Abnormal Plug And Play Operation; Abnormal Ddc2 - NEC LCD1501-BK Service Manual

5. Abnormal plug and play operation

Abnormal DDC2B
Confirm the output of serial data on IC101 pin26
synchronize SCLK at TTL level.
NG
Failure point
IC101 failure.
OK
Failure point
1) The host machine isn't communicating in DDC2B mode.
2) The video cable may have failed or may not to have
connections for DDC.
3) Between IC101 pin26 and J201 pin 15 may have failed.
4) Cable failure.
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