[Info-vax] Troubles with using LCD monitor on Vaxstation 3100/38

[Chris]

On 11/04/16 21:39, maltboy20 at gmail.com wrote:
> I am testing a number of Vaxstations before sending them to my users and none of them are generating output to the monitor.
>
> 1) I am using the Digital brand cable of 15 pin male breaking out to 5 BNC connectors and then into VGA end for LCD monitor.
>
> 2) I am using the same Dell 1908FP monitor they use at the plant that is autosyncing and has the range to work with the output from the VAxstation.
>
> 3) I have a keyboard and mouse connected to the Vaxstation, but no network (is that the problem)?
>
> 4) The S3 switch is down, but I've tried it in the up position without any luck.
>
> I have tried other monitors as well with no luck.  I don't have a SOG type monitor, nor any CRT ones.
>
> The monitor is telling me no output is coming.
>
> Any ideas?  I am stuck and the vendor is not helping.
>
> Thanks, Mike

One thing to verify is that the lcd is capable of displaying
the resolution, as many show a blank screen if the video is
outside the V and V sync frequencies. You may get a short
message about "invalid sync range", but no guarantee of that.

If you have access to a scope, check out the signals to see
if they look sensible. Otherwise, disable the video or take the
framebuffer board out and use a serial console to check that the
machine actually works...

Regards,

Chris