A few days ago while using convection, this unit (also known as PVM9179SFSS) that is only about 6 months out of warranty (typical..) has just simply turned off and no longer turns on. To be more specific, the display does not turn on and is not responding to controls. After taking it down and disassembling it, I verified with a multimeter that the fuse is fine, and that the power is going into the microwave past the initial small AC supply board. No readily apparent burned parts or anything of the sort.
Next, I checked the thermal fuses - there are 4 of them, for continuity. Three of them were fine, but the fourth, labeled as a 'vent hood thermostat' (50/70) in diagrams, was open. To test, I removed it and shorted the wires leading up to it, but it still won't turn on. I'm not sure if it being open is actually normal at this point.
Any advice on where to look further would really appreciated