Philips LF501EM4 - The Key Operation Is Not Functioning; No Operation Is Possible from the Remote Control Unit; Picture Does Not Appear Normally

8-3 FL13.16ATR
[Video Signal Section]
No
Is the "L" pulse supplied to Pin(5) of CN4052?
Ye s
Is approximately +3.3V voltage supplied to Pin(3)
terminal of the remote control receiver (RS4051)?
No
FLOW CHART NO.2
Check AL+3.3V line and repair it if defective.
Ye s
Replace the Digital Main CBA Unit.
When touching each buttons, does the Pin(2) voltage
of CN4001 decrease?
The key operation is not functioning.
FLOW CHART NO.1
Ye s
Replace the Digital Main CBA Unit.
Replace the Function CBA Unit.
Replace the IR Sensor 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(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