I've never heard of a window "circuit board", but that doesn't mean there isn't one...
Your problem is certainly centralized in one location where all of the motors would receive their voltage. Considering the exact nature of the problem, it could very well be a problem with a bad circuit board somewhere.
(A bad solder run, a bad capacitor, separated heat sink... who knows...)
Find a Chilton's or Haynes manual for your car. They should have the wiring diagrams.
Find your window switches and your window motors in the schematic and trace where they all meet. That area would be a good bet....
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