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Ahh, I thought you were using a scope or logic analyser or something that was picking it up… 😅

How can you tell how and what the resistors change?

If that board doesn't require the slots to be populated, I don't see why they would need to be there.. other than probably would be good to have them available for diagnostics before you start adding on external components.

Oh and I’d also suggest replacing UE8, UF8, and UG8 as they often fail and again pretty damn cheap

I wouldn’t bother trying to save the board, it’s multilayer and the traces running under it will almost certainly have been damaged. Doing a reloaded board is fairly easy.. time consuming and annoying at times (some parts are a PITA to remove). You’ll want to at the very least get replacements...

Oh now this is exciting. A friend has an ANS that I was going to be 'borrowing' for a while (due to size).. that would be a fun project to try out!

Oh absolutely, and it is in very good condition too! I just wish I’d had a better look for the bottom case bit. Fortunately it’s almost identical to the snow iMac case (sans the pink Apple logo at the back) so I can always grab one from a dead one of those to replace it

Yeah basically. I so desperately wanted to save a graphite iMac that was next to it, but I didn’t want to get rumbled and have to put back the flower power! Don’t suppose anyone happens to have a white bottom case for one of these?

Oh.. that's what I've been doing wrong!

They're a different size.. the floppy connector is further away than the original... different port config at the rear.. power supply is configured differently (although I imagine it could be adapted fairly easily since there's no soft power on either model).. Wouldn't it just be easier to...

As I recall, There’s a lot of ram slot traces on one of the internal layers of the PCB that run directly under the battery area, which may have been damaged even by a light leak, so might be a good idea to tone those out too.

Curious.. I wonder what could be causing that. Bad resistor perhaps?

Oh maybe it is! I think I misread it!

Out of curiosity, have you tried using the full 040 card from your 520 in the 550? See I have a 540 and a 550 prototype which has a 167mhz 603e upgrade card in it, but there’s no sound. It doesn’t work at all with my 540’s daughter card. Me and @croissantking have discussed this and we...

Does this help? http://rtfm.vtt.net/pinouts/data/NuBus_pinout.shtml.htm I’m not familiar enough with all the fuses on the IIci board, but checking the voltages on the above links pins should help rule that out as a cause.

I just want to clarify... do you mean you checked the voltages for the battery.. or the PSU voltages getting to the relevant pins on the nubus slots themselves? The reason I ask is I recently had an issue with a IIcx where certain things weren't getting power, and I think that also included the...

Nor do I, but the troubleshooter in me likes to cover all the bases, especially for something simple to try! If it’s working with another board, my gut instinct is an issue with the onboard memory. Or, possibly a chipset that’s only activated when part of the system calls on it during...

Tried an OS other than 9.1? Maybe 8.x? I mean.. it shouldn’t make any difference.. but it could potentially highlight an area of interest depending on the outcome?