5.7 Abnormal plug and play operation for VGA
Confirm the host computer supplies DDC2B mode.
OK
NG
Failure Point
The host machine is not communicatiog in DDC2B mode.
Check the voltage on Q307 pin1 that is power DC
3.3V.
OK
NG
Failure Point
1) Printed wire broke between Q307 pin3,D325 and
P302 pin9
2) R369,R372,R363 is short or open.
3) D325 is failure or Q307,I304 is failure.
Check the output signal of serial data / clock on I305
pin5, 8.
OK
NG
Failure Point
I305 is failure.
Check the voltage on P302 pin9 that is power DC 5 V.
OK
NG
Failure Point
TheVideo cable is failure.
Check the signal on P302 pin12, 15 that is serial data
/ clock signal.
OK
NG
Failure Point
The Video cable is failure.
Failure Point
1) Printed wire broke among I305 pin5,8,R320,R321and
P302 pin12,15
2) I305 maybe failure.
3) R424,R425 is open.
4) R328 or R330 or C330 or C331 is open or short.
5) R320 or R321 or D308,D306 is open or short
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26
ACER X193HQ
