6-10
6. Abnormal plug and play operation
OK
NG
Failure point
I308 failure
Confirm the input of serial clock on I308 pin 6 SCL at TTL level.
Failure point
1) The video cable may have failed or may not have connections for DDC.
2) Between I308 pin 6 and P302 pin 14 may have failed.
3) R337 open.
4) Cable failure.
OK
NG
Confirm the input of serial data on I308 pin 5 SDA at TTL level.
Failure point
1) The host machine isn't communicating in DDC2 mode.
2) The video cable may have failed or may not to have connections for DDC.
3) Between I308 pin 6 and P302 pin 13 may have failed.
4) R338 open.
5) Cable failure.
Failure point
I308 failure
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