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July 2009

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Subject:
From:
Vladimir Igoshev <[log in to unmask]>
Reply To:
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]
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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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