The Key Operation Is Not Functioning; No Operation Is Possible From The Remote Control Unit - Sharp LC-15AV7U Service Manual

FLOW CHART NO.19

The key operation is not functioning.

Yes
Yes
FLOW CHART NO.20

No operation is possible from the remote control unit.

Yes
Yes
Yes
Yes
No
Re-install the switches (SW1101,SW1102,SW1103,
SW1104,SW1105,SW1107,SW1111) correctly or
replace the poor switch.
Check the switches (SW1101,SW1102,SW1103,
No
SW1104,SW1105,SW1107,SW1111) and their
periphery, and service it if defective.
No
Check AL+3.3V(D) line and service it if defective.
No
Replace the infrared remote control receiver
(RCV1142) or the remote control unit.
No
Check the line between Pin(1) terminal of receiver
(RCV1142) and Pin(3) of CN1302 , and service
it if defective.
7-6
A7121TS