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I can put a V1.0 one in the post if you want, I have 4 PCBs I don’t need … it needs a couple of bodges so you may prefer to do your own run when I upload the V1.1 gerbers Also since when did you acquire an 840AV?

I’m using a Logitech Bolt receiver on a MDD under Mac OS 9.2.2 and it works fine with my MX Master 3s. Funnily enough installing USB Overdrive caused the mouse to stop working.

See this video by Branchus Creations starting at 39:05. He talks about adjusting the leaf spring after the top head is lifted too high which should help you.

Still stable?

The tantalum’s positive stripe notation is dumb and has tripped many hobbyists up, so don’t beat yourself up too much. It’s a painful lesson but at least you know now.

I’ve just tried to install this version (3.5.0b0) of MACh Speed Control on my Dual 867 MDD running Leopard 10.5.8 and it errors out, saying it doesn’t support the processors in the machine. Very odd.

Enjoy the AppleVision 1710 :) When working, they’re outstanding displays.

Nice work - thanks for sharing. Is that enough USB ports on your iMac? :p

In that case I would clean it up as best as you can and then use a multimeter to check traces and run repair wires if needed. I don’t think cleaning alone will accomplish anything though. Those two HC132 chips do get killed by cap goo but you might be lucky and only have trace damage.

Those chips need to be replaced for new - they’re available. They should be lifted and the pads cleaned up and any broken traces made good.

You'd lose the optical drive and have a big gaping hole in the front bezel. (n) I'd vote for a nice ZuluSCSI Pico Slim on the rear port. They have Dayna emulation & you'd have fewer issues with attenuation & you can easily swap out the SD card.

Would you be able to (practically) connect a BlueSCSI internally to a Performa 630/5xx0/6xx0 style machine, with their IDE hard drive?

The PSU is indeed what needs recapping on these, as they were heavily affected by the capacitor plague of the 2000s. I just recapped a dead one (which had a few that were bulging) and it's come back to life.

Noticed an error in the diagram for Board D - I've got C592 twice. The one near the top of the board should be C546.

I thought @dougg3 discovered that the right type of ROM SIMM automatically disables the onboard chips by means of a pull-up or pull-down resistor on one of the pins.

The PSU passed the smoke test and is working great, including the monitor passthrough. My 840AV is running for the first time as a complete machine since I acquired it. Between the logic board, PSU and case repairs, it's been an immense amount of work – but totally worth it. I need to make some...

Photo updates after assembly and fitment testing. Now I'm ready for the power on test tomorrow. I got the base/collector/emitter pins mixed up on both fan control transistors for some reason, so a few bodge wires were needed. It took me most of the day to figure it out. I'm pretty pleased with...

It reminds me of the Muffin Top episode in Seinfeld or when Cartman eats the skin off every piece of chicken and Kenny starts crying

Who are these people who strip these cards down for no good reason

That’s a good point. I’ll tweak them for the next (release) version.