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Today, while repairing an analog board for a Macintosh Plus, I stumbled upon a phenomenon: when the 12V is overloaded, the 5V voltage rapidly increases until it burns out the logic board. This phenomenon was reproduced on this Mac. My analysis of the possible causes is as follows: The negative...

I encountered a difficult problem:eek:too bad.My MacPlus flyback transformer is broken. The image is compressed horizontally, and the horizontal output tube current is huge. I've concluded that the coil turns are short-circuited. I've searched many forums and they all suggest replacing the...

Hi everyone, thanks for this forum. I have a Macintosh Plus, the analog board (international version, works in 120V mode) is broken, I repaired it, and now I can see the floppy disk symbol when I boot it. The current problem is that the screen brightness is too high when cold start, and returns...