This pin is driving me crazy. Day after day I'm getting a little closer to playing a good clean game but now I'm stuck on lamp matrix issues. I hope someone can dumb down a solution for me. I went into test mode for the single lamps. Every "single" lamp I tested turns on 2 or 3 lamps in the same row but different columns. Example: column 1- row 1 "Thing Multiball" flashes but so does "Upper Left Jet" in column 2- row 1. So each lamp test will turn on another lamp to the left or right column or both, and always in the same row. Every single lamp turns something else on in the same row but different columns. Something this big isn't just a short somewhere, right??

Thanks for all the leads. Pulled the connector off the mansion and still had the problem. I've looked for a short but haven't seen anything obvious. Checked the two lamp boards in the middle and they have correct connections. I thought I was onto something with the pop bumpers flat straps for the bulbs, I thought maybe another lamp socket was on it so i moved it over and still found the problem. I checked the diodes on the straps and they are all good. The machine had some LED's and I moved a few around and replaced some incorrect ones. So, yes it has some older and newer LED's. I'm not familiar with "ghosting", what is that and how could that be causing all this??

There doesn't seem to be two lamp boards with the same or matching connection. I pulled the connections off all lamp boards and still have the same problem. This CPU and Power Driver board are new so while it's possible they could be faulty, it just not probable.

With the connections pulled from the lamp boards that would just leave the individual lamps, so i guess that narrows it down a little. I wish i could test something from the connections at the power driver board. Are there certain connections that I could test continuity or something??

I have disconnected all light boards and still have problem. I have gone through and tested the remaining 19 lights with diodes plus the 5 pop bumpers diodes. Is my count correct?

Back to the LED ghosting statement earlier. Can anyone explain what that is and how that could be creating this problem? Should I buy a bunch of old school bulbs and replace all the LED's? Is a mix of LED's and old style ok?

After swapping new and old boards light problem seems to have cleared it's self with the old board. The Rottendog board still displays the lamp problem. I don't know who, how, why or what but the lamp issue is no longer an issue. Thanks everyone for your suggestions!

Update. Now i have a problem with the bookcase running non-stop and Thing hand not working. I'll work on it a bit and post a new message under a different title if needed.

Finally, all problems solved. Not sure how the problem with the bookcase and Thing were tied together but the machine certainly didn't follow the schematics in the book. Long story short, re routed some wiring, replaced a couple connectors and I'm back playing again! Thanks for everyone's help!