Ramon,
As I said, all other components are perfectly soldered, and without
residues. It's just the CBGAs that show white crystal growth.
Inge
----- Original Message -----
From: "Dehoyos, Ramon" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, September 01, 2006 4:20 PM
Subject: Re: [TN] PbCO3
BGAs are the most difficult to clean, due to the fact that the
solder joints are under the part. It may also be that the flux was not
fully activated. Perhaps the combination of the two.
Just a thought
Ramon
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Friday, September 01, 2006 9:17 AM
To: [log in to unmask]
Subject: Re: [TN] PbCO3
Mornin' Inge and Everybody!
YAY IT'S FRIDAY! AND IT'S A 3-DAY WEEKEND TOO!!! WHOOO-HOO!!!
Got the pictures up...go check out:
http://stevezeva.homestead.com/files/bga001.jpg
http://stevezeva.homestead.com/files/bga002.jpg
http://stevezeva.homestead.com/files/bga004.jpg
http://stevezeva.homestead.com/files/bga005.jpg
http://stevezeva.homestead.com/files/BGA_SEM.jpg
http://stevezeva.homestead.com/files/BGA_EDAX.jpg
Pretty nice pictures Inge. I'm not knowledgeable at all of how to
interpret your pictures. Although there's something about your SEM
picture that catches my eye. I can't quite put my finger on it
though...something very strange about that image.
-Steve Gregory-
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ingemar Hernefjord
(KC/EMW)
Sent: Friday, September 01, 2006 2:40 AM
To: [log in to unmask]
Subject: Re: [TN] PbCO3
I have sent pictures on the residues to Steve. Unfortunately, I did not
have my ordinary microscope camera, will send better pics later.
Hmmm...Carbon Peak is too low for PbCO3..have to do FTIR..
You all give little pessimistic view of the situation. Maybe we had
better to replace the CBGAs with the residues...and hope there will be
no more.
The funny thing is that our factory in South Africa get such crystals
too, and they use different flux and different solder alloy.
Inge
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joe Fjelstad
Sent: den 1 september 2006 01:50
To: [log in to unmask]
Subject: Re: [TN] PbCO3
Hmmmm.... It seems that lead solders might have another environmental
benefit, that is as a CO2 sink to help stem global warming... ;-)
Joe
(One must keep their humor in the ongoing lead-free fiasco... :-)
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