https://www.google.com/url?q=http://www.mate.tue.nl/~piet/dat/sol/pdf/rues03prA42.pdf&sa=U&ei=3YTiU6f0F4SBogSntoKwDA&ved=0CAcQFjAC&client=internal-uds-cse&usg=AFQjCNFbkjdTEN5nkbT9_QDYl41-DsAgGw


Ed Popielarski
Engineering Manager


                               970 NE 21st Ct.
                              Oak Harbor, Wa. 98277

                              Ph: 360-675-1322
                              Fx: 206-624-0695
                              Cl: 949-581-6601

       "It's one kind of victory to slay a beast, move a mountain, and cross a chasm, but it's another kind altogether to realize that the beast, the mountain, and the chasm were of your own design."
https://maps.google.com/maps/myplaces?hl=en&ll=48.315753,-122.643578&spn=0.011188,0.033023&ctz=420&t=m&z=16&iwloc=A


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Kondner
Sent: Wednesday, August 06, 2014 12:11 PM
To: [log in to unmask]
Subject: Re: [TN] SJ fracture signature

Newbie Question:

 Why do the images look like vanilla ice cream with cookie crumbs?  

 Why the very inconsistent mixture in the solder?  At first I thought it was just some coloring issue but the cracks seem to propagate along the interfaces.

I would think the solder would be a better amorphous mixture. Could that solder filled with dross?
 
Bob K.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Chris Mahanna
Sent: Wednesday, August 06, 2014 2:49 PM
To: [log in to unmask]
Subject: [TN] SJ fracture signature

We see hundreds of cracked solder joints every year, but I can't say that I've ever seen one quite like this.  I have some suspicions, but I'll keep them to myself, as to not prejudice the crowd.
EDS maps are forthcoming.

This is a caught in-the-wild field failure of a 48-pin BGA Reballed to SnPb ENIG on board side Ni barrier on component side

http://stevezeva.homestead.com/45268-1.JPG

http://stevezeva.homestead.com/45268-2.JPG

http://stevezeva.homestead.com/45268-8.JPG

Thoughts?  And Thanks to Steve!


Chris Mahanna
President, Technical Manager
Robisan Laboratory Inc.


______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________


______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________

______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________