A silly question.
How are you soldering the capacitors? By hand or Pick and Place equipment?
Rigo
Sr. Quality Assurance Engineer
Workmanship Standards, Code 300
NASA, Goddard Space Flight Center
Greenbelt, MD 20771
Phone. (301) 286-6129
Fax. (301) 286-6576
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Eric Laroche
Sent: Tuesday, December 13, 2011 8:36 PM
To: [log in to unmask]
Subject: [TN] cracked capacitors
Hi all,
We've been witnessing some field failures related to cracked capacitors. We have seen it on different PCBA's, different panel configurations, different physical locations on boards even 3 different capacitor suppliers. The only constant is that we always see it on the 0,1uF ceramic 0603. We've only had a couple of cross sections done as they are relatively expensive. All cross sections done so far show evidence of board flexing causing 45degree cracks.
There must be something along our process that causes this flexing. The way I see it, pretty much every step can be the guilty one. From PnP, reflow, repair, ICT, functional testing, depanelling and final mechanical assembly...up to some extent, they could all possibly be causing flexing and damage to capacitors. I would like to make a more extensive study to isolate the source of our problems. Are there other methods, less expensive than cross sectioning, to see if a capacitor is cracked?
Have any of you faced this problem in the past? What methods did you use to isolate the source of the problem? What were your results?
Thanks for your help,
Eric
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