Abnormal Plug And Play Operation; Abnormal Ddc2 - LiteOn B17AAU Service Manual

6. Abnormal plug and play operation

6.1 Abnormal DDC2

Confirm the output of serial data on I312 pin 6 synchronize SCLK at TTL level.
O K
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 I312 pin 6 and P304 pin 15 may have failed.
4) R335 open.
5) Cable failure.
Trouble Shooting
Failure point
N G
I312 failure.
Failure point
B17AAU / B17ANU / B17AAY
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