I'd be nervous too after looking at the microsections. There is no
significant copper plating in the pths. Totally scrap this lot and find
another supplier.
Regards,
Tom Carroll, CQA, CIT
Supplier Quality Engineer
Boeing Integrated Defense Systems - East Region Supplier Quality
Home Office Phone/FAX: 845-753-5932
Temp Office Phone at Alabama Aircraft Indus Inc (205) 510-4783
Temp Office FAX at AAII (205) 592-0295
Boeing Cell: 215-692-2463
email: [log in to unmask]
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of J W
Sent: Wednesday, September 09, 2009 10:41 AM
To: [log in to unmask]
Subject: [TN] PTH problem
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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