Dear Mr. (Ms?) Jerky,
If you look closely, you can see evidence of the "paint" or
discoloration only on some of the pads and along some of the traces, but
not on the soldermask area around it. It also appears to have blocked
the etching process, leaving etching flaws between the traces,
especially those on the left side of the image. I say appears, because
they may not be copper bridges, but paint bridges. 
But based on the fact that none of the paint appears on the board
surrounding certain pads but is covering those pads, it has to be a
problem that originated during fabrication of the pwb.
On the other hand, there are areas of solder mask covered with the
paint.
It is hard to judge from the picture, but is it possible that you have
two problems, one being a poor plating process, the other splattered
paint from some other process during assembly or fabrication? I think
some of the orange in the picture is unplated copper, some orange that
is a slightly darker shade is paint.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of John Burke
Sent: Monday, October 02, 2006 12:14 PM
To: [log in to unmask]
Subject: Re: [TN] Customer or Supplier Inherent Defect? Share your views

There are indications that the paint was on the board prior to solder
paste and reflow.

John

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Saint Jerky
Sent: Monday, October 02, 2006 4:49 AM
To: [log in to unmask]
Subject: [TN] Customer or Supplier Inherent Defect? Share your views

I encounter 1pcs of excess paint on PCB returned from customer.
Upon analysis by Supplier, they concluded that customer created the
defect.
The details is as below:
Defect: Paint spread over the PCB
Analysis:
1) The affected surface was subjected to the fluxing process again and
the stain was found to be removed from the process.
2) The stain is unlikely to have been incurred during the bare board
processing, as fluxing process is conducted just before Final Inspection
and Packing,
3) If the stain is incurred during the bare board processing, it will
have been cleaned up during the fluxing process prior to inspection.
4) Final Inspection and packing does not uses any material that yield
such a colour substance
Photo: http://img242.imageshack.us/img242/7362/bareboardzd6.jpg

Based on the photo, tell me what you guys think? The chances that
customer created it is higher or supplier? Come and share your views for
my reference. Thanks.

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