We have a PCB that two traces have shorted and blown a set of traces on the PCBs. The trace width and spacing is correct for 150 V and is not a new design. We recently changed PCB shops. We found some residual moisture about 1/8" square in close proximity of two traces after assembly and after test. The traces were entirely covered with LPI soldermask.
I understand that the moisture should be removed prior to test. My question is shouldn't the soldermask have insulated the two traces from the moisture?
Scott
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