I'd agree - ESD or other transients probably cusing latchup.=20
You mentioned video conferencing - maybe plugging in a camera or monitor =
whilst powered?

=20
On Wed, 8 Jan 2003 17:08:16 -0200, you wrote:

>Hi,
>
>> It seems reasonable that the power supply that this customer is using =
is
>> occasionally doing something that our board finds disagreeable, but =
what?
>> And why only when first assembled and never in the field? It would be
>> extremely helpful if we had some idea what to ask this customer to
>> investigate...
>
>    The power supply is a suspect but it is hard to imagine a glitch =
that
>causes problems on any of the 3 supply line that you are using and =
usually
>it would cause problems with the motherboard also !
>
>    I would look for possible ESD induced failures, either in =
manufacturing,
>transportation or at the client installation procedure. It would cause =
CMOS
>latchtup and then burn the chip to death.. To me this seems to be the =
most
>probable cause of failure.
>
>Best regards,
>Alexandre Guimaraes

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