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I only had one CP-3045 Macintosh Portable hard drive and it just kept spinning up and down. I opened it up and cleaned off all the goo but it was still the same. Turns out it was the mechanism rather than the controller board and I was able to swap the CP-3045 controller board into a standard...

Thanks for the advice. I’ll look into the things you suggest. Regarding my comment about testing in another fully working PowerBook, I meant I fitted the problematic logic into another PowerBook 100 that was working i.e. every other part except the logic was known to be good. The chime looping...

I’ve recapped a whole bunch of PB100 recently and they all had the backlit blank screen issue. The first one which I recapped with tantalum caps still had the same symptom when I retested but weirdly worked perfectly the next day. But a few days later it started randomly doing it again. It is...

I had exactly the same symptom on a PowerBook 100 but the backup battery switch did not solve if. For me, it turned out to be the main 5A fuse, F1, that had blown. As soon as I shorted that, the problem went away. I’ve replaced the fuse now and the board is fully working. I hope this helps others.

I have a PowerBook 100 that powers up but chimes about twice every second indefinitely until power is removed. I’ve replaced all the electrolytic caps and tested in another fully working PowerBook 100 so it’s definitely the logic board. I’ve inspected for any damaged components or corrosion but...

I have a number of early PowerBooks like the 180 which have the same issue and I’m wondering if anyone knows what causes this or how to fix it. The display works fine and when first booted is fine. But then over the period of a few minutes, the corners get darker and this spreads in causing a...

I've just posted a reply to a 2017 thread about repair of a Lisa power supply but maybe I should have messages you firstly. Anyhow, you seem very knowledgeable about Lisas and so wondered if you could answer another question about internal drives. I have two Lisas; one came with a ProFile (sadly...

I have a very similar problem. I have two Lisas; one fully working and another that one of the main safety caps in the PSU had blown. They are both the Datapower 180W PSUs. I've replaced all 5 of the yellow boxy safety caps and the two huge round caps.  I normally run power supplies through a...