Acer NA23WABAS Service Manual page 47

46
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 P303 pin9 that is power DC 5 V.
OK
Check the signal on P303 pin12, 15 that is serial data
/ clock signal.
OK
Check the output signal of serial data / clock on I312
pin41, 42.
OK
Failure Point
1) Printed wire broke among I312 pin41,42,R359,R358
and P303 pin12,15
2) I312 maybe failure.
3) R355,R356 is open.
4) D323 or D324 or C333 or C334 is shorted.
NG
Failure Point
The host machine is not communicatiog in DDC2B mode.
NG
Failure Point
TheVideo cable is failure.
NG
Failure Point
The Video cable is failure.
Failure Point
NG
I312 is failure.