Philips 43PFL4901/F7 - Page 32

8-3 PL15.13TR
[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.)
FLOW CHART NO.3
Picture does not appear normally.
Digital Main CBA Unit or LCD Panel Assembly may
be defective. Check and replace these parts.
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]>
No
When pressing each buttons, does the Pin(2) voltage
of CN4051 decrease?
The key operation is not functioning.
Ye s
Replace the Digital Main CBA Unit.
Replace the Function CBA Unit.
No
When pressing each buttons, does the Pin(6) voltage
of CN4052 decrease?
Ye s
Replace the IR Sensor CBA Unit.
No