Hi,

We recently had a run of PCBA's where round delaminated areas showed up in
the boards after convection reflow.  The areas are random and up to 2" in
diameter.  They weren't noticeable to visual inspection prior to running
through the oven.  I have 2 questions:

1. What might be the cause of this type of defect in the PCB?

2. Are there any independent test labs that could evaluate this and verify
the cause?

The reason for the 2nd question is that we're going back and forth with our
customer and their PCB supplier as to root cause and therefore, whose
responsibility it is.

Any feedback would be appreciated.


                Rick Thompson
                Ventura Electronics Assembly
                2665A Park Center Dr.
                Simi Valley, CA 93065

            [log in to unmask]

                (805) 584-9858 voice
                (805) 584-1529 fax

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