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Thanks! I'll inspect those chips closer - I didn't notice any trace damage, so maybe it's the chips themselves.

@MrFahrenheit , did you ever find out what was causing this? I have a Iici that was working fine until a few days ago when it started doing the same thing. Seems to be warm up related because it seems to be causing a short or something that triggers the PSU to shut off. Then it refuses to...

Yeah, I had seen that. Looking to do something a little more polished. I have a large number of 6100s that I'm trying to fix up to sell for cheap to other vintage Mac people in my area, and want to avoid them having something fragile or having to buy an expensive adapter. The DB-15 to HD-15...

If you can find any details, I've looked all over trying to find options and I'd love it if someone else has tackled this problem already.

Actually, I was originally thinking to create an external adapter, but doing some sort of PCB to to convert the existing connector to a standard DB-15 might be a better approach. Especially if you could fit it in the case opening where the HDI-45 went. I may start looking into it, although...

I have a bunch of 6100s I picked up recently with no adapters. Was trying to mock up a PCB, but my board design skills are lacking. Would love to pair a simple PCB with a cable such as this (https://www.amazon.com/gp/product/B0CHNN9J96/ref=sw_img_1?smid=A29TUTMZHZRSW7&th=1) to make an adapter...

FYI, these 3d printed connectors work fantastic. I used them in combination with another project on TinkerDifferent to house a USB-C trigger board and buck or boost converter. I had some problems with the buck / boost boards overheating, and the standard 15v you can get out of a USB-C trigger...

I tested to the legs to make sure there wasn't a socket issue. I'll keep digging in and maybe look into what it would take to get an oscilloscope. If nothing else, this is a good challenge. :)

Playing around with it a bit more to see if I can get a better understanding of the issue(s). Looks like it's more than just the characters being messed up. I ran the Diagnostics disk and hit enter on the first option (run all tests?). I get this screen: So it looks like the pucture is...

Sadly, no oscilloscope or any knowledge of how they work. I might need to do some more studying on some of the YouTubers to get an idea of what things to check for. I did check the traces from the video control ROM and they all checked out (except the two I could not find the destination for...

Interesting. I was thinking it was like the character ROM and the distorted symbols was a sign of that. But it wouldn't have explained the fact that the characters were in the wrong place on the screen. I'm hoping maybe something in the functionality of that video control ROM might be the...

Swapped the chips and the video output is exactly the same. I'll probably use the schematics to trace connections to and from those chips, along with what I thought was the Video ROM. Appreciate all the tips, everyone!

I thought it had one. What did I buy then? https://jcm-1.com/product/342-0032-apple-2332-video-rom-replacement/ Is there a difference between a video ROM and a video control ROM?

Yeah, that RAM board was a bear to get off. I will try to hit it with some DeOxit. Another update with some troubleshooting progress: I did confirm the III is booting. I was able to make an ADTPro SOS disk from my Apple IIc+ and booted the Apple III with it in the drive. And, I certainly can...

Appreciate the post. Yeah, unfortunately I got into computers with a Mac SE, so the Apple II is pretty foreign to me and the Apple III is even more of an odd beast. So I'm hoping to try to get it to boot something useful that might be able to confirm that it actually is booting. I have PCBs...

I went through the task of removing, cleaning the legs, applying DeOxit to the sockets, and re-installing every socket chip on the board, and unfortunately the end result is the same. I'm also beginning to think the video output is scrambled, but the machine may actually be booting and the...

I just picked up an Apple III locally and it came with a ProFile 5MB Drive (unfortunately no Profile card in the machine), two Apple /// Monitors, and the external floppy drive. I need to replace the RIFA caps as the big ones are cracked significantly. However, I decided to start it up in...

OK, I may solder that wire to ground then, unless anyone chimes in with a reason not to. Thanks for modeling this!

FYI, I printed a batch of these at JLCPCB in their black resin (I only have an FDM printer and I tried to print and it was not up to the task). Their black resin is a nice dark gray color - slightly darker than the 5xx series. They turned out great. I ended up switching from a cutting disk to...

Did you connect and reconnect the keyboard? Certain it is all the way seated in the connector? I'd also be concerned about the power cutting out when moving the screen. Sounds like a loose connection that may have come complete out during reassembly.