Macintosh SE sudden death: burned chip on logic board + suspected analog board capacitor leakage

[victor.muc]

Kind of OT, but what system versions do you have? If both of your machines are running System 6 or less, there's no way for you to host files on either unless you have dedicated server software. System 7 and up had built-in file hosting.

Both machines are running System 7, the Macintosh SE as well as the PowerBook I was trying to connect to. So file sharing should have been available on both sides.

 

[Phipli]

Thanks, I’ll try that!

I’m admittedly cautious around high voltage hardware, so I’ll take things step by step. The logic board measurements are no problem, but for anything involving the analog board or PSU, I’ll proceed carefully or hand it off to someone more experienced.

If the PSU fuse has indeed blown as suggested, that would explain the symptoms quite well, and I’ll have it checked and replaced once the underlying fault on the logic board has been addressed.

Generally if I'm going near the PSU or analogue board, I don't rush. I unplug the computer, toggle the power switch and then leave it for at least a day. But yes, take care, they can pack a punch. Also, take super care around the tube - they're very easy to break if you knock the neck board. Especially as you pull out cables from the logic board. There is always something else to be fixing

 

[victor.muc]

Generally if I'm going near the PSU or analogue board, I don't rush. I unplug the computer, toggle the power switch and then leave it for at least a day. But yes, take care, they can pack a punch. Also, take super care around the tube - they're very easy to break if you knock the neck oard. Especially as you pull out cables from the logic board. There is always something else to be fixing

I’m doing the same. When I fixed the floppy drive, the machine was completely unplugged for about a month while I was waiting for replacement gears, which gave me some peace of mind. It’s now been powered off for more than two weeks, so I know it should be safe, but I’m still a bit nervous

What makes me most uneasy is having to remove the anode cap when going further with the analog board and PSU.

And the glass tube already gave me a few heartrate spikes while unplugging the logic board power connector since that thing sits really tight.

 

[Phipli]

And the glass tube already gave me a few heartrate spikes while unplugging the logic board power connector since that thing sits really tight.

Just make sure you press the latch, and then rock it from side to side until it works loose, rather than pulling on it. Which I'm sure you've figured but worth saying just in case.

 

[victor.muc]

Just make sure you press the latch, and then rock it from side to side until it works loose, rather than pulling on it. Which I'm sure you've figured but worth saying just in case.

Yes, the first time I disassembled it, I spent a good 30 minutes fighting with that connector before realizing it actually has a latch