Hey all, figured I would post here for some help as a last resort before sending the board out for repair.
I have a Cyclone MPU that just won't boot. I have good 5V (indicated by LED and DMM), good ROMS and good CPU chips, clean overall. I had a local buddy with the same board so I could swap what was socketed and nothing helped. Neither the diagnostic or blanking LEDs light up. Sometimes I get the start chime, but usually it's no sound at all, or an annoying squealing noise.
The power supply has been recapped. I even tried a brand new rottendog power supply and had the same result. Then put my buddies working MPU in and it booted fine with both power supplies, so I'm confident it's an issue with my board.
I have a DMM and a logic probe so I'd be glad to start probing some chips with your help to narrow this issue down and I have faith that we can do this over the internet I did search quite a bit regarding System 11 boot issues and nothing I checked narrowed it down anymore than where I'm at.
I've attached a few pics of the board, only minimal "corrosion" up near the top resistor packs..