Nah, I think we'll just have to agree to disagree.  I used to do IC failure analysis in a previous life; it doesn't take much to kill an energized chip.

But we digress; back to Gumstix and all that is wonderful about them, including the ease with which they can be replaced! ;-)

On 10/3/05, Frank < frannk_m1@yahoo.com> wrote:
Even if you get AC coupling, it won't be enough energy to damage
anything. I'll be you a gumstix board of your choice you cannot
fry a board with the esd material.
You guys are barking up the wrong tree...

--- Andrew Plumb <aplumb@gmail.com > wrote:

> Hi Frank,
>
> If you can guarantee that it wasn't the ESD bag, I'd like to
> see the AC/XF
> analysis you performed on the material. When you power up a
> Gumstix there's
> a LOT more than DC going on there. That 200MHz or 400MHz
> clocked digital
> activity acts more like analog/RF than near-DC steady-state
> digital; good
> old capacitive coupling (through the bag) lets the transients
> get
> everywhere.
>
> Remember also that that chip-pins and board-trace are a good
> deal closer
> than an inch. Place your probes 0.1" apart, parallel and
> length-wise (so the
> length of the probe is in contact with the bag, not just the
> tip), and
> measure the resistance. It still won't tell you how the
> material will behave
> w.r.t. AC signals (that frequency transfer function), but at
> least it'll be
> a more accurate DC model.
>
> Andrew.
>
>
> On 10/3/05, Frank <frannk_m1@yahoo.com> wrote:
> >
> > I cand guarantee you it wasn't the esd bag as they are
> called.
> > The resistance is almost immeasurable. If you don't belive
> me.
> > take an ohm meter, put the probes about an inch apart and
> > measure the resistance, It will approach infinity..
> >
> > --- "Michael M. Butler" <mmbutler@gmail.com> wrote:
> >
> > > Tom:
> > >
> > > There's a *faint hope* that the conductivity of the bags
> was
> > > low enough that
> > > no permanent damage has been done. Try removing the
> shipping
> > > bag plastic
> > > sheets, substitute paper as someone suggested, check that
> your
> > > connector
> > > mating is good and connect commo and power again.
> > >
> > > It *might* revive. But I'm not guaranteeing anything.
> > > Sometimes we pay
> > > tuition for our education... :\ :)
> > >
> > > Mike
> > >
> > > >
> > > > To make a long story short, you basically did the
> equivalent
> > > of shoving a
> > > > piece of aluminum foil between the boards and turned on
> the
> > > power. Not a
> > > > healthy thing to do to electronics.
> > > >
> > > > Good thing these boards are inexpensive, eh? ;-)
> > > >
> > > > Andrew.
> > > >
> > > > --
> > > >
> > > > If you don't know what to do, do something.
> > >
> > >
> > >
> > >
> > > --
> > > Michael M. Butler : m m b u t l e r ( a t ) g m a i l . c
> o m
> > > Churchill once said, "When you're going through hell, KEEP
> > > GOING".
> > >
> >
> >
> >
> > __________________________________
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> > http://mail.yahoo.com
> >
> >
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> >
>
>
>
> --
>
> If you don't know what to do, do something.
>




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If you don't know what to do, do something.