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August 1999

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Subject:
From:
Phil Crepeau <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 18 Aug 1999 11:26:10 -0700
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hi,

you might try looking at it with a 'feinfocus' x-ray machine.

phil

-----Original Message-----
From: Francisco Rios [mailto:[log in to unmask]]
Sent: Wednesday, August 18, 1999 10:22 AM
To: [log in to unmask]
Subject: [TN] micro-fractures on BGA joints


Hi:
I have some boards with BGA packages that were failing diagnostic tests b/c
of open joints (diag test is run and it fails, then the tech will press down
on the suspect component and the test passes).  Cross sectioning of some of
the components revealed micro-fractures near the ball/board joint.  I've
been working on a 5DX x-ray machine to try to detect these micro-fractures,
but have had no success; the fractures are simply too small to see within
the shading of the large ball and solder.  Is anyone out there also using a
5DX system for inspecting BGAs and have come across a similar problem?  Or
is any other x-ray system capable of detecting this type of defects?
Thanks for any advice or suggestions,
Francisco Rios
Test Engineer

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