Forget the flying probe testing, the problem is way before that and OSP or 
not this is a reject.  There is no copper in this hole and not even any 
etchback near the inner layer viewed. 

The statement about not testing with a flying probe after OSP is fine. 

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




From:
J W <[log in to unmask]>
To:
[log in to unmask]
Date:
09/09/2009 07:42 AM
Subject:
[TN] PTH problem
Sent by:
TechNet <[log in to unmask]>



 Hi TechNet group,

I'm really getting nervous about a China bare board supplier and their
quality and need your opinions.  Please take a look at the picture by
clicking on the link below showing two plated through holes (via's).  The
problem reported originally was a bad ground connection between ground 
via's
and ground planes.  As you can see, the pictures are very telling, and you
can clearly see the ground plane not connected (several planes not 
connected
actually).  What I'm also nervous about is the comment listed below the
pictures "The plated copper on PTH surface will be etched thin after OSP
process".  Is that statement correct?  I'm not a bare board expert by any
means, but I believe a PTH should have a little more copper than what is
shown?  I know that OSP is not something new, so are other board suppliers
dealing with the same issue of possible thin PTH walls because of OSP?

I also submitted pictures early last week regarding the same supplier 
having
problems with the their solder mask process, so to me, I'm thinking this
board shop is not up to standards and we should inform out board assembler
house to look for another supplier...immediately?

Thanks for your help!

Jim

http://stevezeva.homestead.com/PTH_Connection_issue.jpg

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