We have a very low volume of BGA boards, and they're new to us (or we're
new to them). I haven't built up any trust in them or the soldering process
yet to risk anything except 100% X-ray, expensive though it is for us as we
don't have the machinery ourselves.

I infer that you cannot justify buying a parallel X-ray machine to widen
the bottleneck, so another option would be to do sample inspection, based
on the percentage of fault-free yield you can detect with X-ray for each
board type. Especially if you have functional test at the end of the
process, you can perhaps afford to reduce the traffic through the
bottleneck without risking a drop in quality or yield.

Pete Duncan





                    Phil Bavaro
                    <pbavaro@QUAL        To:     [log in to unmask]
                    COMM.COM>            cc:     (bcc: DUNCAN Peter/Asst Prin Engr/ST Aero/ST Group)
                    Sent by:             Subject:     [TN] BGA Xray Inspection:  100% or SPC
                    TechNet              controlled
                    <[log in to unmask]
                    ORG>


                    06/20/01
                    01:01 AM
                    Please
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                    Phil Bavaro






Here is a question that many of you have had to deal with.......

Do you xray image inspect 100% of your BGA solder connections

or

do you only process a sample of your production volumes thru xray

or

do you not require xray inspection unless a test failure occurs on the
board?


We have bgas on close to all of our boards these days and even with
inline automatic xray equipment, it is becoming a bottleneck for
production.

I hesitate to release my xray inspection control on anything but
extremely high yielding boards unless there is very high functional
test coverage to ensure that we don't let bad product out of our
facility.

I am just wondering what the rest of the industry has adopted as a
policy for this problem.

Thanks in advance.

Phil

Phillip A. Bavaro
QUALCO/\/\/\/\  Incorporated
Manufacturing Engineer, Staff
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Cell (619) 602-8644 (offsite, after hours)
Pager (619) 271-3640
Tel (619) 658-2542 Office/voice mail
Cell (619) 845-9968 (workday)
Fax (619) 658-1584

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