Guide :Microwave Ovens : JVM1490 Convection/Microwave Oven
High voltage surge
Microwave is installed in travel trailer. connected to 240 volts by stupid mistake. now microwave does not work. checked fuse,it is fine , 120 volts to transformer, and from transformer have 8.9 volts to circuit board behind touch pad. i believe the pcb board is most likely my problem,,but looking for other idea's before ording one.