[Trackpad_User]

Then it's a bad radio - unless I'm missing something somewhere, because that lights up, so far as I can tell turns on and tunes properly - just without a screen : /

Is there anything inside the radio that can be checked/fixed?

 

[valiant67]

There used to be a company that sold a display fix kit years ago when these were newer and replacement radios were not cheap.
I don’t see any display repair services any more. This may be a find what you can in the junkyard. When I was upgrading to an AM/FM/CD/cassette I think it took three tries to get a good one from the junkyard (which let me return the bad one for the next one until I found the hood one). Once I found a good one, it never failed.

 

[Valiantpatrol]

Based on what I see, your test method is fine. Convinced your display is burned out. In a vehicle you can postulate a bad ground but on the bench any ground is pretty much direct and easily testable.

 

[Trackpad_User]

Yeah, I got a radio with a good display and moved some parts around to get it working. It was definitely the radio, not the truck.