5.7Abnormal plug and play operation for VGA
Confirmthe host computer supplies DDC2B mode.
OK
NG FailurePoint
Thehost machine is not communicatiog in DDC2B mode.
Checkthe voltage onQ307 pin1 that is power DC
3.3V.
OK
NG FailurePoint
1)Printed wire broke between Q307 pin3,D325 and
P302pin9
2)R369,R372,R363 is short or open.
3)D325 is failure or Q307,I304 is failure.
Checkthe output signal of serial data / clock on I305
pin5,8.
OK
NG FailurePoint
I305is failure.
Checkthe voltage onP302 pin9 that is power DC 5 V.
OK
NG FailurePoint
TheVideocable is failure.
Checkthe signal onP302 pin12,15 thatis serial data
/clock signal.
OK
NG FailurePoint
TheVideo cable is failure.
FailurePoint
1)Printed wire broke among I305 pin5,8,R320,R321and
P302pin12,15
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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ACERX193HQ