Macintosh Plus 1MB repair

Introdution

Recently we have received a vintage Macintosh Plus 1MB for repair from our French customer.

This beautiful fellow was born in 1986, but it looks externally almost like new – it was well looked after all the time. Unfortunately, it has suddenly stopped working last time – no power, blank screen, no chime, no single sign of life.

Step 1 – Diagnostics

We made every effort to get this lovely thing back to life, because it would be a huge loss when dispose it as a waste. We have started with a full visual inspection to determine whether there are any visible signs of fault (burnt components, swollen capacitors, blown fuse) but found nothing interesting at components side. Also, all the main voltages were good. But further inspection on soldering side of the analog board revealed a potential problem – solder damage on analog-to-logic connector, which is a so-called “cold solder”.

Step 2 – Repair process

We have removed the old solder, cleaned connector pins and PCB and applied a new solder onto it. Below you can see the results:

Step 3 – Tests

After repair we have assembled everything back and connected the computer into the mains. Hooray! It came back to life!

Summary

The only things left to do are to re-align the size, placement and geometry of the picture, set the proper focus voltage and remove every single particle of dust from the interior. All these to prevent from further faults.

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