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July 2009

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Subject:
From:
Vladimir Igoshev <[log in to unmask]>
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Date:
Mon, 6 Jul 2009 13:04:04 +0000
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Dave,



I bet it was etched as you can see the structure of Cu traces.



Regards,



Vladimir

SENTEC

SENTEC

11 Canadian Road, Unit 7.

Scarborough, ON M1R 5G1

Tel: (416) 899-1882

Fax: (905) 882-8812

www.sentec.ca





-----Original Message-----

From: "David D. Hillman" <[log in to unmask]>



Date:         Mon, 6 Jul 2009 07:39:03 

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

[log in to unmask]









Gabriela <[log in to unmask]> 

Sent by: TechNet <[log in to unmask]>

07/04/2009 02:54 AM

Please respond to

TechNet E-Mail Forum <[log in to unmask]>; Please respond to

Gabriela <[log in to unmask]>





To

[log in to unmask]

cc



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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