They were etched and polished again
Gaby

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman
Sent: Monday, July 06, 2009 3:39 PM
To: [log in to unmask]
Subject: Re: [TN] Weird solder joints

Hi Gaby - are the cross-section pictures in a etched or unetched status?

Dave Hillman
Rockwell Collins
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Gabriela <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
07/04/2009 02:54 AM
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TechNet E-Mail Forum <[log in to unmask]>; Please respond to
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Subject
[TN] Weird solder joints






Dear all,
By cross sectioning BGA solder joints on a failed assembly, I found that 
the
suspected joints are not uniform and that they contain unusual separation
areas.

I suspect mixed assembly and/or bad reflow profile.

Steve was so kind and enabled me to send the links.
Please may I have your opinion?
http://stevezeva.homestead.com/files/small.jpg

 

 <http://stevezeva.homestead.com/files/small1.jpg>
http://stevezeva.homestead.com/files/small1.jpg

 

 <http://stevezeva.homestead.com/files/small2.jpg>
http://stevezeva.homestead.com/files/small2.jpg

http://stevezeva.homestead.com/files/small3.jpg

 <http://stevezeva.homestead.com/files/small4.jpg>
http://stevezeva.homestead.com/files/small4.jpg

 


Gaby


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