Good Evening All!

Well, I now know as much about the raised vias on a board for an a assembly
that we built as I
could hope to know. A very professional and informative cross-section was
done on the fab that
contained blind vias that were used in SMT pads. The lab report was done by
a fellow Technetter
and his team that have asked to remain nameless.

If you recall, these vias looked like little "anthills" in the pads, and
there were many opinions offered
as to why these vias looked the way they do, from pre-preg resin flowing up
through the vias during
lamination, to not planarizing the fab after via fill. I think you will
find the report and cross-sections
informative and interesting.

Go to: http://www.stevezeva.homestead.com/files/Raised_Vias.doc

Thank-you "Mr. Nameless" and your team for your excellent work!

Kind regards,

-Steve Gregory-
Senior Process Engineer
LaBarge Incorporated
Tulsa, Oklahoma
(918) 459-2285
(918) 459-2350 FAX
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