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June 2010

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Subject:
From:
"Whittaker, Dewey (EHCOE)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Whittaker, Dewey (EHCOE)
Date:
Mon, 14 Jun 2010 08:48:39 -0700
Content-Type:
text/plain
Parts/Attachments:
text/plain (230 lines)
Not in regulation. Not even in moderation.
Dewey

-----Original Message-----
From: Inge [mailto:[log in to unmask]] 
Sent: Friday, June 11, 2010 1:01 PM
To: Whittaker, Dewey (EHCOE); [log in to unmask]
Subject: Re: [TN] Weird formation of voids

Graham Greene?

Inge

--------------------------------------------------
From: "Whittaker, Dewey (EHCOE)" <[log in to unmask]>
Sent: den 11 June 2010 21:40
To: <[log in to unmask]>
Subject: Re: [TN] Weird formation of voids

> A wise comment was obviously addressed to me, but the SiC in the rough
> is most definitely a reference to Graham at the GOLF course.
>
> Dewey
>
>
>
> ________________________________
>
> From: [log in to unmask] [mailto:[log in to unmask]]
> Sent: Friday, June 11, 2010 12:06 PM
> To: TechNet E-Mail Forum; Whittaker, Dewey (EHCOE)
> Subject: Re: [TN] Weird formation of voids
>
>
>
>
> A wise comment from a SiC in the rough..................
>
> Doug Pauls
>
>
>
> "Whittaker, Dewey (EHCOE)" <[log in to unmask]>
> Sent by: TechNet <[log in to unmask]>
>
> 06/11/2010 01:52 PM
>
> Please respond to
> TechNet E-Mail Forum <[log in to unmask]>; Please respond to
> "Whittaker, Dewey (EHCOE)" <[log in to unmask]>
>
> To
>
> [log in to unmask]
>
> cc
>
>
>
> Subject
>
> Re: [TN] Weird formation of voids
>
>
>
>
>
>
>
>
>
>
> It's always good to get a view from a cross-section of our Industry,
> regardless of how well polished it was or not.
> Dewey
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of stephen gregory
> Sent: Friday, June 11, 2010 8:21 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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