OK After testing the PSU (which seems to be alright) I inspected the 3640 processor card and noticed 2 of the caps have leaked. Anyone know where I can get replacement caps, or anyone have a working processor card they are willing to part with?
You could buy an A3630 CPU board as these are easily available, affordable and useful for testing. But either way, it sounds as though you have a CPU board and/or main board fault so something is likely to need repair. No doubt you've checked the obvious, such as both main board clock jumpers are in the EXT position for the A3640.
From your first post; not sure how it's possible to get a red screen with no CPU card fitted as it's the CPU telling the video section to display the red screen. After power on, the CPU calculates the ROM checksum and compares it to the checksum recorded in the ROM. If they don't match, the CPU sets the video section to display the red screen. Is your monitor in known working condition?
The A3640 capacitors also have
known issues, as do the ones on the main board.
Contact me for a repair estimate if you can't make any progress.
http://amiga.serveftp.net
