I recommend to make cross section of the broken vias, it will tell us lot
of information about the failure.
"One picture worth more than 1000 words"...
Reuven

On Wed, Sep 19, 2012 at 10:29 PM, Amol Kane (Asteelflash,US) <
[log in to unmask]> wrote:

> Were the boards moisture baked before assembly? .....is the stackup
> balanced? Is the via damage more pronounced in the area of warpage?
>
>
> Amol Kane
> Process Engineer
> AsteelFlash US East Corp
> Tel:   (607) 687.7669 x349 (O)
> www.asteelflash.com
>
>
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> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Kondner
> Sent: Friday, September 14, 2012 5:02 PM
> To: [log in to unmask]
> Subject: Re: [TN] Broken Vias
>
> 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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-- 

Best Regards,

*Reuven Rokah*

Mobile: 972-52-6012018
Tel:        972-3-9360688
Fax:          076-5100674
 <http://www.rokah-technologies.com/>[log in to unmask]
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