Recent content by ironborn65

@leonlas , I'm sorry, I can not tell

I have a decent SE/30 logic board, slightly affected by battery acid. After adding a couple of bodge wires, it works almost perfectly. I replaced the original RTC with a new ATTiny RTC module. I installed 4 × 4 MB SIMMs in Bank 0 (16 MB total). The machine boots in 32-bit mode using a BMOW...

thanks, can u pls provide the URL? I got this https://www.utsource.net/sch/CY7C128A-20VC.html Replacement Models If the CY7C128A-20VC is unavailable or obsolete, consider the following alternative models: CY7C128A-25VC CY7C128A-35VC

linking a thread about the same topic https://68kmla.org/bb/threads/iici-cache-card-failures.42501/

UTSource Digikey Mouser Conrad have none, are there any compatible non obsolete chips?

I'm adding another sad story here. I got 4 cache cards, that have been gently cleaned, recapped and cleaned and checked and cleaned ... One of them makes the chime of death, while the other three exhibit the same symptom as @Phipli. Yes, the central one has the VLSI with a couple of pins bent...

Hey, I’m insisting on this CRT. thanks @Byrd I added Dow Corning Dowsil 3140 / 3145 RTV silicone gel, and the flyback is no longer arcing, but the VSYNC is still missing—in the sense that there is only a well-defined horizontal line. When I first started, there was a short vertical image...

Updating the thread. I've replaced the C418 cap with one with the exact capacitance and a few more around the vertical sync, which showed a weak ESR and loss. Namely them all: C414, C526, C404, C523, C522, C512, C418, C519, C517, C921, C920, C519 Now it's fully working. Another device was...

I'm working on it: https://68kmla.org/bb/threads/recap-guide-12-rgb-monitor-m1296.36971/post-579523

I made this picture while recapping the same monitor. I hope it can be useful. The caps I found leakinf were the C521, C417, C418, C517 This is the table IDValue Notes C401 1uF 50V C404 25uF 220V C413 1uF 50V C414 100uf 50V C416 22uF...

I possibly caught an error in the list: cap C420 is not the electrolytic one, the correct ID is C404

I realised there are other options for "fixing" a CRT. There are solutions in AliExpress as well as open source projects (I was told about a guy showing his solution in an IT retro fair, but was not able to find it): *a new CRT driver board*. They all offer VGA input. e.g. link Adrian has a...

Shame on me — the brightness connector had come loose during disassembly. Now the image is back, but I still can’t set the brightness and contrast correctly: it’s either too dark, or, when I increase the brightness, diagonal stripes appear. From this, I can reasonably conclude that there is a...

mmm, not really, they were all brand new and from known factories ... this does not prove much, but, no, I did not test them. The ESP can be critical, but I thought I could improve the parts later if the image was not good enough, but this is ...bad!

I have a Macintosh 12" RGB M1296Z that was working properly until the image on the screen became slanted and compressed along the vertical axis. I disassembled the monitor and found three leaking capacitors in what I believe are in the VSync section. I was unable to find a replacement for the...