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December 2006

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Subject:
Re: water water everywhere!
From:
Gary Crowell <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Mon, 4 Dec 2006 17:11:08 -0700
Content-Type:
text/plain
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text/plain (66 lines) 
Just an observation, all of the blacked areas/vias seem to be on the
perimeter of something that was in contact with the top side of the
board, like a shield or cover of some sort.  On the top side photo,
lower edge, a mark runs below the silkscreen legend for S21, thru C45,
C43, U24 and R151.  Next to the battery holder, it runs vertically thru
C34, C35, and C17.  Across the top it runs thru C31, T31.  Unless I'm
seeing shadows...  Maybe something in contact with the board/vias
prompted corrosion?


Gary Crowell
Micron Technology


> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
> Sent: Monday, December 04, 2006 9:27 AM
> To: [log in to unmask]
> Subject: [TN] water water everywhere!
> 
> The following files show the two sides of a PCB in a professional
> weather station. This shows four dark areas which the manufacturer has
> ascribed to water penetration. These are centred on a hole. The whole
> thing seems funny to me, as it has happened on only a few of 
> the holes.
> I understand that it was housed in a water-tight case, not 
> very far from
> the Pacific coast. I was not able to ascertain the laminate 
> type, but it
> would not surpise me if it were paper based (FR3?).
> 
> Has anyone seen anything like this?
> 
> Brian
> 
> http://www.realweatherstation.com/FILES/DSCN9441.JPG
> http://www.realweatherstation.com/FILES/DSCN9440.JPG
> 
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