Philips 43PFL4902/F7 - Signal and Operation Problems

8-3 PL17.06TR
[Video Signal Section]
No
Is the "L" pulse supplied to Pin(3) of CN4051 when the
infrared remote control activated?
Ye s
Is approximately +3.3V voltage supplied to Pin(1) of
CN4051?
No
FLOW CHART NO.2
Check AL+3.3V line and repair it if defective.
Ye s
Replace the Digital Main CBA Unit.
When pressing 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.
Replace the IR Sensor CBA Unit or replace the
remote control 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
Digital Main CBA Unit or LCD Panel Assembly may
be defective.
Check and replace these parts.
Ye s
Is approximately +20V voltage supplied to
Pin(18, 19, 20, 21, 22, 23, 24, 25, 26, 27) of CN651?
See FLOW CHART NO.5 <P-ON+20V is not output.
[Power Supply Section]>
No