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LC-20SD4E (serv.man2). Part 2 - Sharp TV Service Manual (repair manual). Page 10

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TROUBLESHOOTING GUIDE
E-1
POWER DOES NOT TURN ON
NO
IS F501 BROKEN ?
YES
CHANGE F501.
NO
YES
CHECK IC501 AND
PERIPHERAL CIRCUIT.
NO
YES
CHECK IC504 AND
PERIPHERAL CIRCUIT.
OR CHANGE IC504.
CHANGE AV PCB.
IS THERE VOLTAGE
AT PIN 2 OF IC504
AT5V ?
IS THERE VOLTAGE
AT PIN 4 OF IC501
18.9V ?
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