Yepp, that's probably what we have to do. The solder paste is within the
requirements, so is the cleaning process. All other components on the board
are perfectly clean, and without even slightest sign of white crystals. Only
CBGAs, as I have pointed out. Maybe the bigger-than-the others CBGAs do not
reach correct maximum temperature, because of bigger mass? I don't know what
more to consider. It's somewhat of a mystery.
Inge
----- Original Message -----
From: "Reuven ROKAH" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Sunday, September 03, 2006 8:48 AM
Subject: Re: [TN] PbCO3
> My recommendation is to remove the BGAs, clean carefully the area and the
> pads surface and solder again new BGAs with new type of solder paste.
>
> I suggest to investigate the solder paste, expiration date and the
> cleaning
> solvent / cleaning process if exist such process.
>
>
> e mail: [log in to unmask]
>
>
>
> Hfjord
> <[log in to unmask]
> IPNET.SE> To
> Sent by: TechNet [log in to unmask]
> <[log in to unmask]> cc
>
> Subject
> 02/09/2006 20:59 Re: [TN] PbCO3
>
>
> Please respond to
> TechNet E-Mail
> Forum
> <[log in to unmask]>
> ; Please respond
> to
> Hfjord
> <[log in to unmask]
> IPNET.SE>
>
>
>
>
>
>
> Afternoon Saterday working people,
>
> I told Steve that I had some problem with the microscope. Now, I have the
> correct picture and has sent it to Steve for replacement. So, BGA SEMc
> image
> shows the correct PbCO3 content.
>
> Inge
>
>
>
> ----- Original Message -----
> From: "Steve Gregory" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Friday, September 01, 2006 3:16 PM
> 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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