If any of the parts, including the PCB, is pure tin plated, I would
suspect that the stressed metal from forcing in the connector may be
whiskering.
Brian
Karen Walters Ebner wrote:
> We recently moved from soldered connectors to press fit connectors. Since
> this time randomly we observe on boards between the pin on top of the
> conformal coating a white material growth between the connector pins. We
> are going to investigate the what type of contamination may be on the
> board but if you were going to list most probable causes and corrective
> actions what would they be?
>
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