TECHNET Archives

September 2012

TechNet@IPC.ORG

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Subject:
From:
Robert Kondner <[log in to unmask]>
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Date:
Fri, 14 Sep 2012 11:18:12 -0400
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Hi,

 

A small company in the area has a board with two very expensive parts, about
$3K each part. They built 30 boards and had lots of open via connections.
They are getting cross sections now on some bad vias. In addition to many
bad vias there was some board warp. Sorry I don't have any hard numbers on
bad via counts or warp.

 

These were 10 mil holes in .062 material, a 6:1 aspect ratio, should be
easy. Vias were plugged and plated so they could be used as flying probe
test points. 

 

After reflow assembly the boards were run on a wave machine using a mask
where about 25% of the board was exposed to the wave. Everything lead free. 

 

Question:

 

Can folks suggest lists of items we can check, measure or inquire into? Any
guesses or ideas as what might be going on?

 

Thanks,

Bob K.



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