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October 2010

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Subject:
From:
Mike Sewell <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Mike Sewell <[log in to unmask]>
Date:
Wed, 27 Oct 2010 07:42:40 -0500
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I've broken down the tracer by repeated exposure to a UV curing oven
(Dymax UV cured coating) but never seen it on just a trace.  So what is
special with just those traces?  Do they look "normal" under white
light?

Mike

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
Sent: Wednesday, October 27, 2010 7:30 AM
To: [log in to unmask]
Subject: [TN] Disappearing Fluorescence

Good morning all,

I posted a picture to the IPC Technet gallery.

http://ipc-technet.groupsite.com/gallery/16251

This is taken from a failure analysis effort I am working on.  Its
amazing 
what happens to electronics when you spill coffee into them.

One of the assemblies I have been looking at has a very odd visual
effect 
that I have never seen before.  The conformal coating has a fluorescing 
dye to it that glows blue under black light, which is common.  Notice
how 
the fluoresence has disappeared from the areas over one set of traces.
I 
have seen fluorescence disappear before, but it usually heat releated
and 
over a large area, nothing highly localized like this.  My first thought

was that there had been a jumper wire installed in these locations, but 
that is not the case.

I showed this to my good friend Phil Kinner at Humiseal, who is no 
stranger to the wierd and wacky world of conformal coating oddities, and

he has not seen anything like this either.

Anyone else seen this?

Doug Pauls

Maybe this could be one of Inge's Friday quiz items............

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