No
Is the "L" pulse sent out Pin(5) of CN4052 when the
infrared remote control is activated?
Ye s
Is approximately +3.3V voltage supplied to Pin(1) of
CN4052?
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(6) voltage
of CN4052 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
Digital Main CBA Unit or LCD Panel Assembly may
be defective.
Check and replace these parts.
Ye s
Is the P-ON+21V line voltage normal?
See FLO
W CHART NO
.5 <P-ON+21V is not output.
[Power Supply Section]>
No
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