I had to pause this work until the middle of March.
It may be the case that the snubber diode in your flyback is bad too.
Depending on the failure mode, it may have taken down the drivers on the
video board too.
There are not that many parts on the video driver board and everything is
superbly accessible on all of the DEC VT-1xx terminals. This is a finite process.
I am not giving up on this project. No matter what, I will have a working
terminal again.
In looking at the insulating material I have chipped away to expose the
snubber diode, I doubt now that it is epoxy. It seems like some kind of
silicon. I will use metal free (obviously) and acid free silicon to rebuild
the insulating layer after the new diode is installed.
I will post tonnes of photographs and anything anecdotal here.
It may be the case that the snubber diode in your flyback is bad too.
Depending on the failure mode, it may have taken down the drivers on the
video board too.
There are not that many parts on the video driver board and everything is
superbly accessible on all of the DEC VT-1xx terminals. This is a finite process.
I am not giving up on this project. No matter what, I will have a working
terminal again.
In looking at the insulating material I have chipped away to expose the
snubber diode, I doubt now that it is epoxy. It seems like some kind of
silicon. I will use metal free (obviously) and acid free silicon to rebuild
the insulating layer after the new diode is installed.
I will post tonnes of photographs and anything anecdotal here.
Statistics: Posted by beatkamp — Thu Feb 29, 2024 11:48 am
