Battery damage before and after \ VOGONS

Battery damage before and after

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First post, by eesz34

Posted on 2022-02-21, 21:23

eesz34 Offline

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Stupid batteries. Who decided it was ok to put NiCd batteries on motherboards?

Anyway I spent a few hours on this. I got it like this and the board seems to work now with an external battery. It's not pretty, but it's solid and there aren't many options when the traces are eaten away. New headers and the four resistors.

Reply 1 of 4, by Shreddoc

Posted on 2022-02-21, 22:11

Shreddoc Offline

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What an excellent job, well done.

Just look at the copper oxides (or whatever) packed into the holes of that pin jumper, in the Before image! Such corrosion.

Reply 2 of 4, by eesz34

Posted on 2022-02-21, 22:51

eesz34 Offline

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Location: MN, USA

Shreddoc wrote on 2022-02-21, 22:11:

Just look at the copper oxides (or whatever) packed into the holes of that pin jumper, in the Before image! Such corrosion.

Oh yeah, I assume that was a very slow process, how it crawled up the header pins. At least the battery is located in the absolute best part of the board for this to occur. No semiconductors damaged. And the FPU socket will likely not be used although it all looks ok.

And let me recommend water-soluble flux. I started using this over 10 years ago and absolutely love it. Rinse off under tap water and all flux residue washes away! So much better than the common RMA that won't budge without alcohol.

Reply 3 of 4, by Sphere478

Posted on 2022-02-22, 00:20

Sphere478 Offline

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Good job!

This would be a cool thread for all the restorations that others have done as well.

I’ve seen you guys do some amazing work salvaging some of those motherboards.

Sphere's PCB projects.
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Sphere’s socket 5/7 cpu collection.
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SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod
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Tyan S1564S to S1564D single to dual processor conversion (also s1563 and s1562)

Reply 4 of 4, by Horun

Posted on 2022-02-22, 01:34

Horun Offline

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Good work !

Hate posting a reply and then have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. Stuff: https://archive.org/details/@horun

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