Kerry,

maybe little odd type of failure this one: TI had problems with ball-off'ing, as they called it. Reason was that the packages had been exposed to humidity.

another reason can simply be that the BGA supplier used too much gold, if it was such an UBM system. We had some gold embrittlement BGA ball-offs some years ago. Also very rare.

Your case must be very unique in these days of BGA perfection...

Ingemar

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Kerry McMullen
Sent: den 13 juni 2005 18:09
To: [log in to unmask]
Subject: [TN] BGA Intermittent Saga, part 2


Hi Technetters,
Looks like we might have solved our BGA intermittent.  Two boards were
accidently dropped from  a height of 12" (off a tray).  The (4) 1028 ball
BGAs popped off both boards!  What is really interesting is that all the
balls stayed on the boards, not on the device substrate.   Any idea what
would cause this?  I know that you normally need a hammer to get a BGA off
the board (unless you have an SRT).  The device sees about 205 C at peak.

Thanks in advance?
Kerry

---------------------------------------------------
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
-----------------------------------------------------