I bought a Cyclone awhile back thay had pretty extensive alkaline damage on the MPU, however it would boot and play about 75% of the time. If you left the game on for awhile. It would eventually crash mid-game.
This is a keeper game for me so to enhance the reliability, I purchased a Rottendog aftermarket MPU/driver board. With these you have to swap over all your ROMs, PIAs. and processors.
The board worked great for about 3 weeks, then it started crashing mid-game again. Now it won't boot at all.
5v LED comes on. PiA LED flashes. Then the blanking LED flashes.

See the video.

This has to be one of the chips right?? Both boards DID work at the start. I've swapped out a few PIAs, no real change.

DISCLAIMER: Don't click if you're wearing headphones, the machine "chirps" loudly when powered on

Getting back to this; I've replaced all the PIAs and rhe 6802s. There is still no change. The board still won't boot. The only thing still original are the ROMs and the NVRAM included with the board.
I'm really not sure where to go wirh this thing next.

Update: Just for fun, i started swapping out PIAs again one by one with some of the original 6821 chips. Found the issue! Even though I had all NOS or "used pull" 6821s from Pinball Life, U54 had a bad PIA. Found another bad PIA in U109 casuing the sound to act up.

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