Abnormal Plug And Play Operation - NEC MultiSync LCD1550ME Service Manual

Table of Contents

6. Abnormal plug and play operation

Confirm the input of serial clock on I308 pin 6 SCL at TTL level.

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.

Confirm the input of serial data on I308 pin 5 SDA at TTL level.

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

Failure point

I308 failure

Failure point

6-10

Table of Contents

Table of Contents

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