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TRS-80 Model 4 video board availability

A

arnuphis

Member
Joined
Sep 1, 2020
Messages
46
Hello everyone. I recently acquired a gate array model 4 that only displays a raster on screen. It boots a disk and responds to commands such as DIR etc. but nothing is displayed on screen. Both adjustment pots are good and I suspect the fault lies on the video board, Is there a source for replacement ones?

Thanks in advance.
 
There are good service manuals for the Model 4 Gate array. Why not have a look at them, and try to
see what is wrong with the Video card.

Larry
 
I wanted to get a working board to just confirm the fault lies in the video board and not elsewhere before I go trying to fix it. However after fixing up the model 3 that I got at the same time as the 4 I finally had a chance to pull out the video board and examine it. I think I may have found the problem..

video board.jpg

The broken off piece was stuck in the connector. Hopefully some TLC can fix it. I did get another video board which works fine so I know I have a good model 4 to test my repair in.

on an unrelated note. What is a good paint color for the model 4 case? Its a bit scratched and I want to give it a repair/respray. I did the model 3 and it looks really nice now.
 
Last edited:
I have no clue on the Paint for Model 4. There was a long posting in the old forum of a guy that
had the paint color matched and put in aerosol cans. But, no color stated in the posting.

I don't have a clue what type glue would hold the PCB in place to repair the fractured piece.
You might try posting a question on the Forum as someone has likely done this before.

Larry
 
arnuphis said:
The broken off piece was stuck in the connector. Hopefully some TLC can fix it.
Click to expand...
Surely if you know what to do. It's possible but there are some steps to do. At least I have an idea what I would do. If you need further assistance let us know.
-Rainer
 
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