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I agree on both previous posts - clean the board and recap it. That should fix 95% of all your problems.

A few minutes for 64MB, a bit more than 5 minutes. BMOW has a few videos on Youtube demonstrating this. 128MB on your IIfx? I'm Jealous! I only have 16MB on mine - LOL!

Right behind the ADB Port is a Bournes Filter IC.  It's simply a pass-through resistor pack with a transistor (?) in it. They blow out easily. Look through Dead Mac Scrolls (you can find the pdf online) to get the proper IC number and order it and replace it. This Bournes Filter is the scourge...

REMOVE THE BATTERIES!! Clean out the board gently with some IPA. that battery residue may have loosen up some of the traces. Otherwise, excellent job on rescuing two Macs! You can run the IIci without the Cache Card, all it does is increase the CPU Speed some 15%. See if you can find some...

The crystal determines the speed of the CPU in the 68K machines.  So a 40MHz CPU in a 16MHz board will run as a 16MHz CPU.

Scary, as I recapped the few electrolytics on my IIfx Board years ago. I would take the hard drives out and test a new C1 without it, putting a voltmeter on the yellow and black wires on the hard drive harness (12V line). It could be that the Cap was bad, or it could be the PSU as well. Seeing...

Filament 3D Printers are not able to print anything as small as these gears. You would need a Resin style printer with a high output in its resolution. Good thing it their price is dropping and are becoming affordable. Check the frames, rails and cages and compare with the others to see if they...

Excellent project and great work you did there! I will need to dive in as many of my SCSI Drives are whining when turned on, so they are dying a slow bearing death. :/

You should do a small Youtube Channel, though it would on competitions with others, The good thing is I see more Commodore, Atari, Mac and 16Bit systems out there than I see of Apple II systems. I think Chris Torrence is the only one that is exclusively Apple II Hardware Youtuber, while everyone...

LOL! I have an LC case with an LC II Logic Board in it, and a LC II with a LC Logic board in it. I managed to get these systems separately and months apart, so they were not from the same seller. It just happened to happen that way. I could switch the boards around to get them into their...

Love the subject here. My only concern is Overheating and how to deal with it. the LC case does not give enough space for a good properly sized heat sink to be put into place, and the LC Fan is something least to be desired.

Hope I'm not too late on this, but you can use a painter's spatula to shoe between the case and the base and lift the case up bit by bit as you work the blade around. It is not that hard! It is one of the easiest systems I got into once I figured out how. Review the video I posted above to see...

Even if you go cheap by using a CF as an SSD on a G3/G4 iBook/PowerBook, you're talking about Boot times of under 30-45 seconds compared to a hard drive that can take up to 5 minutes, depending on extensions and OS size.

The G4 Mac Mini uses a simple button/coin type battery as used on PCs. I forget the size but it is in a socket. Push on one end of the socket and the battery pops out. Put a new battery in by pushing into the socket.  Should be no more than $4 to replace it and about 15 minutes to replace it...

The LC475 PSU is easier to fix/recap than the IIsi. But it sounds like you need to recap the motherboards as well on both. You just need to get the information to do the information. IIsi PSU info...

There are two tiny caps on the IIsi PSU Daughter Board that causes 90% of all PSU problems on the IIsi. Replace them and the IIsi comes back to life... most of the time.  As an added insurance, one can recap the rest of the PSU. I remember this from a former member who was here and sold caps...

I find that once you recap the board, the PSU works fine on most cases. There a are a couple of large caps inside the PSU you could recap if you like.

I have the actual DMS from the mid 90s.

I too have a 3D Printer, 2 actually. Only one of them would be big enough for such a project. The problem is warping due to uneven cooling when printing. This is a major problem for parts that long and wide and ABS plastic

Using a CF (or any SSD) on a G3/G4, I find best to edit the system preferences to shut off event & crash logging as they tend to fill up a hard drive quick. It has been a very long time since I did this so I forgot which preferences to shut off but it is somewhere on the internet...