Acer X193 X183H / X193HQ Service Guide - Page 28

5. Troubleshooting (continued) 5.8 Abnormal plug and play operation (For the DVI) ACER X193HQ 27 Go to cover page Confirm the host computersupplies DDC2 mode. NG OK Failure Point The host machine is not communicatiog in DDC2 mode. Check the voltage on P303 pin14 that is power DC 5 V. NG OK Failure Point The Video cable is failure. Check the voltage on P303 pin 16 that is 4.5V. NG OK Failure Point 1) Printed wire broke between P303 pin 14 and pin 16. 2) R340 is open. 3) C323 or C324 is short. Check the voltage on Q307 pin1 that is power DC 3.3 V. NG OK Failure Point 1) Printed wire broke between VR307 pin3,D325 and P303 pin14 2) R361,R372,R363 is short or open. 3) D325,Q307,I304 is failure. Check the voltage on P303 pin 6, 7 that is serial data / clock signal. NG OK Failure Point The Video cable is failure. Check the output signal of serial data / clock on I305 pin 2.3 NG OK Failure Point 1) Printed wire broke between I305 pin2,3,R344,R345 and P303 pin6,7. 2) I305 maybe failure. 3) R422,R423 is open or short. 4) R344,R345 is open or C337,C336 and D321,D320 is short Failure Point I305 is failure.