Acer NA23WABAS Service Manual page 35

34
ACER V233H
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5.7 Abnormal plug and play operation for VGA
5. Troubleshooting (continued)
Confirm the host computer supplies DDC2B mode.
OK
Check the voltage on P302 pin9 that is power DC 5 V.
OK
Check the signal on P302 pin12, 15 that is serial data
/ clock signal.
OK
Check the output signal of serial data / clock on I307
pin34, 35.
OK
Failure Point
1) Printed wire broke among I307 pin34,35,R328,R330
and P302 pin12,15
2) I307 maybe failure.
3) R328,R330 is open.
4) D310 or D311 or C330 or C331 is shorted.
NG
Failure Point
The host machine is not communicatiog in DDC2B mode.
NG
Failure Point
The video cable is failure.
NG
Failure Point
The video cable is failure.
Failure Point
NG
I307 is failure.