I have also replaced the top board in the lower P/S with a verified working one. So far I verified my I/O & CPU board are working correctly (Sent it to another member to test in their machine). Yes, I'm unfortunately still dealing with the same issue. I am so lost on this so any advice would be amazing.

Unrelated or maybe not, my bill validator accepts bills but doesn't issue credit to the machine not sure if that helps any. Initially, the fail light went off after reseating the chips and playing the 10 or so spins, but once it went into TILT again that light came back on. So reseating those eeprom chips did something to give it a little bit of life when restarted but it was short lived. Essentially it went back to the original problem. Played about ten spins and it went back to TILT with no other codes, dotmation screen went to PLEASE WAIT CALLING ATTENDANT. The reels spun once automatically (but very loud grinding noise coming from them) and then it was like the game was back to normal. like it was running thru a self test or something. After doing so and restarting the machine, a list of codes starting appearing in the credit and win meter windows stuff like door Poff, Secur Poff, Bill Poff, etc. Someone suggested to reseat all the eeprom chips on the motherboard. This machine has been running without issue since I got it about 3 months ago. The machine will also bong once after restart followed by a half of a chirp which is definitely not normal. When the machine is restarted the dotmation screen will light and show WILLIAMS and the software/firmware version but then after about 10 seconds goes black. The top Award glass fluorescent & belly bulb light up but the other lights on the buttons and face of the machine are not lit. All 5 lights on the CPU board are lit as well as the 1 FAIL light on the left side. The Admin mode button on the card cage does nothing when pushed. There are no codes displayed in the CREDIT and WIN METER windows. Overnight, the machine was running and went into TILT all by itself. I have a WMS Jackpot Stampede deluxe game with dotmation.

Wms 400 slot machine reel tilt