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May 2014

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Subject:
From:
Bob Wettermann <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Bob Wettermann <[log in to unmask]>
Date:
Thu, 1 May 2014 09:07:56 -0500
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Curt:

When trying to diagnose a BGA issue (besides asking lots of process
questions to try to get to a potential root cause or generate a fishbone
diagram), the analytical testing we start with is:

1. Visual
2. Endoscope
3. X-Ray (need the right tool to see the ball/board and ball/interposer
interface, concentricty, etc)

Once we get through the above then typically the next steps are:

1. Dye and pry (see what the extent of the problem is)
2. X-Section (zeroing in on a location)

We can then move on to a multiple of follow up testing........

Hope this helps....

Bob Wettermann/BEST Inc


On Thu, May 1, 2014 at 8:55 AM, Pete <[log in to unmask]> wrote:

> Curt,
>
> As far as a test lab, I've had good success with Celestica in the past.
>
> As far as the testing you need, if you are doing FA on a BGA, X-ray is
> nice to see if you have a problem, Dye & Pry is nice to help understand the
> location and scope of the problem, but you really need cross section
> analysis (SEM/EDX) to analyze the failure mechanism.  Skipping the cross
> section will save you time now bust cost you much more time over the next
> month.
>
> Pete
>



--
Bob Wettermann
BEST Inc
[log in to unmask]
Cell: 847-767-5745


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