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September 1999

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Subject:
From:
"Stephen R. Gregory" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 10 Sep 1999 15:45:54 EDT
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Hi ya'll!

Hoo-boy! We be getting some weather today! They said that remnants of
hurricane "Greg" would be going through our area this weekend, and it's
comin' down like cats and dawgs now!

Anyway, we just an assembly back from one of our customers that has a short
internally in the fab, from a power connection on a terminal block that's
installed into it, to the ground plane of the fab. It's a board that handles
some high power. They said that the board powered-up fine, but over time the
short developed. They also said that they suspect that another place will
develop a similar short from some readings that they were getting when they
began to trouble-shoot the first short. There's 4, 6-pin terminal blocks on
this board.

They sent us back the board and suggested that we give the assembly back to
the fab vendor to look at it and find out what the problem is. There are
those here of the opinion here that we should find a third-party somewhere
and let them take a look at the problem, because they will be more objective
in the diagnosis...if you catch my drift. Problem is, I don't know where I
should start to look for somebody like that, do any of you have any
recommendations?

I'll admit that I don't know much about what can cause something like that.
First thing that came to my mind, was some sort of electromigration happening
internally to the fab...since it happened over time (I don't know the actual
time frame), could that be it? Could it be caused somehow by the way we
assembled it?

Thanks for any suggestions!

-Steve Gregory-

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