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] ______________________________________________________________________