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It's been a long time, but IIRC, it was the replacement of 1 of those ICs that did fix my problem.

Well dang, I wish this 630 would have had the DOS compatible part still in it. :)

Picked up a couple of Performa 630 computers and one of them had a motherboard I had never seen before. In addition to 2 memory slots, it also has a connector at J14 that looks like the video-in slot but smaller. I don't see this referenced in the service manual. Does anyone know what this is...

@mmu_man Just an FYI, the new CPU module fixed my problem. The G4 MDD boots and works great now. I wonder if the cooling on these become compromised over time with dust and dried-up thermal compound? Anyway, the dual 800 CPU module is working, though I would prefer to have a single 1.25...

Yeah, I always put a heat sink on the 040 and on the valkyrie (video) chips.

Any updates @mmu_man? The PSU in this MDD is a Samsung and outputs good voltages, but I decided to re-cap it anyway. After doing so, I still get a black screen, no bong, and then fans rev into over drive. I took off the CPU heat sink and WOW, the CPU was HOT HOT HOT. I'm thinking maybe a fault...

I have one of these and didn't need to "bend the rails" to install, but rather flexed the metal chassis wide enough to fit the logic board back in without sliding it like you would normally do. it's tight, but works fine.

Just picked up a dead G4 MDD with similar symptoms. Going to start diagnosing this weekend and will post if I get any signs of life.

Wow! This post got necro-bumped. I did end up buying the G3 desktop (2 of them actually) and combined them into a single, very nice specimen. I do love the machine, just wish the plastics weren't so brittle.

A very royal LCIII! Looks awesome in purple! Really impressive all the reverse engineering that goes on in this hobby. Very cool stuff.

Lucky trash find! I never see stuff like that here in Seattle! It's always just an old couch that's been sitting the rain for days. Yuck!

Immersion method works well. Be sure to pop out the rainbow apple logo before taking a dip in peroxide!

I've always thought that classic Spectrum games would look quite good on the Mac's 1-bit screen.

Peroxide and metal don't like each other, so it's always safe to remove any metal shielding before dipping your plastics into peroxide or you'll have rust to deal with.

Awesome! Love these projects! :)

A clear LC case would be very cool for sure. In your OP, you mentioned eventually working your way through the whole LC series. Curious if you plan to actually remake each model, or make some sort of "new hybrid LC" with features you like/want? Looking forward to your tests!

Not sure which CF card adapter you are using, but I'm using this one in my Performa 638CD: https://www.amazon.com/gp/product/B0026OYEEQ To make it fit, I designed a simple 3D print mount: https://www.tinkercad.com/things/e2Cub52P3B6-performa-630-hdd-mount/ In order to install everything (it is...

Let us know if Herb has any. I'd be in the market for one too. :) Thanks!

Wow, that was fast! Hopefully your first build won't have too many issues. :) I love the LC form factor as well and it's great to see these projects. Eagerly watching this. :)

I have a 630 bumped to 40MHz and it's nice having a compact 040 machine with built-in CD and floppy with external SCSI support. With a CommSlotI Ethernet card, it's on the network too. Not the best computer back in the day, but a good retro 68k Mac in 2021!