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What solutions are out there for the Macintosh II/x/fx series? I saw this https://www.instructables.com/Macintosh-IIfx-Modern-Power-Supply-Replacement/ but am wondering if there is a less complicated approach or solution.

The power plug on my riser board does not drive the original nor a new replacement fan with 12V anymore. Is this power source controlled by a temperature regulator that only enables voltage upon reaching a certain temperature limit?

And another update: The CRT went dark again. I noticed I could reproduce the issue by turning the brightness knob. It's now been removed, taken apart and cleaned with Deoxid. Seems to work now reliably. Let's see...

Yes, it's second sourced. Would it make a difference with the Motorola 68000?

I'm adding a full view picture of the logic board. Ignore the ROMs, they are from a Plus. I also added a 68000 CPU following @Bolle suggestion, though no further progress with it. Is it normal that the LBs of the Plus have a diode factory installed at CR1? I thought not (as it would provide...

Thanks, that would be fantastic.

@PacificState great write-up, thanks! I'm going through the same process right now. Regarding the fan: I noticed only 5V on the PSU plugs for the fan, though on your picture, I saw your new fan is a 12V fan. Does it actually work?

Thanks @lobust . The Mac Plus works with a known working (other) Logic Board. Sorry for not writing that clearer in my post earlier. Also, the 68000 CPU of the stock Plus runs on 8MHz.

Here's the logic boar in full view. I bootet it as follows: - without the 68000 - with the ROMs from a known working Plus. - without the ROMs Same results as described earlier for each of the two tests scenarios. I now ordered a 68000 CPU to test the board with it too.

I managed to power the board up and got this screen. Any thoughts what the issue could be? No startup sounds at all. The analog board is known working and was fully recapped. The Mac works without the accelerator.

They both are 10uF/16V, just different sizes. Thanks for checking the picture nonetheless. Here's another picture of them:

And which open sourced application would deliver the biggest value to the Apple retro computing community?

I'm looking for the manual and any installation guidance for this Accelerator. The board replaced the 68000 CPU and was soldered directly onto the logic board. It came with a separate power supply:

My 512k had the same issue and reflowing of these pins helped to fix it.

I've recapped a IIfx PSU. It turns on as expected, though the resistors R26 and R15 of the PSU get very warm. After a couple of minutes (less than five), R15 is already at 131.7C (269F). What could be the issue with them? Or is this normal? I suppose such a high temperature is not desired...

I managed to break off a part of the "floppy disk in drive"-sensor part in the 400k drive. Does anyone have a STL file so I could 3D-print it?

I see - and sorry for the typo. I meant to write "out" not "not" :-). The Colour Classic I worked on underwent a full recap. I can highly recommend doing it for yours too. It'll have to happen anyway so why not do it now?

Just not of curiosity: How did you measure each capacitor? Did you desolder each of them?

Another update: The CRT went dark again. I investigated further and reflowwed all connectors. This must have solved the issue more reliably. The Mac runs now reliably.

Update: The 512k Mac screen stopped working shortly after I had put it together again. I then decided to replace the BU406 with a new one and voilà, it's working again.