Acer X223 X223W LCD Service Guide - Page 27

26 ACER X223W Go to cover page 5.6 Abnormal plug and play operation for VGA 5. Troubleshooting (continued) Confirm the host computer supplies DDC2B mode. NG OK Check the voltage on P302 pin9 that is power DC 5 V. NG OK Failure Point The host machine is not communicatiog in DDC2B mode. Failure Point The Video cable is failure. Check the voltage on I303 pin8 that is power DC 5 V. NG OK Check the signal on P302 pin12, 15 that is serial data / clock signal. NG OK Check the output signal of serial data/clock on I303 pin5, 6. NG OK Failure Point 1) Printed wire broke among I305 pin30, pin31, R328,R330 and P302 pin12, 15 . 2) I303 maybe failure. 3) R326, R327 are open. 4) R328 or R330 or C330 or C331 is open or short. Failure Point 1) Printed wire broke between I303 pin8, D308 and P302 pin9. 2) D309, C329 is short. 3) D308 is failure. Failure Point The Video cable is failure. Failure Point I303 is failure.