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I'm updating my previous post, as I didn't have much time yesterday and wasn't fully aware of everything. Today I tried a "modern" PSU with an adapter. And the sound problem persists. When I power it on from cold, I have a chime and sound, but as it warms up, the sound gradually disappears...

Hi. I have some news :). Since I couldn't get it to work, I cleaned it with a product that has helped me revive old circuits many times, both in consoles and computers. I applied a little, spread it with a brush, and left it for a few days. Yesterday afternoon I connected the LCII, turned it...

Hello again. I've thoroughly cleaned the motherboard. It looks much better now, with no traces of acid. The PSU is supplying +5.2V, +12.3V, and -5.1V when connected to the motherboard and powered on. It's still the same, just a white screen and no chime. It won't boot. Could it be the...

1uF, like the original.

Okay, I'm going to do a thorough cleaning. I've already done a little, but it doesn't seem to be enough. As I mentioned in the first post, I've already recapped all the electrolytic capacitors, both on the PSU and the motherboard. That's why they're bent.

I am attaching photos that I was able to take yesterday. As for the PSU, I have tested both the repaired one and the one I use in a fully operational LC. With both, the result was the same.

I did another test. I was testing it with a dead battery (0.5V), and I tested it with a new battery (3.5V), and with both I get the same result, but if I remove the battery, I hear the chime of death. I put any battery back in and I don't hear it. The screen is always blank. Even removing the...

Hi. Many years ago, in a MacWorld magazine, there was a story about a guy who converted an old Macintosh into a PC case because it had been plugged into a 220V outlet, and it was an American 110V machine. In that conversion, he wanted to use 9-chip PC RAM, and I remember him saying that with...

Hi, I recently got an LCII that wouldn't boot. I recapped the power supply, and after that, the LCII powered on, but there was no chime, and the screen was just a blank image. After that, I recapped the motherboard (just the electrolytic capacitors), but nothing changed. I've tried changing the...

As a curiosity, if you try to turn on the Cube with the top plate unscrewed, where the button is, since it's not grounded to the chassis, when you press it, it interprets that you're holding it down, and it blinks because it interprets that you want to activate the firmware's program mode. This...

Very good contribution. I also had a processor height issue because it was too low, and I solved it by sandwiching a thin 0.5mm copper sheet between the heatsink and the processor with good thermal compound on each side. It works very well. And above all, it removes the adhesive aluminum sheets...

Hi, I initially wanted to do it with a preheater and a hot air soldering iron, but I didn't want to overheat the components I'd be keeping, so in the end I used a technique that might not be as professional, but one I've used many times to remove components. I set the soldering iron to about...

Hi everyone, I'm sure you're already familiar with this link, but it's a cheap and easy modification. https://forums.macrumors.com/threads/open-source-power-mac-g4-cube-vrm.2405896/ I did it on a Cube and it works very well. It's powering a Sonnet Encore ST 800 and a Radeon 7500. For European...

Hi, I found this forum thanks to @JDW. You've already provided many solutions, but I'll briefly share my experience. I have SSDs in all my G3 and G4 Macs, and I've used these adapters, all with JMicron. I've only had some incompatibility with the SATA or mSATA HDD used, but using another brand...