Macintosh Classic revival - another battery damaged salvation

joshc

68LC040
I picked up a Classic for AU$120. Looked clean on the photos, rear ports didn't look rusted. It arrived. Battery has already wrecked it. Cool.

I immediately knew things were bad when I removed it from the packaging because I could hear rattling inside and what sounded like lots of bits of metal moving around. Things were definitely wrong when I removed one of the T15 screws on the back as it was rusted and a little hard to remove.

And sure enough...

After being somewhat rough with the rear bucket to remove it as it was so wedged closed by rust particles and presumably not opened in a long time...

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Whole side of the frame rusted, fan guard completely rusted too.

I couldn't actually get the logicboard out without quite a lot of force and jamming a flat head screwdriver in a few places to force it out as it was 'welded' in there with all the rust on the frame rail.

With the logicboard out, I could do my first assessment of the damage.

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Sure, it looks horrendous, but let's give it a chance...

And before we do that, let's look at the culprit of all this mess. Of course it's another red Maxell battery, dated 90-06.

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OK, time to see what we can do with this logicboard.

First thing is a vinegar bath and a scrub with a toothbrush to address all the battery corrosion sitting on top of the board.

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After a few minutes and a scrub:

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That alone has loosened and removed a lot of the mess!

Next up was a hot wash with washing up liquid and a scrub, and then a rinse.
Which got things to this state:

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A close up of the battery area after wash:

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Let's look at the other side:

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And a couple more close ups of the remaining damage to repair

RTC:

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Battery/CPU area:

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I am pretty confident that a repair of this board is worth persuing instead of immediately looking at other options.

I am mostly concerned about what's happened with inner layers, as things on the reverse don't look great.

I need to wait on supplies and some new equipment before I can start on the next stage, but thoughts and comments are welcome on what we can see so far.

Thanks for reading!
 
Can't wait to see it finished! It looked bad at first but with it cleaned it looks like it might actually be repairable! Have fun!
 
I don't want to add salt to the wound but that looks really bad. Have you even looked at the damage that the caps did to the analog board yet? The Mac Classic being prone to bad caps and exploding batteries, I would never buy one without cracking the case, showing everything inside. A Mac SE wouldn't have done all of this and it's the same specs.
 
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