW CHART NO.2
Check AL+3.3V line and repair it if defective.
Ye s
Replace Digital Main CBA Unit.
When touching each buttons, does the Pin(6) voltage
of CN4001 decrease?
The key operation is not functioning.
FLOW CHART NO.1
Ye s
Replace Digital Main CBA Unit.
Replace Function CBA Unit.
Replace Function CBA Unit.
No
No operation is possible from the remote control unit. (Operation is possible from the unit.)
Picture does not appear normally.
FLOW CHART NO.3
Is approximately +
3.3V voltage supplied to Pin(16) of
CN501?
Digital Main CBA Unit or LCD Panel Assembly may
be defective.
Check and replace these parts.
No
Ye s
Is approximately +21V voltage supplied to
Pin(1, 2, 3, 4) of CN501?
See FLOW CHART NO.5 <P-ON+21V is not output.
[Power Supply Section]>
See FLOW CHART NO.7 <AL+3.3V is not output.
[Power Supply Section]>
No
Ye s