NEC MultiSync LCD1550V - Abnormal DDC2; Abnormal Plug and Play Operation

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7. Abnormal plug and play operation
7.1 Abnormal DDC2
Confirm the output of serial data on U9 pin 6 synchronize
SCLK at TTL level.
NG
Failure point
U9 failure.
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 U19 pin 6 and CN1 pin 15 may have failed.
4) Cable failure.
OK
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