Poor wedding, with other words. How do you perform the die'n'pray ? It's a little unsafe method, you easily introduce false evidence. I use to cool down to LN2 first and knock the part against a granite stone or anything else that is steady. If the wetting is rotten, you get a 'ping' and off jumps the BGA. If you don't get that result, the main part of solder joints are very, very good. Now, still at LN2 level, bend the board over a pencil (if the boards longitude is > 10" and a prop smaller object if < etc). I don't have the recommended radius in my head. If the BGA is still there, I bet all sjs are good. Not a test for rookers, but with years of component testing behind, you get an idea wheather the sjs are catastrophic or not. I If you could blow up the pics two or three times, it would be a better situation for us old dogs. I have seen what you see with your younger eyes, will look in my piles for some reports. But Dave the hawkeyed or Wayne the wizard will probably have an answer befor that. Inge ----- Original Message ----- From: "Thayer, Wayne - IIW" <[log in to unmask]> To: <[log in to unmask]> Sent: Monday, October 11, 2010 8:54 PM Subject: Re: [TN] Mech. damage or poor wetting? Never mind. I just read the original post. I'm betting the whole shebang is due to poor wetting--that's why the correlation to the fanout escape. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Thayer, Wayne - IIW Sent: Monday, October 11, 2010 2:52 PM To: [log in to unmask] Subject: Re: [TN] Mech. damage or poor wetting? What's going on with the picture of the cross section? The ball isn't wetting down the side of the plated pad. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Chris Mahanna Sent: Monday, October 11, 2010 2:41 PM To: [log in to unmask] Subject: Re: [TN] Mech. damage or poor wetting? Here are a few pictures http://ipc-technet.groupsite.com/gallery/16011 this job is a mixed bag. Currently we suspect soldering, cratering, ICT and t-cycling damage Chris From: [log in to unmask] [mailto:[log in to unmask]] Sent: Monday, October 11, 2010 2:22 PM To: TechNet E-Mail Forum; Chris Mahanna Cc: [log in to unmask] Subject: Re: [TN] Mech. damage or poor wetting? Hi Chris - do you have any pictures you can share? Dave Hillman Rockwell Collins [log in to unmask] Chris Mahanna <[log in to unmask]> Sent by: TechNet <[log in to unmask]> 10/11/2010 11:29 AM Please respond to TechNet E-Mail Forum <[log in to unmask]>; Please respond to Chris Mahanna <[log in to unmask]> To [log in to unmask] cc Subject [TN] Mech. damage or poor wetting? We have a BGA dye-n-pry job that shows board side sj damage with a strong correlation to fan-out clocking. We also have some microsection evidence of poor wetting. All damage/dye is on perimeters. Is this an indication of heat sinking and subpar wetting, or can it be completely mechanical? Both? Thanks Chris ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- This e-mail and any files transmitted with it may be proprietary and are intended solely for the use of the individual or entity to whom they are addressed. If you have received this e-mail in error please notify the sender. Please note that any views or opinions presented in this e-mail are solely those of the author and do not necessarily represent those of ITT Corporation. The recipient should check this e-mail and any attachments for the presence of viruses. ITT accepts no liability for any damage caused by any virus transmitted by this e-mail. ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------