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April 2010

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Subject:
From:
Tan Geok Ang <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Tan Geok Ang <[log in to unmask]>
Date:
Thu, 22 Apr 2010 20:34:02 +0800
Content-Type:
text/plain
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text/plain (98 lines)
There is a face near to the right bottom side of 
http://stevezeva.homestead.com/files/BGA_SEM.jpg <https://webmail.dso.org.sg/exchweb/bin/redir.asp?URL=http://stevezeva.homestead.com/files/BGA_SEM.jpg> 



________________________________

From: TechNet on behalf of Steve Gregory
Sent: Thu 4/22/2010 5:29 AM
To: [log in to unmask]
Subject: Re: [TN] BGA balls dipped in sugar?



Hi Inge!

You sent me this picture some time ago, along with one of your beautiful SEM
images and the EDAX chart of it, remember?


http://stevezeva.homestead.com/files/bga002.jpg

http://stevezeva.homestead.com/files/BGA_SEM.jpg

http://stevezeva.homestead.com/files/BGA_EDAX.jpg

Steve


--------------------------------------------------
From: "Inge" <[log in to unmask]>
Sent: Wednesday, April 21, 2010 4:26 PM
To: <[log in to unmask]>
Subject: [TN] BGA balls dipped in sugar?

> Hi,
> at least it looks so.  It's ordinary lead tin soldering process. Analysis
> gave that what looked like sugar crystals probably was Lead Carbonate.
> How is that created? If someone got same, what did you do then?  You need
> extraordinary stuff to remove these crystals.
> Sent picture to Steve.
> /Inge
>
>
>
>
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