I like this guess. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Rex Waygood Sent: Monday, October 26, 2009 4:19 AM To: [log in to unmask] Subject: Re: [TN] Questions Dear Manuel I don't know if this is the cause of your problem but I have seen a similar small number of joints with this appearance on a few boards in the middle of a batch being caused by a problem with under screen cleaning. The cleaning fluid contaminates the solder paste in a few places but clears up after a few prints. It is associated with a stencil problem where the operator decides to manually intervene. :-) Regards Rex Rex Waygood Technical Manager Hansatech EMS provides value manufacturing through engineering and quality Hansatech EMS Limited Benson Road Nuffield Industrial Estate Poole -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of stephengregory5849 Sent: 26 October 2009 01:41 To: [log in to unmask] Subject: Re: [TN] Questions Hi Manuel, I'm sorry I didn't get your pictures posted sooner, but I have them up now, and I'm posting everything to the TechNet for you. Your pictures are here: http://stevezeva.homestead.com/1a.JPG http://stevezeva.homestead.com/2a.JPG http://stevezeva.homestead.com/3a.JPG http://stevezeva.homestead.com/5a.JPG I posted the pictures that looked the best to illustrate your problem, a couple of pictures were out of focus and it was hard to see the problem. Were the IC's the only component that had this problem? That pretty much eliminates the solderpaste if it was. It makes it harder to figure out when you say that it was random and only on three boards. What was the lead finsh on the IC's? I've had a few problems with lead-free (tin) plating, but it's been with connectors. Steve ----- Original Message ----- From: Manuel Castro To: [log in to unmask] ; Werner Engelmaier Sent: Friday, October 23, 2009 7:00 PM Subject: Re: Questions Steven, Attached are the photos of the issues. We run this assembly through our SMT oven and got a few boards (3) with this phenomenon at some of the leads on this FPIC. The IC was the same part number but the location was random on all 3 boards. The chemistry utilize during this build was Lead Free NC. How do I send the email to everyone at the TechNet forum?... Thank you All... Best regards, Manuel Castro Jr. Senior Process Engineering Manager [log in to unmask] Office: (408) 964-3044 Fax: (408) 964-3001 On Fri, Oct 23, 2009 at 1:14 PM, Werner Engelmaier <[log in to unmask]> wrote: Hi Manuel, Steven is the GOOD guy doing the posting on his website-he recently changed jobs, e-mails, etc.; so it might be best to ask him directly. Werner -----Original Message----- From: Manuel Castro <[log in to unmask]> To: [log in to unmask] Sent: Fri, Oct 23, 2009 1:11 pm Subject: Questions Hi Werner, I love to follow all TechNet forum but I still don't know where the picture get posted from everyone that has an issue. Can you kindly tell me what the link is. Do we need a password to access the pictures. Lastly, if I have an issue where do I post the picture to share with the team or whom do I sent it to? Best regards, Manuel Castro Jr. Senior Process Engineering Manager [log in to unmask] Office: (408) 964-3044 Fax: (408) 964-3001 CONFIDENTIALITY This e-mail message and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail message, you are hereby notified that any dissemination, distribution or copying of this e-mail message, and any attachments thereto, is strictly prohibited. If you have received this e-mail message in error, please immediately notify the sender and permanently delete the original and any copies of this email and any prints thereof. ABSENT AN EXPRESS STATEMENT TO THE CONTRARY HEREINABOVE, THIS E-MAIL IS NOT INTENDED AS A SUBSTITUTE FOR A WRITING. 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