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The fuse on the analog board is broken, this must be part of the problem...

Yes, everything reading zero (to measure the voltage I used a voltmeter to measure the voltage between the different holes, is that what was expected?) And, no, the Mac don't make any beep when it turns on.

I redid all the soldering that you framed but unfortunately this does not change the result

Thank you for this answer, there is no tension in this floppy port when the machine is switched on.

Hello everyone! 👋 I'm in the process of refurbishing a 1988 Mac plus. For the moment, when I turn it on, it's a black screen. I took it apart, the analog board seems to be a problem. Indeed, a part of the board is corroded. Below are some pictures from different angles: If you are...