Sharp LC-20AV7U Service Manual - Page 24
Flow Chart No.21
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FLOW CHART NO.21 No operation is possible from the remote control unit. Operation is possible from the remote control unit. Is 3.3V voltage supplied to Pin(3) terminal of the No infrared remote control receiver (RV1142)? Yes Is the "L" pulse sent out Pin(1) terminal of receiver No (RV1142) when the infrared remote control is activated? Yes Is the "L" pulse supplied to the Pin(3) of CN1302? No Yes Check IC1202 and the periphery circuit, and service it if defective. Check AL+3.3V(D) line and service it if defective. Replace the infrared remote control receiver (RV1142) or the remote control unit. Check the line between Pin(1) terminal of receiver (RV1142) and Pin(3) of CN1302 , and service it if defective. 7-7 A7144_45TS
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7-7
A7144_45TS
Check IC1202 and the periphery circuit, and service
it if defective.
No
Is the "L" pulse sent out Pin(1) terminal of receiver
(RV1142) when the infrared remote control is
activated?
Check the line between Pin(1) terminal of receiver
(RV1142) and Pin(3) of CN1302 , and service
it if defective.
Yes
Is the "L" pulse supplied to the Pin(3) of CN1302?
Yes
Is 3.3V voltage supplied to Pin(3) terminal of the
infrared remote control receiver (RV1142)?
No
No operation is possible from the remote control unit.
FLOW CHART NO.21
Operation is possible from the remote control unit.
Check AL+3.3V(D) line and service it if defective.
No
Replace the infrared remote control receiver
(RV1142) or the remote control unit.
Yes