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5.7 Abnormal plug and play operation for VGA
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.
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
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
The host machine is not communicatiog in DDC2B
mode.
Failure Point
The Video cable is failure.
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.
27
ACER P223W
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