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Hi and happy new year /o/ So I had this LC III motherboard sitting alone for a while, death chime, original caps. But beside that seems in great condition. I did a recap and indeed after cleaning, the motherboard looks fine, almost like new. Great! Recapping done nicely, no surprises...

I've got some schematics, unless I'm wrong this is not the case on the IIsi. But I missing a page just near the part with the 2 Sony chips. I'm definitely going to check this first, I repaired a LCII with the same behaviour due to a bad ground connection on a chip managing the reset line. I...

Here is a small update, The leak as done a nasty job, the corrosion is quite heavy. Before doing a first test after recap, I was pretty sure it ain't be successful, alas, this IIsi didn't prove more wrong. Using an ATX PSU and matching the power connector pinout, I was able to start the...

Hello there :) With lockdown I decided it's time to dig into some long post-phoned repairs, start with the mighty and wicked fast the "LC" look-alike Macintosh IIsi! I bought it on ebay for a fair price, it was out of order of course, but it was, electronics aside, in a good condition. This...

Unfortunately it’s not an adapter problem, I used one to force the video mode at boot, and the one I use works fine with others LCs. I can’t get my Apple Display to show you a picture of what is displayed. But you can definitely see the happy mac then the desktop, but the video is totally...

Hello LCs enthusiasts! I recently get one of my LC475 unit out of storage in order to fix it and sell it. (Need to make some space :( ) Unfortunately, despite everything seems fine, the video output is missing HSync. PRAM battery is good I used a VGA adapter with DIP switches to force...

I've planned to take some high-res pictures of my board this week-end. Yes, last paragraph of the "Prodigy RAM modules" section. Note that PALs and gate-array are OTP (one-time programming) so if it's mandatory to upgrade them we'll need new-old stock or replacement, and of course the actual...

Hello! I recently got a Levco upgraded SE and decided to dig into it. I've done some digging into the board ROM and found few things. For exemple you can start the on-board self-test with the interrupt button and the following command: G 600056 But will focus on the RAM upgrade since it's...