Troubleshooting - Philips 40PFL5505D/F7 Service Manual

FLOW CHART NO.1
The power cannot be turned on.
FLOW CHART NO.2
The key operation is not functioning.
Is 3.3V voltage supplied to Pin(3) of CN3004 on the
Digital Main CBA Unit?
Is 3.3V voltage supplied to Pin(1) of CN4001 on the
Function CBA Unit?
Is the Pin(3) voltage of CN4001 0V when pressing
power switch?
FLOW CHART NO.3
No operation is possible from remote control unit. (Operation is possible from the unit.)
Is the "L" pulse sent out Pin(2) of CN4052 on the
IR Sensor CBA Unit?

TROUBLESHOOTING

Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Replace Power Supply CBA Unit.
No
See FLOW CHART NO.2 <The key operation is not
functioning.>
No
See FLOW CHART NO.3 <No operation is possible
from remote control unit. (Operation is possible from
the unit.)>
No
Replace Digital Main CBA Unit.
No
Replace Digital Main CBA Unit.
No
Check the line between Pin(1) of CN4001 and Pin(3)
of CN3004, and service it if defective.
No
Replace Function CBA Unit.
No
Check AL+3.3V line and service it if defective.
No
Replace IR Sensor CBA Unit.
No
Check CL3004 and service it if defective.
8-1 PL10.4TR