Hi, My past experience was that the outgassing from the BGA that cause the BGA to "jump" off the pads. I am not sure if you are facing the same symptom that I had. Anyway, bake the BGA will kill off the "hopping". It also can happen to other kind of components. Good Luck ! KH Poh At 08:15 AM 8/22/05 +0700, Le Thanh Tung wrote: >Hello everybody. >At present, we are facing to one problem as below: >BGA component is shifted after go through reflow machine. >We have checked 100% mounting condition at BGA location before reflow, we >sure the BGA is not shifed but after reflow the shifted part defect still >happened. >although we lost much time to investigate but the problem is still not be >overcome. >The detail of BGA is as below: > - BGA size: 15 x 15 > - Pitch: 1 mm > - Ball dia.: 0.49 mm > - Product: RoHS PCBA >Anyone who have this experience? >Thanks > >--------------------------------------------------- >Technet Mail List provided as a service by IPC using LISTSERV 1.8e >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 1.8e 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 -----------------------------------------------------