Acer AL1702 AL1702 Service Guide - Page 20

6. Abnormal plug and play operation AL1702 Confirm the host computersupplies DDC2 mode. NG OK Failure Point The host machine is not communicatiog in DDC2 mode. Check the voltage on P302 pin13 that is power DC 5 V. NG OK Failure Point TheVideo cable is failure. Check the voltage on I304 pin8 that is power DC 5 V. NG OK Failure Point 1) Printed wire broke between I304 pin8, D309, D310 and P302 pin13. 2) D309 or D310 is failure. 3) D315 is failure. Check the voltage on P302 pin11, 12 that is serial data / clock signal. NG OK Failure Point TheVideo cable is failure. Check the output signal of serial data / clock on I304 pin5, 6. NG OK Failure Point 1) Printed wire broke between I309 pin2, 3, I304 pin5, 6 and P302 pin11, 12. 2) I309 maybe failure. 3) R336, R337 is open. 4) C349, C350 is short. Failure Point I304 is failure. Page 18