Steve
I have never seen something like that. Looking at your pictures I think there is more than just a soldermask problem:
The copper leads looks like etched as well as the solder joint. Something that's intriguing me is the fact that only some of the joints and leads are damaged. You see this very good on the picture where several joints are seen: The first and the third joint from the left hand side are like etched. The other joints are intact. Also the copper below the soldermask looks liked etched copper. The only acid that I know that etches Tin as well as Copper is Nitric Acid ( HNO3 ). Don't ask me how this could happen to your board. Did you ever do any surface analysis?
Have fun
Guenter
Guenter Grossmann
Swiss Federal Institute for Materials Testing and Research EMPA
Centre for Reliability
8600 Duebendorf
Switzerland
Phone: xx41 1 823 4279
Fax : xx41 1823 4054
mail: [log in to unmask]
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