they often do work for awhile, but of course they put a terrible strain
on the rest of the circuitry, the heat comes from a higher ripple
current, because the capacitor acts like a smaller and smaller cap and
hence doesn't hold as much charge and needs more than normal on every
charge cycle of the switching supply.  it is of course normal for some
of the top/end to show, but there should be some band around the edges. 
usually it's pretty consistent for a given brand/color of cap so others
in the same unit are a good gauge for any given brand.  i too have seen
some that were terribly, terribly obvious, but hadn't destroyed anything
else yet.

Hardy Menagh wrote:
> 
> On Mon, Sep 9, 2002, 7:06am (EDT-2), [EMAIL PROTECTED]
> (Philip�Stortz) wrote:
------------
> electrolytic caps have a nice feature by accident, the markings are on a
> plastic band that's a type of heat shrink tubing, when electrolytics in
> power supplies start to go they usually wind up running hotter and the
> band will shrink more.
> 
> ----
> I have a nice example of this from a PC PS. About 1/2" of aluminum is
> showing around the top of a 100 mfd cap. This supply was still working
> when I dismantled it. From a 286, if I remember right.
-----------

-- 
"Promise me, promise me this day, promise me now..." he asked.  "Even as
they strike you down, you will remember: humanity is not our enemy.  The
only thing worthy of you is compassion...Hatred will never let you face
the beast in human beings.  One day, when you face the beast alone, with
your courage intact, your eyes kind...out of your smile will bloom a
flower.  and...on the long, rough road, the sun and the moon will
continue to shine."  Thich Nhat Hanh, Buddhist monk

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