Why does a simple fix turn into a hair pulling exercise?
So... the joke starts like this. I decided to swap #3 & 4 numeric displays because # 3 was no bueno and included #4 because I wanted the 2 matching/working ones from a Space Shuttle that I'm going to upgrade. I power it up, and happy to see all displays working, but unhappy to see the #4 10s zero staying on and actually getting brighter when the display presents all the digits lit! So now my new problem exists where there was no problem before. Let the hair pulling begin....So I swapped connections and lit zero moves to #3 display. I swapped complete ribbon cables and it stays on #4. At this point I'm thinking it's in the display board so I take my limited testing skills and check everything my Fluke will let me, which is only resistors since there are no diodes there. They all test good. I tried to read the schematic from a downloaded manual and it was a challenge due to questionable clarity and the display circuit is a tougher animal to decipher. I did look for any previous Forum topics with similar display issue(s) but no luck. Maybe I missed one? Anyway, my crazy guess would be a short somewhere but I don't know where to look at this point. I'm not even going to ask why it happened with the replacement of the new displays, kinda moot right now. If anyone knows of a forum topic that has some good info, please share. If anyone knows the easy or not so easy fix, please share. Or...at least a finger pointing in the right direction.