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July 2009

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From:
Mike Fenner <[log in to unmask]>
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Date:
Sun, 5 Jul 2009 13:35:39 +0100
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HI Gaby
I really need a metallurgist to tell me what I think when looking at X
sections, but I think I see two conditions:
Small1, small2 are pretty homogenous, just look like a little too low too
shot TAL ,
Small Small3 small4 are not homogenous and show evidence of cracking/HIP
Probably are mixed alloy.
All pictures have stuff in them, whether this is a construct from section or
inclusions of flux etc I can't tell, but the big dark features which look
like cracks at first sight are probably not cracks, they are not "cracky
enough". Shrinks or blow holes I would guess.


Regards
 
 
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gabriela
Sent: 04 July 2009 08:54
To: [log in to unmask]
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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