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November 2002

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From:
"d. terstegge" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 13 Nov 2002 16:09:36 +0100
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Hi Michael,

X-ray machines are great tools for setting up a process and controlling
it, but they also have some serious limitations. It's hardly possible to
catch opens during a routine inspection, and even if you know exactly
where the opens are it may still be very difficult to find a visual
deviation. And then I'm talking about a good machine with tilting
capabilities and a skilled operator.

Daan Terstegge
Thales Communications
Unclassified mail
Personal Website: http://www.smtinfo.net


>>> [log in to unmask] 11/13/02 02:12pm >>>
We have a 316pin BGA asic that has been FIB'ed (modification of
circuitry). The BGA needs to be re-set because we've determined
intermittent opens. Our assembler is suggesting an xray after the
re-work.
Is it worth it? and I don't recall any hazards to the BGA in doing
this.
The archives didn't prove out for good or for ill.

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