Philips 40PFL4609/F8 - Video Signal Section Troubleshooting

8-3 PL14.32ATR
[Video Signal Section]
FLOW CHART NO.2
FLOW CHART NO.1
No
Is the "L" pulse supplied to Pin(5) of CN4052 when the
infrared remote control activated?
Ye s
Is approximately +3.3V voltage supplied to Pin(1) of
CN4052?
No
Check AL+3.3V line and repair it if defective.
Ye s
Replace the Digital Main CBA Unit.
Replace the IR Sensor CBA Unit.
No operation is possible from the remote control unit. (Operation is possible from the unit.)
Picture does not appear normally.
FLOW CHART NO.3
[TYPE A]
Is
approximately +
3.3V voltage supplied to Pin(8) 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(20, 21, 22, 23) 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
Picture does not appear normally.
[TYPE B]
Digital Main CBA Unit or LCD Panel Assembly may
be defective. Check and replace these parts.
Is approximately +21V voltage supplied to
Pin(20, 21, 22, 23) of CN501?
See FLOW CHART NO.5 <P-ON+21V is not output.
[Power Supply Section]>
No
Ye s
When pressing each buttons, does the Pin(6) voltage
of CN4052 decrease?
The key operation is not functioning.
Ye s
Replace the Digital Main CBA Unit.
Replace the Function CBA Unit.
No