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May 2007

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From:
"Braddock, Iain" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Braddock, Iain
Date:
Wed, 9 May 2007 10:42:11 +0100
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Chuck,
 
That was my comment to the Lab however they were adamant that wasn't the
case. The area under the blasted part on pic 1 was delaminated but due
to the surface of the Cu being etched away. They managed to replicate
the etched area on the Cu under the Polyimide and the fact it became
conductive by placing a spot of Alkaline on the board.
 
I will be checking another board with similar test fault though that
will not be until next week.I'll let you now the outcome.
 
Regards,
    Iain.

________________________________

From: [log in to unmask] [mailto:[log in to unmask]] 
Sent: 08 May 2007 17:54
To: TechNet E-Mail Forum; Braddock, Iain
Subject: Re: [TN] Strange one?


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Iian, 

Stop fixing small shorts with your hi pot tester.  Wow, Big flash and
the short is gone leaving you on pic 1 a delaminated area and on pic 2
the burnt remains.   

Bet if you look real close you will find a sliver of metal or a copper
fiber. 

Chuck Brummer
3M Manufacturing Engineer
8357 Canoga Ave.
Canoga Park, CA 91304-2605
(818) 734-4930




"Braddock, Iain" <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]> 

05/08/2007 09:23 AM 
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
"Braddock, Iain" <[log in to unmask]>


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Subject
[TN] Strange one?

	




Hi all,

Stevie G has been kind enough to post a couple of pics of a flexi
anomaly I've come across.

Been having problems with some flexi-rigid boards failing at Ins/Cons
test due to insulation breakdown - tested at 200v.

Had the lab do some exploratory work and the guys have come up with
these pics.  along with the fact that the Polyimide was conductive
around the areas highlighted on the pics. but only localised. The Lab
view seems to be that something was left on the board during fabrication
and caused the problem; they have their suspicions but would like to
know if anyone else has encountered a similar problem.
 

http://stevezeva.homestead.com/files/Flex_Problem_1.JPG
<http://stevezeva.homestead.com/files/Flex_Problem_1.JPG> 

http://stevezeva.homestead.com/files/Flex_Problem_2.JPG
<http://stevezeva.homestead.com/files/Flex_Problem_2.JPG> 


Regards,
   Iain.


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