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April 2008

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Subject:
From:
Victor Hernandez <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Tue, 29 Apr 2008 10:08:23 -0500
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What was the blue dye used for?

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson
Sent: Monday, April 28, 2008 10:03 PM
To: [log in to unmask]
Subject: [TN] Blue Voids

Greetings!

Once again I am caught in the middle of a bare board problem,
(never the same thing twice!)
Maybe after a few more decades of failure I might become more
proficient at evaluation, but in the meantime....
Does anyone have a quick reaction to this picture?

http://frontdoor.biz/PCBportal/bluevoid.jpg

I'm told there are voids in the glass fiber bundles.
When I reported it to the manufacturer, they asked that blue
dye be applied to see the penetration. It all looks blue!
(and other areas look "bluer" than the problem area to me)
The description in IPC-A-600 is too brief to comprehend
and I can't find anything in Printed Circuits Handbook about it.
anyway,
I'm not doubting anything I've been told by "the experts",
my question is:

How would you handle this if you saw it in YOUR report?

reject?
use the boards but ask for corrective action?
process indicator but not really a problem?
not sure, but monitor with more xsec?

onward thru the fog,
Jack

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