Azman, what you have is not warpage, but delamination. This means that the BGA, being a moisture sensitive device, had too much moisture inside and it got delaminated during reflow. You will get all the details you need in J-STD-033 and J-STD-020, available at http://jedec.org/download/default.cfm Regards, Ioan -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Azman Sent: Wednesday, May 03, 2006 9:47 AM To: [log in to unmask] Subject: [TN] BGA problem Hi TechNet members, I have one issue that I encountered recently whereby my BGA has warped after reflow. Please see attached link below to see how does the warped BGA look like. The BGA type is FPBGA and my reflow profile is OK. Your input and comment is greatly appreciated to help me solve this issue. http://img72.imageshack.us/my.php?image=bgawarp9ot.jpg Regards, --------------------------------------------------- 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 -----------------------------------------------------