I may owe the group an apology... For the curious, I'll answer the questions people asked me: - the product has been in production for a long time with no problems. - product must operate at 125C, so after ICT we do a "hot" functional test. - all at once we had massive fallout, ICT okay, hot NOT. - failures in random locations, unpredictable - same vendor, all boards from same same date code - bare-board vendor on chinese holiday, no response yet We sent a few failed assemblies out to be analyzed, and the picture I provided in the link below was the first thing we got back, but with no analysis Since then we have found cracked via barrels, which seems to be a more likely culprit. (but I'm no expert) If I asked for help without waiting for enough supporting info, I'm sorry. but I would like to know more about "cross section artifacts"? Where can I learn about that? I can't visualize how the cross section could be a normal beginning or an ending of a trace, but maybe I'm showing my ignorance willing to learn, Jack . On 2/7/08, [log in to unmask] <[log in to unmask]> wrote: > > Beware of cross section artifacts. If this is not the sites you were > aiming for it may not be a defects. Could the beginning of a trace or > the ending. I see this often. > > > Victor, > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson > Sent: Thursday, February 07, 2008 9:33 AM > To: [log in to unmask] > Subject: [TN] FAB: Thin Trace Failures > > Has anyone ever seen a cross-section like this? > > http://www.frontdoor.biz/PCBportal/opentrace.jpg > > (ignore the words on the pic, just a guess) > > Can you point me in the right direction for cause? > > thanks, > Jack > > > --------------------------------------------------- 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 -----------------------------------------------------