REALLY? Enough to stretch traces and tear up soldermask? Wow! I have never seen anything like that! Steve -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Werner Engelmaier Sent: Tuesday, February 02, 2010 8:12 PM To: [log in to unmask] Subject: Re: [TN] track lifting Hi Steve & All, A 'mechanical hit' would not cause this. While the pic is less than fully illuminating, I have seen similar 'buckle ups' with Pb-free solders/soldering before. We need to remember, that SAC is 40% stiffer than SnPb, has a higher yield strength and creeps about a factor of 50 slower—it thus, becomes a mechanically significant layer with a higher CTE than Cu and the PCB(x,y). Werner -----Original Message----- From: Steve Gregory <[log in to unmask]> To: [log in to unmask] Sent: Tue, Feb 2, 2010 6:10 pm Subject: Re: [TN] track lifting Hi Pearl, Here's your picture: http://stevezeva.homestead.com/files/Track_Lifting.JPG What I see in the picture is that BGA (it is a BGA isn't it?) was almost ripped-off the board somehow. The traces are stretched and the soldermask has been torn up from the board. The root cause is that something mechanically hit the BGA and ripped up pads and traces. Is there any other marks on the BGA? Steve -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of pearl petras Sent: Tuesday, February 02, 2010 5:13 PM To: [log in to unmask] Subject: [TN] track lifting While we wait for IPC to set up a picture site, could I impose on Steve to post another picture? Any comments as to what could possibly be the root causes of this is much appreciated. Thanks so much __________________________________________________________________ Yahoo! Canada Toolbar: Search from anywhere on the web, and bookmark your favourite sites. Download it now http://ca.toolbar.yahoo.com. --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------