I believe the flexing of the board in conjunction with the BGA package
outline may be the issue.  My profile is great, according to the mfg and our
process equipment, so I have ruled that out.  The BGA itself is not flat it
has step outline to it so there is more mass in the center of the part then
there is all around the part.  That is why I believe the BGA is in question
as well as the board.

Ronald D. Peeler Jr., B.S. IE 
Process Engineer 
SWEMCO 
Moorestown, NJ 08057 
Tel: (856).222.9900 ext. 31 
Cel: (484).948.0779 
Fax: (856).222.0700 
[log in to unmask]



-----Original Message-----
From: Kathy Kuhlow [mailto:[log in to unmask]]
Sent: Wednesday, April 25, 2007 4:33 PM
To: [log in to unmask]
Subject: Re: [TN] BGA Weights


Weighting it down is only a band aid fix, maybe duct tape would help. Is it
possible to support the PCB and reflow/replace the BGA's? 

Is there a thermal issue that caused the bga's to be open or do you think
the flexing has created opens?  

Kat


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ron Peeler
Sent: Wednesday, April 25, 2007 3:23 PM
To: [log in to unmask]
Subject: [TN] BGA Weights

Hello TechNet

I was wondering is there anything in the industry that is used to weigh
BGA's down?  We are having an issue @ our shop with BGA's not soldering
effectively to one of our boards.  Currently we have a board that is suppose
to go through a boot process, however it has problems doing so.  The issue
is resolved when you press down in the middle of the BGA and fails again
once the BGA is released.  It doesn't help that our board warps easily as
well.  Is there anything, small gram weights or so that can weigh down a BGA
without shorting it?

Thanks

Ronald D. Peeler Jr., B.S. IE 
Process Engineer 
SWEMCO 
Moorestown, NJ 08057 
Tel: (856).222.9900 ext. 31 
Cel: (484).948.0779 
Fax: (856).222.0700 
[log in to unmask]

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