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Please add pictures for sure, we never see enough of the ANS's!

IIfx board purchased from @joshc works! Apparently J103 needed to be closed? I've no idea why or what it even does but hey, I'll take the win

I appreciate the honest reply and that you're keen to preserve it for the future too. Thank you for your efforts, I hope to catch one on a future run that you might do, that being said I think I just fixed the IIfx that I would've needed it for. I may be good, for now! xD

Could I politely ask why you are not able to do so at the moment? There's a tonne of dead Macs out there and while I've gotten somewhat able to probe these things via the diagnostic mode and serial, it'd be far more helpful in repairing these machines and ultimately preserving them with a...

I got a question regarding how the power switch is supposed to work. My IIfx will power up properly from the Keyboard and rear switch, and it will shut down if specified in the Finder. However pressing the power switch while it is powered up will not do anything. As I haven't encountered a fully...

Correct, 3400 does indeed use ATA.

I've made progress with Diagnostic mode, it indeed reports an issue with the SCSI Bus. So my guess is probably a bad solder joint or failed SCSI Controller IC (NCR 53C96) - Incidentally, if anyone has a battery bombed board with a NCR 53C96, please hit me up! Diag mode test results Test...

This is quite funny because I just found it on one of my PPC upgraded Quadras today as well. I may compare versions between yours and mine and if they're different, I'll upload mine too. EDIT: Looks like they're the same!

Yep, already done that - mentioned it earlier in the thread.

SE/30s have always had yellow/amber LED's in my experience. Mine has one, although it hasn't been lit in around 23 years as my father swapped out the SCSI drive for a much larger one that didn't have a header for the activity LED. SE and 20SC's yeah they had red ones. Personally I like to go...

Righto, apologies for the massively delayed follow up. @quorten, thank you for your input, your recreation of the SE schematic has been very helpful. So far I think I've been able to verify that RDQ0 to RDQ15 have continuity between the LS245s and the BBU. You mentioned regarding RDO13? Was...

Yes, it's attached. I could swap it with a known good one from my other 950, just in case it might've failed. I guess I could probably test this myself, but by your suggestion the 950 won't get to the flashing ? floppy icon if nothing's connected in either SCSI connector?

Hmm, yeah. The more I think about it the more I feel it would be a SCSI issue. I'll see if I can take a look at the SCSI related IC's under the microscope and see if there's any cracked solder joints. Might give diagnostic mode a try too. Okay, U43 and U48 are 53C96 SCSI Controllers - One for...

Hey all, I recently got a pair of Quadra 950s, initially both ran just great, but one soon developed a fault. The machine chimes, completes the RAM test and loads up video, it looks like it gets to just the point before it initializes the toolbox, and then just hangs. The grey screen still has...

I would definitely like to note down my interest for one of these. These cards are unobtanium so a clone is most welcome.

IIRC the SE/30 utilizes the onboard RAM SIMMs to draw the video buffer, problematic RAM has been known to cause graphical issues. I'll admit I haven't seen it quite this bad, but as far as troubleshooting goes, I'd start with that. I would also try and grab a schematic of the board and trace...

You're braver than me, those things are like made out of glass at this point. I'll be curious to see what condition this shows up in. Best of luck!

Well, I'm back from my vacation, and unfortunately bad news. My IIfx is insta-death chiming again. It's literally been sitting on the side for 2 weeks not doing anything and it was in its semi-working state before I left. So I've no idea what's causing this. I think I'm gonna try bodge-wiring in...

Oh never mind, just saw DarthNvader's earlier post on changing the clock speed here: https://web.archive.org/web/20000418021913/http://www.bekkoame.or.jp:80/~t-imai/ilcpce1.html - Thanks again!

Okay, I'm back from my vacation and installed a 300Mhz card I got from eBay which appears to work. So I guess my original card is toast, and 350Mhz replacements don't seem to easy to get. Does anyone know the process of modifying a 300Mhz to 350? From what I've heard it appears possible?