Hello!

short introduction to the source of pinball problems:
My shadow was a fine working specimen before I had to dismantle the playfield as a favor for a friend who needed plastics. In the meanwhile I lost the pictures and the papers of the tear down and didn't have the exact locations of the screws. It stayed semi dismantled for several years. I finally got to assemble it together and then my little daughter pulled out a credit keyhole that some operator put there.

Because it's a hack I don't know how it's been wired, and I wanted to restore it to a working state. I left the credit keyhole unconnected. I just found an unconnected yellow-gray wire near the start switch and a yellow-red wire without a connector. I connected the yellow wire to the start button as it looked like it belonged there by the pics and schematics and soldered the white-red wire to the interlock-memoryprotect switch that had a lower side lug without a wire as it looked it belonged there.

it had some slam tilt switch errors that I didn't come to solve because it stopped booting abruptly. Before the booting problem, the display had offset text (superscript and subscript like) for quite a while. I have ordered PLCC extractor to reseat the ASIC in the future if this happens again. Currently, the situation got worse.

When it doesn't boot, D19 CPU led stays on, D20 is off always and D21 is on always.
When I remove ribbon cables it boots with D20 blinking and D19 off, but I can't do anything because the screen is off.

I reseated all ribbon cables several times and got it to a state where it boots with all ribbons on, but the screen is garbled and frozen and because of some other error I cannot do anything to change the state.

I reseated again several times and the best situation now is that it boots with the ribbons on except the J201 ribbon. I hear the beep that the sound board is ok and nothing else. The unconnected ribbon looks best of all the ribbons there with no apparent pin or cable damage.

I have ordered the ribbon set from Portugal, it won't be here for at least two weeks. I don't have pinball services or supplies near me, closest is in another country.

Is there anything to try before the ribbons arrive? Am I right that the J201 ribbon is the culprit? Could have something else causing the problem?

before this, I had the slam tilt error reported or wall target 33 switch (which seems fine) and the service buttons go crazy cycling through the menus and the volume goes up so I have to shut down the machine. I presume this has to do with those wires connected to the credit keyhole drilled in the cabinet (near the start button), but there are no loose wires anymore?

thank you

my PLCC extractor came in the mail, and incredibly...the problem for all the gremlins was the ASIC chip. I didn't manage to pull it out as it was too stuck in the sockets, but I dislodged it a bit and then pushed it and did it several times. Voila - it worked. Machine boots and it works normally.
for future reference ASIC chip reseating solved these problems:

- machine not booting with a J201 (to J601) MPU to DMD board ribbon
- all text on DMD being offset up/down like one letter superscript and next letter subscript and repeat
- service buttons not working properly (cycling automatically through menus and volume increasing to max level without a possibility to decrease it - volume down button didn't work)
- phantom door slam tilt switch error (I checked and it was fine)
- some phantom switch matrix errors (wall switch and swtich 31).
These last 4 were happening before the machine stopped booting

I was very lucky as this was the absolutely cheapest solution (price of the PLCC extractor thingy) and no need for anything else.

Thank you all.