Actually my oven is a MIDEA brand (whatever no name brand that is) and the problem is with the mains fuse. After I repaired some contacts problem that prevented the oven to start microwaves when I close the door (the contact wasn't turned) now I have a problem with the fuse. It blew up after one day of the initial repair. I have dissasembled the oven, done a quick check and replaced the fuse. I've done some testing, all seemed to be ok, the oven worked properly, no fuse blowing out, no nothing. After some hours, next day when I tried to use the oven the fuse blew again. Once again I've dissasembled the oven, did some checks - all ok, oven working - next day the same :). The fuse blows when I open the door, in the same moment. After I change it I can power on the oven, all works, but after some 15-20hours when I open the door the fuse blows out instantly.
Could anyone help me. I have all the tools and can change components or other stuff, but my field of expertise is laptop and desktop repairs not ovens.
The door latch switches, and monitor switch assembly needs adjusting. With the door open the two latch switches should be normally open,and the monitor switch closed. Opposite way when door is closed. MAKE sure oven is unplugged before testing
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Did you have any power surges in the house? Any thunder storms?? even if you are not using a microwave, but it is plugged in , you see the clock?? That means it is getting power and running the clock so while you may not be cooking in it, it is actually using power to run the clock functions. So, if there was a power surge, it damages a part on the main board called the Low voltage transformer. It takes the 120 volts from the wall and drops it down to the voltages the board needs to operate, sometimes 5,12 24 or maybe 30 volts. If the primnary winding gets damaged from a surge of some sort. it will no longer light up if that small transformer was damaged. That can happen without even blowing the fuse as the small wires in the transformer were never meant to carry the 15 or 20 amps the fuse is rated at. So the transformer goes bad and the unit is dead but no blown fuse. Have to check the primary winding of the low volt transformer to see if it has continuity. If not, will need new main circuit board. Sorry But $$$$$
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The magnetron is shorted, the keypad control board is bad, blowing fuses. If less than 7 years old it has a inverter board that can be trouble, But with the level of work and parts it will easily exceed the cost of a new microwave oven.
It appears like the high voltage capacitor is shorted or the diode connected to the capacitor. You might want to check the monitoring switch as well if the capacitor and diode are good. Click here for more info on how to work around these high voltage devices.
Let me know if you need further assistance.