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Yeah, I’m doing a test cleaning on one now to see how the results look. It was still pretty splotchy after a good 15 minutes of scrubbing and rubbing with a magic eraser. It’s in the UV light box now getting an extra long retrobright session. I’ll post the before and after photos shortly. I...

I was thinking the same when I was going through my exploded batteries and the intact ones. All the horrific ones were Maxells. However, as I was thinking I have never found a Tadiran battery leaking, I did come across one that appears to have started leaking. However, given the state of...

Started trying to chip away a bit tonight. The PSU in the IIfx but the logic board seemed pretty good. Here’s the before and after.

Oh, and here is the total list of things I picked up: Computer Qty Notes Starmax 4000/160 1 No case in the middle Mac SE 4 One booted into MacOS from HD Mac Plus 2 Quadra 800 1 Battery bombed Quadra 840av 1 Battery bombed Mac IIci / IIcx 4 Quadra 650 / Centris...

I'll post more in a bit, but I responded to a FB Marketplace post where the OP claimed "Around 100 computers, printers, scanners, and keyboards". No price, and the pictures showed some pretty dusty machines stacked on some shelving in what looked to be a shed. I looked at the posting's...

Yeah, I'll need 4. Usually the minimum for PCBs is 5, so that would likely save me a bit of money, and then I would have several functional DOS compatible 6100s to let the community have (I recently picked up a large number of machines, and I don't want to make a profit, but would love to get...

So, like I suspect many others, I picked up a Monitor /// recently (two actually, but only one had this issue) that had a tear on the mesh screen that I believe was to be a sort of anti-gear coating. When I removed the case, I realized it was just mesh attached to a plastic frame. I...

Any update on this? I just picked up a massive lot of machines and there are 4 6xxx machines with DOS compatibility cards. No cables. This could come in handy for the future owners.

So, I got a replacement video controller ROM from JCM and no change in behavior. This may be beyond my equipment and skill to continue troubleshooting. I've not replaced nearly everything in the video schematics diagram. I suspect maybe the video I/O is working well, but the instructions on...

Sorry, yes. many times on old caps it is MF (vs mF) which would be mega. Sometimes you would see UF instead of uF or µF.

Pretty sure that is just how some manufacturers printed microfarad when they couldn't produce the µ character on their caps. It certainly is not megaFarads

One other thing I found. I replaced the most of the ICs in the video schematics and god no change. However, I noticed on mine that the chip at H8 was labeled on the PCB as an LS04, but the schematic and the chip in my machine was an LS14. I replaced it with an LS14, but was wondering what...

Yeah. I used ADTPro on my Apple IIc+ with a Disk II attached. I wasn't sure if it was worked, but figured it was worth a try. Seems to work fine - I created the SOS ADTPro disk, as well as the Apple III Diagnostics disk and an Apple III confidence disk. Given the messed up video output...

So I used ADTPro to make an Apple /// Diagnostics disk. When it started up, I hit enter (I assume it's the first option to run the tests?). And I get this screen: So even when not in text mode, the image is not being draw correctly. It seems as though the image is broken up into parts...

I think I've read others have been replacing the header with something with higher quality ones? And in one video (), they simply tinned the headers to try to prevent future oxidation, which may be the cause of the buzzing. But I don't think the caps are the source. However, I'd replace the...

Minor update. I found some people saying their PB5xx machines run fine on 12v, and I've had the buck and boost converters getting very hot during longer use, and so I decided to see if I can just use the standard voltages supported by USB-C for the two higher ones (15v for 16v, and 20v for...

I think the challenge is that the internal battery contacts, I don’t believe, are simply able to supply voltage. I think there’s an expectation of the battery management doing things and communicating with the laptops. And, as you noted you’d have to disable the power input so you’re not...

OK, so 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 tell it is booting SOS and launching ADTPro. I can interact with the app with the arrows and it is beeping at me, so I'm...

It seems like Joe's Computer Museum is trying to specialize in the III. I ordered a cap kit, but I'm wondering if I should have added a video ROM to my order in case that is the source of my video problems.

OK, so I decided the RIFA caps are probably not in good shape to continue using. I removed them and tested and the .22uF one appears to be shot. Would that cause issue with the PSU voltage that could cause problems with the video output. I suspect the square in the bottom right that is...