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October 2010

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Subject:
From:
"David D. Hillman" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Mon, 11 Oct 2010 13:22:11 -0500
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Hi Chris - do you have any pictures you can share?

Dave Hillman
Rockwell Collins
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Chris Mahanna <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
10/11/2010 11:29 AM
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TechNet E-Mail Forum <[log in to unmask]>; Please respond to
Chris Mahanna <[log in to unmask]>


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Subject
[TN] Mech. damage or poor wetting?






We have a BGA dye-n-pry job that shows board side sj damage with a strong 
correlation to fan-out clocking.
We also have some microsection evidence of poor wetting.
All damage/dye is on perimeters.

Is this an indication of heat sinking and subpar wetting, or can it be 
completely mechanical?  Both?

Thanks

Chris

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