Recent content by ACGuy

So, finally some good news! The Mac has sound again, and the "delayed RESET" issue has also been solved. See that R5 resistor between pin 12 and 13 (the 560k one)? Well, on my machine that resistor seems to have gone bad, it measured like an open circuit. Sure enough, I got a new one...

Okay, updates on this one. I desoldered the old chip, and replaced it with a socket. Like this, I made some measurements, after manually pulling the reset line high, so the computer can boot normally: this shows that the output (pin 10) of the sound chip is low all the time (so there's no short...

Hi again, I've kept looking at this, and now, instead of a perfect checkerboard, it gets a bit scrambled up: Still, the computer ends up booting normally, and it's fully usable. All RAM seems to be detected, and I've run Apple Personal Diagnostics 1.1.1 RAM tests (both long and short tests)...

Hi Kai, I gathered the necessary courage to remove the sticks 😅 Still, no luck, each pair seems fine on its own, the Mac reporting 2 MB when testing each pair on their own, and 4 MB when testing the complete set. So RAM seems fine. A RAM issue seemed weird to me as, I stated, the computer boots...

Hi Kai, I have 4 MB installed, and my logic board is the one with the jumpers. I haven't touched them, but I can try reseating the RAM sticks, but I'm a bit scared the slots may break (they are the full plastic ones). Still, I'm confused as I can see the reset line being held low for the 10...

Hello, this is my first post here after years of lurking around. I ended up registering because I’d need some help with my Macintosh SE. Sorry if this post doesn't belong here. After not using it since January, I started playing around with it the other day, and suddenly, when using it, it made...