Thanks to all of you who responded to my question and I forward some of
those to our reliability engineer and hardware QA investigation the
field failure.  They found your responses "very informative". Currently
we do not cover the holes with anything because the manufacture of the
BGA recommend we do not.  Should we have?  Thanks again, Jon

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of John Burke
Sent: Wednesday, June 16, 2010 5:14 PM
To: [log in to unmask]
Subject: Re: [TN] BGA AFTER 2 YEARS IN FIELD FAILED

Those lids are made with holes in them, this is to stop the lid being
forced
off during a reflow cycle by the air under the lid expanding and
breaking
the bond line.

The corrosion you are seeing is likely to be due to ingress of water
during
a water wash after reflow. The boards should be allowed to fully cool to
room temp before entering the wash as if they are at a temperature above
the
wash water the cooling effect of the wash water will cool down the bga
and
the air under the BGA lid and could lead to water ingress as a result.

Best regards,

John Burke

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Roberts, Jon (SA-1)
Sent: Wednesday, June 16, 2010 12:26 PM
To: [log in to unmask]
Subject: [TN] BGA AFTER 2 YEARS IN FIELD FAILED

Has anyone experience a BGA failure after about 2 years, where under the
heat sink of the actual part (metal lid) corrosion has occurred.  The
lid does pop off, if you applied some pressure to examine, and what we
found was corrosion.  There appears to be two weep holes on the inside
of the part.  Unless you have seen it you are probably going to ask me
for some more information.  I will try and obtain any pictures as long
it as it does not show the manufacture.  Thanks, Jon


This communication is intended only for use by the addressee(s) named
herein
and may contain business confidential and/or legally privileged
information.
If you are not the intended recipient of this e-mail, you are hereby
notified that any dissemination, distribution, disclosure or copying of
this
e-mail and its contents is strictly prohibited. If you have received
this
e-mail in error, kindly notify the sender by replying to this message.
In
addition, please permanently delete the message and any attachments
without
copying or disclosing the contents. Thank you for your cooperation.

THIS DOCUMENT AND/OR SHIPMENT MAY CONTAIN COMMODITY ITEMS, SOFTWARE OR
TECHNICAL DATA THAT IS CONTROLLED BY U.S. EXPORT LAW, AND MAY NOT BE
EXPORTED OUTSIDE THE UNITED STATES OR TO NON U.S. PERSONS WITHOUT THE
APPROPRIATE EXPORT LICENSE FROM EITHER THE U.S. DEPARTMENT OF STATE OR
DEPARTMENT OF COMMERCE.

______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or
[log in to unmask] 
______________________________________________________________________

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


______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or
[log in to unmask] 
______________________________________________________________________

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

This communication is intended only for use by the addressee(s) named herein and may contain business confidential and/or legally privileged information. If you are not the intended recipient of this e-mail, you are hereby notified that any dissemination, distribution, disclosure or copying of this e-mail and its contents is strictly prohibited. If you have received this e-mail in error, kindly notify the sender by replying to this message. In addition, please permanently delete the message and any attachments without copying or disclosing the contents. Thank you for your cooperation.                                                                                                        
THIS DOCUMENT AND/OR SHIPMENT MAY CONTAIN COMMODITY ITEMS, SOFTWARE OR TECHNICAL DATA THAT IS CONTROLLED BY U.S. EXPORT LAW, AND MAY NOT BE EXPORTED OUTSIDE THE UNITED STATES OR TO NON U.S. PERSONS WITHOUT THE APPROPRIATE EXPORT LICENSE FROM EITHER THE U.S. DEPARTMENT OF STATE OR DEPARTMENT OF COMMERCE.

______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________

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