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Color code appears to be red black gold gold, so maybe 2 ohms 5%? I'll verify when I have it opened up again.

One of the supplies had this odd rework on the fan speed control board: The positive leg of that capacitor has been replaced by a resistor, and the positive wire for the fan is attached there instead of at the fan connector where you'd expect it to be. I didn't include that cap in the list...

I recapped a pair of Quicksilver G4 power supplies recently. Just the secondary side; everything south of the transformers. I left the rest alone. Unsurprisingly, some of the TEAPOs were bulging, but didn't appear to have started leaking yet. So far, the recap seems to have really helped the...

I tried the PCI card with your Test1 firmware in my G4. It would not boot to OF or Mac OS with the card installed; just a bong and a black screen forever. I had the monitor connected to a different, known working video card, and the system works fine with the PCI card pulled. I put the PC ROM...

Thanks @joevt, I should've figured you would have a couple Powerbook ROMs stashed already :) I don't have any particular affinity for version 113-XXXXX-119 of the ATY,RageM7 fcode, it's just the one I happened to find a System Profiler screenshot of. It would be interesting to know whether...

@Epictronics, seems like you should be aware of this if you aren't already: https://68kmla.org/bb/index.php?threads/early-macintosh-home-brew-4mb-memory-upgrade-board-development.47308/

Thank you for offering to help! Unfortunately, it's looking trickier than I hoped... I just checked the readme for the ATI ROM dumping and flashing tools from Graphiccelerator, and it says: "Note that on-motherboard graphics cards (iMacs, eMacs, PowerBooks, iBooks) are not supported by the...

Oh wow, that's a blast from the past! I remember using that years ago but had forgotten all about it. Thanks for the suggestion. I was also looking at BOINC, and while the client is still available, unfortunately none of the active projects will provide work units for 32-bit PowerPC :P

I have a few G4 chips I'm trying to find the limits of, so I'm trying to come up with a good stress test, either in OS 9 or X, to confirm that they're stable. Does anyone have a go-to method for this? Maybe a long code compile, encoding a large video, or looping a benchmark utility?

Specifically, I'm looking for the "DVI" model, A1001 (EMC 1913), M8591LL/A or M8592LL/A. These have the ATI Mobility Radeon 7500 GPU. I happened across a PCI card with this chip on it, and I'd like to see whether I can flash it from PC to Mac, so I'm looking for the video ROM from the...

Maybe the service is getting 403'd by Macintosh Garden, like a lot of people are now? They seem to have gotten really aggressive blocking ranges of IP addresses lately.

@herd I had to bust out the 20x eyepieces for my microscope, which I never use. In the process of doing this, I learned they are crap, so I probably won't use them again. Nevertheless, I was able to capture this: I think I see 7 distinct internal layers there. They look like aluminum. None of...

Thanks @Daniël! I remember you gave me some good advice when I was first starting to do BGA soldering, I really appreciate it. The cache is 3.3V so 7410 is a no-go. I do have some extra 7400s on hand, so there's no telling what might happen to this spare 400MHz G3 card eventually...

Thanks all. This started as a series of updates via PM to @Byte Knight, and he encouraged me to compile it into a post. I'm glad I did. @herd, I will take a closer look at the substrate of the broken CPU for you. I don't think much if any of the die is visible. Do you want to dissect it...

While I had the CPU off the card, I did some poking around and found the PLL_CFG resistors. Maybe this will help someone someday: You're probably not going to get much more out of the original processor than Sonnet already did, though; most of these are overclocked from the factory. This...

I sold @Byte Knight an ATI Radeon 9800 Pro that I repaired earlier this year, and he asked me about this card, reasoning that if I was able to repair the video card, perhaps I could repair the CPU accelerator too. I agreed to take a look at it, and here's what I found: First of all, the ceramic...

Hi Mike, sorry to hear about your damaged board. As always, the first question is: which part of the US are you located in?

Hi @haramia, just catching up on this after a busy weekend, I responded to your PM but I see you posted newer updates here. Sounds like you lifted the EECS pin on the VIA chip off the board like I suggested. Weird that you never see it go high. The AT93C46 datasheet states "A valid instruction...

I just came across these connectors and remembered this thread, so I'll drop the link here in case anyone wants to experiment: https://www.surplussales.com/items/107804/db-19-d-sub-male/

My approach when working without a schematic like this is to just get the one with the highest saturation current that physically fits and meets any other known specs. If there's an extreme cost difference, just "pretty high" or "higher than average" is probably enough, considering we're dealing...