I agree, it's most probably what I like to think of as "A case of Clean Room Fly"! I explain: Many years ago a customer returned a roll of "Nitto" tape very upset because it had a fly embedded in it. Although it was impossible, it had happened, but also because it was impossible there was nothing to investigate, though we did and found nothing. Best Wishes Mike -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Kerr, Bryan (UK) Sent: Wednesday, July 31, 2013 8:04 AM To: [log in to unmask] Subject: Re: [TN] Singular 30% Void and Oversize Ball Diameter Hi Leland Seems like a random event to me if you are running thousands of boards a day. Even a minute trace of some volatile material on the ball or PEC pad could cause this. Perhaps not worth losing sleep over and put it in the memory banks ! Regards Bryan Kerr Principal Quality Engineer CMA Lab and Process Engineering BAE Systems Maritime Services Manufacturing Hillend Hillend Industrial Estate Hillend Nr Dunfermline Fife Scotland KY11 9HQ 01383-836097 -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Leland Woodall Sent: 30 July 2013 19:18 To: [log in to unmask] Subject: [TN] Singular 30% Void and Oversize Ball Diameter ----------------------! WARNING ! ---------------------- This message originates from outside our organisation, either from an external partner or from the internet. Keep this in mind if you answer this message. Follow the 'Report Suspicious Emails' link on IT matters for instructions on reporting suspicious email messages. -------------------------------------------------------- Folks, We run thousands of boards a day, and almost every one carries a BGA. We inspect each with inline X-ray. Last week, we had one single ball to fail for a 30% void and an oversize diameter. We contacted the supplier, and they said their process was incapable of sending out such a defect. We've never had a void over 5%, and even those are incredibly rare. What within our process might have caused this, and do you agree with the statement of the supplier? How do you recommend we analyze the failure? Thanks in advance for your help! Leland ________________________________ "Confidentiality Notice: This transmission (including any attachments) may contain confidential information belonging to the sender and is intended only for the use of the party or entity to which it is addressed. If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution, retention or the taking of action in reliance on the contents of this transmission is strictly prohibited. If you have received this transmission in error, please immediately notify the sender and erase all information and attachments." ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ ******************************************************************** This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. ******************************************************************** ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________