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So, quick update. I actually received my Mouser shipment today and decided to swap out U2 as that was a recommendation I had seen for similar issues. Put in a new IC from mouser, fired up the Plus, and my picture is back! The geometry is all messed up from my adjustments, but I now get the...

Yeah, I've heard the power connector on these is prone to losing its connection. I'd start there.

I do. If I swap in a working board from another machine the image is fine. Although I'm a bit nervous doing stuff around the high voltage stuff on the analog board. Reading the voltages for the logic board is something I've done. What specifically should I be looking for?

No, no disk icon or desktop. However, it appears to be loading from disk (according to the lights on my FloppyEMU) so it feels as though it is booting.

I actually re-soldered all 3 J connectors, as this board came from a machine that would power on with no image, which was fixed when I reflowed a couple of noticeably cracked solder joints. So to be safe, I removed the solder from the connectors and re-applied fresh solder to all the pins. I...

I'm kind of shocked on doing research into this one. I've found several instances of people reporting this issue on various forums (reddit, 68kmla, etc.) and so far none have fixed the problem. Some just stopped messaging, others said they put the machine up for auction / parts, but I haven't...

On the Plus, there is no adjustment on the flyback, so I'm guessing the G2 voltage is the cut off voltage controlled by R53. I could be wrong, but I didn't see any other adjustment on the flyback itself. And it made no difference. I also re-soldered all the pins on the connectors to the yoke...

Looks like your analog board is dealing with a similar issue to my Mac Plus: https://tinkerdifferent.com/threads/diagonal-lines-on-macintosh-plus.1436/ Let me know if you find out the cause and I'll do the same.

I was running a longer duration test of my Mac Plus (with 030 accelerator) and came back into the room to find the picture was gone and replaced with diagonal lines and the image was stretched beyond the edges of the CRT. I tested my voltages and they are stable and within spec on 12.0v and...

True. It could have nothing to do with the master / slave config and something with you using multiboot. The master/slave config and the multi-boot feel like the two most likely candidates.

I've gotten most on my list: SE/30, Cube, TAM, Color Classic (with Mystic), Performa 6400 running BeOS (obscure one), NeXT Station, iBook (still would like a lime green one), Apple IIc+, the Apple 17" Studio CRT, Flower Power iMac g3. The remaining items I have on my list are a NeXT Cube...

If it is an issue with the master/slave identification, that would point to a problem with the case, as it is responsible for controlling the master / slave / cable select behavior for IDE, as the mSATA drive doesn't support that natively for an IDE connection. If you look at my case, the...

Ah, that makes sense. Build one PCB that could be used for both 020 and 030 accelerators. Having PCBs manufactured was probably a lot more costly to create the tooling, so for lower volume, making a board that served both purposes would probably save money.

If you go back to my earlier post, I have that in my Cube and don't have the issue you are seeing. Not sure if it's your case, adapter, or SSD, but it's not a problem with using an SSD. Although I have two cubes and I think one is using this adapter...

Also, anyone know what the empty U12 socket would be used for? It almost looks like a second CPU socket.

Sorry for the delay, been traveling and busy with other things. Anyway, here is a comparison of the two different PLAs. Comparing the colorFabb PLA, ordered as part of the group buy here, vs. the light gray Amazon Basics PLA (next to a retro-brighted SE/30 case). The lighter color is the...

Not yet. I've got it pulled apart for a thorough cleaning and retro-bright. Still need to do a full restoration of the floppy. Once I have it all nice and pretty, I'll try to run an extended test. I also have a Mac SE with a MicroMac (or similar) 25MHz 68030 upgrade board. That one I've...

Also, here’s a few pictures of the Total Systems Gemini II 20Mhz accelerator board on the Plus logic board, for anyone curious. Later, I’ll also take a few photos of the correct pins for the IC hooks that attach to the analog board.

Additional update, and a lesson. I hadn't actually gotten around to inspecting the underside of the analog board, but probably should have started there. Sure enough, there were a few cracked solder joints. That may also explain why I thought the analog board had tested good in my 512k...

Update: I must have gotten mixed up when I was switching CRTs, analog, and logic boards. It does appear my issue is with the analog board that cam with the plus. I was able to confirm with a good logic board that the symptom remained (startup chime with no image on the CRT). I removed the...