Pinbot came home this weekend, and my first task it to try and get the two upper alphanumeric displays to work. They are currently 100% out. I've been doing some reading in the forums and have tried re-seating my connectors. Is this how the boards typically fail? (Out VS Dim or Flickering). Do they most likely require replacement or is there some components I should try re-heating the solder on etc etc.
Any tips would be appreciated. Or any leads on some new glass displays or X-pin conversions for sale.

Thanks for the pointers,
Pat

That's part of the trick figuring this out. The bottom displays are just numeric, and the uppers are alphanumeric. So I don't have a "good" board to try and swap in. It's too bad it's the uppers, because my game came with some spare lower numeric boards.
Thanks though

No problem, I thought they were all the same at first glance too.

So I've done some tinkering. I believe I've proven my ribbon cables ok by swapping them into different positions. From main board to display board and from display board to individual display board. The lower numeric displays are never effected.

Is there a common IC that goes bad, or a trouble spot on the display board that commonly needs repair?
I have a feeling that the displays themselves are good. Appear to have been replaced recently.

Looking for my next move to exhaust before throwing in the towel for x-pin displays.

Thanks for all the help guys.

Resistors and diodes look good. Basically new. All my buddies just have stern games, so I'm thinking of a different test.
I have a spare numeric board, that I may try and use with jumpers from the alphanumeric output on the driver board. See if I can get even 1 section to light up. +100dc, -100DC, 5VDC ... does this make any sense. Too risky?

Well, I lined up the supply voltage pins with my numeric score display and player 1 appears to be working. Test passed. Now I just need to round up some original glass alpha displays. Thanks to everyone that chimed in, and vid for the pm and recommended reading material.