Acer NA23WABAS Service Manual page 36

5.8 Abnormal plug and play operation for DVI (This page for 1A1D used)
Confirm the host computer supplies DDC2B mode.
Check the voltage on P303 pin14 that is power DC 5 V.
Check the voltage on P303 pin 16 that is 4.5V.
Check the voltage on P303 pin 7, 6 that is serial data /
Check the output signal of serial data / clock on I307
Failure Point
1) Printed wire broke between I307 pin46, 47,
R344, R345 and P304 pin7,6
2) I307 maybe failure.
3) R344,R345 is open.
4) D321 or D320 or C337 or C336 is shorted.
5. Troubleshooting (continued)
NG
OK
NG
OK
NG
OK
clock signal.
NG
OK
pin 46,47
NG
OK
Failure Point
The host machine is not communicating in DDC2B
mode.
Failure Point
The Video cable is failure.
Failure Point
1) Printed wire broke between P303 pin 14 and pin 16.
2) R340 is open.
3) C339 or Q308 is short.
Failure Point
The Video cable is failure.
Failure Point
I307 is failure.
35
ACER V233H
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