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you checked power ,but did you also check the connections at the junction box of the dishwasher ? that little metal box in behind the kickplate ?if there is a bad connection in there it will cause that issue ..also all power goes thru the door latch ,i had one DW where the plunger of the micro switch was all gummed up and hat caused no power also ,so i would check those two out before changing the mother board . with the junction box unscrew the maret connections and rescrew them tight again with equal bare wire on each wire ..
but if that is all ok ,i would go with the board after that