"Bob Urz" wrote in message
...
If you brave and its not potted, pry the convertor apart and
see if you can trouble shoot it. If its already dead, you
cannot hurt it anymore than it is.

It is potted, so no way to get inside

I had one of these displays on a Delco radio once that
had me going. Turned out the tiny glass extension where
they suck the air broke off and let the vacuum out.

I will double check the display itself.
And maybe replace the module from the good one to be sure.