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April 2012

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Subject:
From:
Andy Price <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Andy Price <[log in to unmask]>
Date:
Mon, 30 Apr 2012 09:50:41 -0400
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text/plain
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Hi Mark,

There are document procedures, kits, materials and repair services that can support the BGA pad repair process. Like anyone else that does BGA rework, we will occasional see lifted or missing dead pads. Speaking in general, most folks require the pads to be replaced with the concern that the BGA solder ball will not have a target pad to attach to. 

Regards,

Andy Price
Sales Manager
[log in to unmask]
Direct Phone: 978-478-5102
Mobile Phone: 978-265-6728

Circuit Technology Center
22 Parkridge Road
Haverhill, MA 01835
Web: www.circuitrework.com
Phone: 978-374-5000
Fax: 978-372-5700 
"Surgeon grade rework and repair, by the book and guaranteed." 


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Goodyear, Patrick
Sent: Monday, April 30, 2012 8:10 AM
To: [log in to unmask]
Subject: Re: [TN] EXTERNAL: [TN] BGA repair guidelines

Circuit Medic carries the parts but they ain't cheap.   A master kit from Techni-tool will run around 785 or so.   

I just bought a bunch for the shop. 

Pat  

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gumpert, Ben
Sent: Monday, April 30, 2012 4:39 AM
To: [log in to unmask]
Subject: Re: [TN] EXTERNAL: [TN] BGA repair guidelines

Mark,

Check out IPC-7711/7721 4.7.3 "Surface Mount, BGA Pad Repair, Film Adhesive Method"
I'm sure that there are repair kits available, but I don't know any specific sources.

Ben

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of [log in to unmask]
Sent: Friday, April 27, 2012 10:24 AM
To: [log in to unmask]
Subject: EXTERNAL: [TN] BGA repair guidelines

Dear Forum;
 
During BGA assembly rework attempt on a Class 2 assembly, one of the pads lifted.  This pad has no connection.  It is not used.
I was looking for IPC guidance and found guidelines for PCB repair of traces, but so far found no reference for repair of a BGA pad.
 
Are there guidelines for BGA repair and are there kits available to replace a lifted pad?
 
What risk(s) would exist if the BGA were placed without that pad in place under the ball?.
 
Regards,
 
Mark Julstrom

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