Original Macintosh 512 no longer boots, need help diagnosing

[PB145B]

Great to see you on this forum Verault! I’m “compaqportableplus” on the vintage computer forums.

 

[Verault]

Thanks! About time I branch out..

 

[Verault]

Just an update, I replaced U1 (op-amp LM324) , no change at all. I am working on getting some type of scope for testing, but U1 isnt the fault.

Any other ideas?

 

[Verault]

Ok been a while since I posted, been busy with work. Still looking into getting a scope however I still want to try some things. All I can seem to find online are parts listings for for the original analog boards for capacitors. Does anyone have a more thorough listing that has resistors, transistors, NPN, Diodes, etc? I would like to know what the original or replacements for these components would be just in case. this thread lists mostly just the caps that I found :





Thanks.