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Date: | Thu, 4 Nov 2004 16:27:48 -0800 |
Content-Type: | text/plain |
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hi,
i vote for air entrapment in the hole.
phil
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Joe Spicuzza
Sent: Thursday, November 04, 2004 3:27 PM
To: [log in to unmask]
Subject: Re: [TN] Via hole failures (with pictures)
Looks like a bad drill bit, or possibly, poor desmear.
-----Original Message-----
From: Al Onderick [mailto:[log in to unmask]]
Sent: Thursday, November 04, 2004 5:55 PM
To: [log in to unmask]
Subject: [TN] Via hole failures (with pictures)
I have a couple of boards that have failed at a customer site. After
testing, a via was identified as open. The following link is a picture of
the cross section.
http://www.tier1gear.com/temp/via_crack.jpg
The board was .062, the via .010 and the surface finish immersion white
tin.
I would appreciate any insight into what may cause a failure like this.
Al Onderick
National Instruments
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