Richard, I've got to disagree with your disagreement! It is not rework because it is not in compliance with the BGA component's print. If I buy a Motorola BGA and replace the SAC balls with Sn63 then there is no way Motorola will recognize it as their part, it does not match their datasheet any longer since their data sheet says SAC. The way to make it drawing "legal" would be to create an intermediate "altered item" drawing for a modified BGA, or else to have a drawing note on the CCA drawing that says to modify the part. Simply having a drawing note that says the assembly is to be Sn63 only results in a non-buildable drawing. At least I wouldn't accept it. regards, - Graham -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D. Sent: Thursday, June 02, 2011 10:20 AM To: [log in to unmask] Subject: Re: [TN] 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. ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. 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