Acer NA23WABAS Service Manual page 48

5.8 Abnormal plug and play operation (For DVI and the same for HDMI)
Confirm the host computersupplies DDC2B mode.
Check the voltage on P304 pin14 that is power DC 5 V.
Check the voltage on P304 pin 16 that is 4.5V.
Check the voltage on P304 pin 7, 6 that is serial data /
Check the output signal of serial data / clock on I312
Failure Point
1) Printed wire broke between I312 pin125, 124,
R383, R382 and P304 pin7,6
2) I312 maybe failure.
3) R379,R380 is open.
4) D327 or D328 or C338 or C339 is shorted.
5. Troubleshooting (continued)
NG
OK
NG
OK
NG
OK
clock signal.
NG
OK
pin 125,124
NG
OK
Failure Point
The host machine is not communicatiog in DDC2B
mode.
Failure Point
The Video cable is failure.
Failure Point
1) Printed wire broke between P304 pin 14 and pin 16.
2) R385,R436 is open.
3) D329 or Q309 is short.
Failure Point
The Video cable is failure.
Failure Point
I312 is failure.
47
ACER V233H
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