X-ray, and 100% as these are military boards. It doesn't tell you how GOOD
the joints are but it tells you that the BGA is located correctly, that the
solder joints are complete and that there is no bridging. I've yet to come
across a scope that can see past more than the first two rows of contacts,
and even then the view is pretty limited.

You might consider ultrasonic inspection if you don't like X-ray, but
visual inspection wouldn't be enough for our application. If you're more
commercial, and you're confident that your process is controlled and
repeatable, and you have been getting reliable product, then batch sampling
and X-raying is all you need. You sample size and frequency will depend on
product volume and experienced failure rates.

Pete Duncan



                    Rick Howieson
                    <RHowieson@DELTAGRO        To:     [log in to unmask]
                    UPINC.COM>                 cc:     (bcc: DUNCAN Peter/Asst Prin Engr/ST Aero/ST Group)
                    Sent by: TechNet           Subject:     [TN] BGA
                    <[log in to unmask]>


                    06/29/01 01:36 AM
                    Please respond to
                    "TechNet E-Mail
                    Forum."; Please
                    respond to Rick
                    Howieson






For the folks out there doing BGA assembly, do you use x-ray for inspection
and if so, how often. I'm curious whether we need to purchase x-ray or a
scope that allows side viewing.
Thanks,
Rick Howieson
Delta Group Electronics, Inc.

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

Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
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 delivery of Technet send the following message: SET
Technet NOMAIL
Search previous postings at: www.ipc.org > On-Line Resources & Databases >
E-mail Archives
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700
ext.5315
---------------------------------------------------------------------------------

---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
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 delivery of Technet send the following message: SET Technet NOMAIL
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------