Abnormal Plug And Play Operation - NEC MultiSync LCD1700NX A Service Manual

6. Abnormal plug and play operation

Abnormal DDC2
Confirm the input of serial clock on I312 pin 6, I310 pin 6 synchronize SCL at TTL level.
NG Failure point
I310, I312 failure
OK
Failure point
1) The host machine isn't communicating in DDC2 mode.
2) The video cable may have failed or may not have connections for DDC.
3) Between I312 pin 6 and P304 pin 15 may have failed.
4) Between I310 pin 6 and P303 pin 6 may have failed.
5) R335, R326 open.
6) Cable failure.
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