Looking for some help, I emailed Swemmer electronics and getting I reply back.

I had someone reach out to me to help fix their Diamond Lady. They said they had a new MPU installed and everything was working, moved from NY to NC and now game will not boot. There are no manuals for the board and I have never messed with them.

Game will power on and GI comes on, no display lights and the only lights that are sequencing are the 4 or 5 spade insert lights that will blink down the line, but that’s it. All the led lights on the MPU are lite up as if it is working correctly. I checked all connections and reseated all chips and same issue.

Thanks for anyone’s help

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bumping this again for any help

I see an auxiliary supply power board and a regular power supply board.... both capable for Diamond Lady.... do I just need one or both?

https://www.marcospecialties.com/pinball-parts/MA-767

https://www.marcospecialties.com/pinball-parts/MA-645