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  1. M

    Macintosh 128k keeps restarting

    What's the best replacement for the optoisolator as I have looked around and replacement part numbers can differ.
  2. M

    Macintosh 128k keeps restarting

    I do have an old flyback transformer on a blown up 120v 128k analogue board that was given to me by a mate but the analogue board that is in my 128k is a 1986 240v replacement one as I think the original must have fried out and had to be changed out.  Its just a matter of weather a flyback from...
  3. M

    Macintosh 128k keeps restarting

    Thanks I also just turned it on with the lights off and the flyback has cracked as I can see the blue arc I have seen people use electronic silicone to repair the cracks on flybacks does this actually work properly.
  4. M

    Macintosh 128k keeps restarting

    Hello everyone I have a Macintosh 128k with a 240v analogue board that keeps restarting after running it for about 10 minutes but it mainly does it when the speaker is in use like when playing a game or something. I think it has something to do with the flyback as a failed one can cause speaker...
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