Confirmthe host computer supplies DDC2B mode.
OK
NG FailurePoint
Thehost machine is not communicatiog in DDC2B mode.
OK
Checkthe output signal of serial data / clock on I308
pin59, 58.
OK
NG FailurePoint
I308is failure.
Checkthe voltage onP302 pin 9 that is power DC 5 V.
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 I308
pin58,59,R429,R434,R320,R321and P302 pin12,15
2)I308 maybe failure.
3)R314 ,R315 is open.
4)D306 or D308 or C320 or C321 is shorted.
5.7Abnormal plug and play operation for VGA
Go to cover page
30 5.Troubleshooting (continued)
ACERH233H