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Reply To: | TechNet Mail Forum. |
Date: | Tue, 4 Nov 1997 09:16:13 -0500 |
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In a message dated 97-11-04 05:05:57 EST, you write:
> Can any one help me with a solution to this problem,
I'll give it a shot.
> we have recently experenced board failures because of a contamination
> across various sm capacitors which first looks like a splat of black
paint
> which run diagonally across the cap, under a microscope it looked like
> fern leaves.
The black material could be a number of things: dense dendritic growth,
carbonizing from an arc, leaking electrolytic solution from a cap, stray
encapsulant material, etc. If I could see it, I would have a better idea.
Any chance of making a digitized photo and sending me one? The "fern leaf"
structure indicates it is probably dendritic growth.
> Our boards are wave soldered and w edo not clean after solder flow.
What are you wave soldering with and are you mixing any flux technologies?
Doug Pauls
CSL
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