On Sat, 28 Jul 2012 13:49:19 +0100, Mike Tomlinson
wrote:

En el artículo , Tom Del Rosso
escribió:

That means the PSU caps are overwhelmed and might
suffer some damage too.

Yes. All motherboards I've seen with failed caps in the processor
voltage regulator cct have also had failing caps in the PSU.

That's not what I've been seeing. I don't do too much recapping, but
replacing the MB caps usually solves the problem. I have seen bad
power supplies, but MB cap failures seem more common. One common
characteristic I see in failing ATX power supplies is that they tend
to have only a few physically small capacitors in the DC output filter
section. The ATX supplies that are crammed full of big electrolytics
seem to survive nicely.

Replacing the PSU as well as recapping the board is what makes repair
uneconomic.

Ummm... it's easier to recap a power supply than a mother board. The
PS comes out easily, is easily disassembled, usually has a single
sided low density PCB, and is easy to test after recapping. The MB
requires removing lots of hardware, replacing many more small caps, is
a multi-layer PCB, and takes more time to test.

What makes MB recapping uneconomical is that rather large number of
caps that usually need replacement. Testing the caps on the MB is
problematic because many are in parallel. The only sure way is to
replace anything that might fail. That's usually about 12-15 caps on
a typical MB. I can frequently buy a used MB on eBay for less than
what I charge for my time. I still do recapping because I detest
creating eWaste, but I don't make much money on recapping.



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Jeff Liebermann
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Santa Cruz CA 95060 http://802.11junk.com
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