I would agree it is a rework if the document you describe exists;
however, such a document may or may not require customer approval.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Marsico, James - ES
Sent: Thursday, June 02, 2011 9:35 AM
To: [log in to unmask]
Subject: Re: [TN] Re-balling BGAs
If you create a "from-to" drawing, taking the purchased part and
changing the balls, and giving this drawing a new number which appears
on your CCA parts list, then the modified component will meet your
internal drawing. I don't think modifying a part to enhance
functionality would be considered repair, as long as it's documented in
a controlled drawing.
Jim Marsico
ITT Corporation
1500 New Horizons Blvd.
North Amityville, NY 11701
631-630-5079
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Thursday, June 02, 2011 9:29 AM
To: [log in to unmask]
Subject: Re: [TN] Re-balling BGAs
From IPC 7711, caps are mine.
2. Rework
The act of reprocessing non-complying articles, through the use of
original OR EQUIVALENT processing, in a manner that assures full
compliance of the article with applicable drawings or specifications.
3. Repair
The act of restoring the functional capability of a defective article in
a manner that precludes compliance of the article with applicable
drawings or specifications.
-----Original Message-----
From: Stadem, Richard D.
Sent: Thursday, June 02, 2011 8:20 AM
To: [log in to unmask]; 'TechNet E-Mail Forum'
Subject: RE: Re-balling BGAs
I'm sorry, but I completely disagree with that logic. Rework is defined
as bringing a component or CCA into full compliance with print
requirements. If I have a BGA with SAC alloy balls, remove the SAC balls
and re-attach Sn63 balls and use that re-balled BGA on a CCA whose print
requires Sn63, then it is rework, not repair.
One does not need to follow the original manufacturing method. That is
completely irrelevant.
You can rework a CCA (or a component) using hot gas, hot air, laser,
solder iron, selective solder, selective vapor phase soldering, and any
number of other methods.
By your definition, any touchup done with a solder iron on a board that
had been vapor-phase soldered would be considered a repair, and thus
would require approval by the customer. Do you do that?
-----Original Message-----
From: [log in to unmask]
[mailto:[log in to unmask]]
Sent: Thursday, June 02, 2011 6:08 AM
To: Stadem, Richard D.
Subject: RE: Re-balling BGAs
June 2, 2011
Because re-balling is not the original manufacturing method used by the
part manufacturer and the difference between repair and rework is when
you follow the original manufacturing method (like replacement of a part
soldered on an assembly) it is considered a rework and not a repair.
However, if you are not following the original manufacturing method it
is considered a repair and therefore the process of re-balling is a
repair not a rework.
-----Original Message-----
From: Stadem, Richard D. [mailto:[log in to unmask]]
Sent: Wednesday, June 01, 2011 5:43 PM
To: TechNet E-Mail Forum; Bogert, Gerald L (Contractor)
Subject: RE: Re-balling BGAs
Why would it be a repair?
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gerald Bogert
Sent: Wednesday, June 01, 2011 2:22 PM
To: [log in to unmask]
Subject: [TN] Re-balling BGAs
June 1, 2011
Anyone have technical data to support (or not support) re-balling of
BGAs to change from SAC balls to Pb balls???
My understanding is that because of the extra heat cycle involved, BGA
manufacturers may not stand behind their part warranty if re-balling is
done. I also seem to recall a technical poster or paper presented at
IPC several years ago which I believe indicated a reduction in
reliability of the part if it is re-balled.
Also seems to me that if one were to re-ball a BGA, this would be a
repair and not a reqork process and as such may require specific
customer approval.
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