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Recapping a blown motherboard for Terry

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Old 03-05-13, 07:21 PM Thread Starter   #1
Super Nade
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Recapping a blown motherboard for Terry


Terry sent over three motherboards that had blown caps and needed fixing. These boards came with good stock caps, i.e Chemicon, Sanyo, Rubycon and Nichion. However, nothing lasts forever and the CPU VRM caps blew out. So far, I've repalced the 4V VRM caps with a bunch of OSCONs I've had (If anybody wants some free Sanyo Caps, send me a pm).

Some pictures of the work thus far. The missing cap between the replacements is a 6.3V 820uF, which I don't have on hand. Waiting for digikey to ship out the necessary caps.
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Old 03-05-13, 07:36 PM   #2
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Nice, I've only done dual layered boards so far and some power supplies. Triple layer and higher boards are much harder to repair. I've noticed it's always the capacitors near a heat source (CPU, fets, etc) that seem to pop first.

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Old 03-05-13, 07:59 PM Thread Starter   #3
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The trick with multi-layer PCB's is to make liberal use of flux. Check the link in my sig for details.
Caps near high current devices are the ones prone to failure, so as you said, CPU VRM, DIMM, PCIE and 12V power input areas are the ones to watch out for. I'll be replacing pretty much all the caps on the board.

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Old 03-05-13, 08:08 PM   #4
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Flux helps all the things! It really does.
Very clean desoldering, looks like you have significant practice with this!
I'm surprised the polymers had issues, that's a pretty solid bank of 'em. I suppose two phase CPU power isn't helping, especially if that's a prescott in there.

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Old 03-05-13, 08:20 PM Thread Starter   #5
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The polymers are the ones I put in. I forgot to take pics of the blown Chemicon's and the Nichion. As for practice, yes I've had loads of practice with soldering/desoldering electronics, part of the game when you are an experimental physicist (electronics plays an integral role in our work).

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Old 03-07-13, 03:09 AM   #6
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Super interesting. Please post more pictures as the work progresses!

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Old 03-07-13, 06:16 PM   #7
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Quote:
Originally Posted by Super Nade View Post
The polymers are the ones I put in. I forgot to take pics of the blown Chemicon's and the Nichion. As for practice, yes I've had loads of practice with soldering/desoldering electronics, part of the game when you are an experimental physicist (electronics plays an integral role in our work).


Nade,

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Old 03-07-13, 09:15 PM Thread Starter   #8
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I wish you had said Sheldon Glashow instead.

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Old 03-07-13, 10:27 PM   #9
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Quote:
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I wish you had said Sheldon Glashow instead.
Agreed, but the reference stands .

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