Was this BGA reworked?
Victor,
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of stephen gregory
Sent: Friday, June 11, 2010 10:21 AM
To: [log in to unmask]
Subject: Re: [TN] Weird formation of voids
Hi Bev!
Got your picture today, and have it posted now:
http://stevezeva.homestead.com/Bevs_Ball.jpg
Almost looks like little pieces of dross. I wonder if something is going on with the solder paste? Or leaded reflow profile with a lead-free BGA?
Steve
--- On Wed, 6/9/10, Bev Christian <[log in to unmask]> wrote:
From: Bev Christian <[log in to unmask]>
Subject: [TN] Weird formation of voids
To: [log in to unmask]
Date: Wednesday, June 9, 2010, 9:51 AM
TechNetters,
I am sending a picture to Steve to post. I have labs in three locations. One of them has seen weird voids in cross-sections of BGAs while the other two locations have not. For the lab that has seen them, the cross-sections were prepared by different people on different days for different products, using the same equipment. The voids are not in all balls cross-sectioned but may be only in one of two of the balls in a row of multiple solder joints examined.
Have you seen anything like this? Do you know the root cause?
Vlad,
You know what is going on, so please don't respond.
Bev
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