This question looks exactly as one asked a few weeks ago. > -----Original Message----- > From: Macko, Joe @ IEC [SMTP:[log in to unmask]] > Sent: Friday, October 03, 2003 11:33 AM > To: [log in to unmask] > Subject: [TN] BGA retention > > Fellow Techs, > > We are assembling a double sided board with BGAs on both sides. One board > seems to be having a problem with a 21 mm sq. pbga that is initial > installed on the 1st side and then goes through the reflow oven again, > upside down during the 2nd side reflow. It looks like the bga is dropping > slightly when it goes through the reflow oven for a second time, upside > down. > > Does anyone have any ideas on how to either temporarily or permanently > secure the bga in place after the 1st side reflow so the bga does not pull > away from the board slightly during the 2nd side reflow? Tacking the > corners with some type of epoxy that would not affect long term > reliability? thanks > > joe > > --------------------------------------------------- > Technet Mail List provided as a free 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 > 847-509-9700 ext.5315 > ----------------------------------------------------- > --------------------------------------------------- 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 847-509-9700 ext.5315 -----------------------------------------------------