Am Freitag, 3. Januar 2014 23:54:16 UTC+1 schrieb Tom Frikker:
 
Unfortunately, this Lisa came with NiCad batteries which were extremely corroded (the whole motherboard is basically covered in green stuff). I've cleaned off the CPU card so there's no corrosion left and stuck it in my other Lisa 2 I have here (the one with the blank screen from a few posts back). Now when I turn it on, I hear the normal speaker "pop", and it boots up to what looks like a blank desktop and a title bar that says 'H' in the top right (I assume this means H ROMs).

This means your CPU board is working and the I/O board failed.
 
I was thinking this may be due to the leaky C8 capacitor by the 68000, which asserts reset indefinitely if the connection is bad. Is this a correct assumption?

As the CPU starts up and displays some video, the reset generator circuit including C8 is working properly.


Patrick

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