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September 2012

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Subject:
From:
Dwight Mattix <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Dwight Mattix <[log in to unmask]>
Date:
Fri, 14 Sep 2012 14:45:44 -0700
Content-Type:
text/plain
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text/plain (99 lines)
It varies by brand and part number.

At 02:01 PM 9/14/2012, Robert Kondner wrote:
>Hi,
>
>  Does anyone know about the TCE of via plug material? I am trying to get a
>material number of what was used. This was the first board we ever ran with
>via plugging but I would think that is a well-known process?
>
>Bob K.
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Jason Zhao
>Sent: Friday, September 14, 2012 12:52 PM
>To: [log in to unmask]
>Subject: Re: [TN] Broken Vias
>
>Bob,
>
>Xsection will show you where the opens occur. Possibilities are: copper
>plating folds; thin copper; corner crack; post separation; separation due to
>no wraparound; etc. Then we can determine the root causes from there (there
>are too many to guess now). Looking forward to some pictures.
>
>Best Regards
>
>Jason Zhao
>VP of North America Operations
>Sunshine Circuits
>3400 Silverstone Drive, Suite 139, Plano, TX 75023 US Cell 510-468-4412,
>China Cell 131-62722392 www.sunshinepcbgroup.com
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Kondner
>Sent: Friday, September 14, 2012 10:18 AM
>To: [log in to unmask]
>Subject: [TN] Broken Vias
>
>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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