Quoted from chrismcb:
Right now I've only tried to put the machine into test mode, so I can tell that the middle segment on the right most two digits are out. I'm not exactly sure what I need to do to get the rest of the display to light up.
It is hard to tell, but yeah, it does appear a bit darker when the display is off. Did I blow the display?
In display test, do all digits cycle numbers otherwise and is it just the G segment out on every digit? Or do you have other issues?
In terms of the darker segment, I'm not sure exactly how an individual segment might fail in a display.. if enough current hit it, it'd probably have gone "super nova".. lighting the segments affected almost pink for a bit and likely damaging or burning the G segments out completely. If it's got a burn mark/dot on the segment on some or all digits (depending which ones were lighting up while the short occurred), then they may be burnt out. If the G segments are just a bit darker or as dark as other segments, they may be ok.
The G segment is going to go to a single plasma display pin.. and then into the plasma glass. I guess another failure mode would be the thin wire inside the display glass for that segment to have taken all the current and blown open. Not sure if you'd be able to see anything on the glass itself. Otherwise, I'd imagine this short occurred while the game was in attract mode.. and only a few digits were being enabled... in which case, if you currently have NO "G segment" lighting on any digits, that may still indicate there's a problem before the display glass. Of course, with replacing the 4543.. and the transistors.. you start narrowing down possible culprits. Continuity between things in that circuit can be checked according to the schematic. You can check the resistors too. At some point it may come down to the plasma glass as the remaining possibility.
Quoted from chrismcb:
I've been hoping to avoid having to replace the displays, as I feel like if I replace one, then I have to replace them all.
Not sure where you're located since it says "Unknown" for location, but you're welcome to try one of my 6-digit LED displays if you're within the U.S. It should blend well with your existing plasma displays, but I'd let you be the judge of that. And I'm currently offering a 2wk return / refund (minus shipping costs) on purchases of single assembled ORANGE displays for new customers of them... that way people can try them and see how well they mix with plasma displays in their game when just replacing a single display or two. LMK if you're interested and we can set something up