Philips 50HFL3683S/F7 Service Manual page 26

[Video Signal Section]
FLOW CHART NO.1
The key operation is not functioning.
Yes
Replace Digital Main CBA Unit.
FLOW CHART NO.2
No operation is possible from the remote control unit. (Operation is possible from the unit.)
Yes
Yes
Yes
Replace Digital Main CBA Unit.
FLOW CHART NO.3
Picture does not appear normally.
Yes
Yes
No
Is approximately +3.3V voltage supplied to Pin(1)
of CN4001?
Yes
Replace IC4001
or Function CBA.
No
Check AL+3.3V line and repair it if defective.
No
Replace the remote control receiver (RS4051)
or the remote control unit.
Check the line between Pin(1) of remote control
No
receiver (RS4051) and Pin(5) of CN4001.
Repair it if defective.
No
See FLOW CHART NO.6 <P-ON+12V is not output.
[Power Supply Section]>
No
See FLOW CHART NO.8 <AL+3.3V is not output.
[Power Supply Section]>
9-3
No
Check AL+3.3V line and
repair it if defective.
A21UZ_TR