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Another push and twist practitioner here, for what it's worth.

Thanks! Now I have a reason to be optimistic. I will post my results when I get around to playing with them.

@stynx I recently found a decent deal on a pair of the same IBM dual CPU cards with 350MHz 604ev chips, so I bought them to play around with: Do you remember whether the CPUs you got from these cards were version 10,1 or 9,31? I hope mine are 9,31 so I can use them on Kansas CPU cards with a...

Pop open the door and take a picture, lots of experienced people here will be able to tell you what if anything is missing.

The aluminum polymer caps recommended by finkmac above are nice because they are sized correctly for the pads on the logic board. No risk of shorting nearby traces due to solder mask damage like there is with tantalums.

Early ADC G4s supplied 28V, but the later ones (like Quicksilver and MDD) were 25V.

Not a proper LCR, just a Chinese cheapo. No indication what frequency it's testing at.

Isopropyl alcohol is not a great solvent for the corrosion on these boards, and soaking it overnight would just be a waste of time. My method is to remove all the SMT electrolytic capacitors first, scrape any visible green corrosion from chip legs with a dental pick, then submerge the board in...

Love to see you're still having fun with this (even though I'm sure some of it has been Type II), all built upon the mighty Bombat platform 🙂

@jmacz and @s_pupp, that makes sense. Did you measure the capacitance of any of the parts you removed? One thing I've observed and recently begun to understand is that old capacitors that have no visible signs of failure will sometimes read significantly higher capacitance on a simple LCR meter...

@trag A modified 7100 ROM DIMM has been used to boot an ANS: https://68kmla.org/bb/threads/mac-os-on-ans-modding-a-rom-dimm.51120/

My experience matches Phipli's, although I think I had a leaky 6100 years ago, and that's a 1994 machine. My 5400, 7600, G3s and G4s are all fine.

@Unknown_K Would you be willing to check whether any of them have the hynix -33 RAM? I haven't been able to figure out the timing issue with mine, and it's still bugging me. I think I have backups of all the ROMs from The Mac Elite, but if anyone else wants to try archiving it, the more the...

Or modern 1.2mm thick SIMMs, which seat badly.

I'm not sure whether the X800XL could be flashed. As far as I know, the only official Mac AGP X800/X850 cards are native AGP (R420 core). The X800XL uses a different core (R430) without AGP support, with a PCIe-to-AGP bridge chip. I've been buying and flashing AGP video cards for G4s for a...

Does the dual-link DVI port work with a lower-resolution monitor in single-link mode? Unfortunately my Mac collection stops at G4, and I don't have any large monitors at home, so I don't have any experience with dual-link DVI beyond reading about people having problems with it. Seems to be...

Great info, thank you @zigzagjoe. This one's not in The Dead Mac Scrolls. I repaired an SE/30 neck board that suffered the same fate as @SpocksBeer, and the system displayed exactly this failure mode. New 2N3904 at Q1 and it's as good as new. I only wish I'd found this thread sooner, before I'd...

RTL8139 is 10/100; what about it is demanding? They are still widely available for $20 or less. RTL8169 also works and is gigabit, but you won't get gigabit speeds in classic Mac OS. Anything with a DEC 21140 controller will also work, as that's what Apple used on their branded 10/100 PCI cards.

No output and no apparent damage is the most difficult starting point for a repair, I think. My experience in those cases is that the GPU is usually dead, but I would start with the basics: does it have the correct voltages and clocks? The positive sides of capacitors are good places to check...

This is a false assumption. Apple and their suppliers used several different models of cache SRAM, some of which, including the Samsung part number above, are compatible with both 3.3V and 2.5V I/O. However, all the ZIF boards run the cache chips' core and I/O supplies, VDD and VDDQ, at 3.3V.