LG Microwave won’t heat up
LG microwave diode
The diode increases the voltage by nearly 5,000 Volts. The magnetron heats food using this high voltage. If the diode fails, the magnetron does not receive enough power to work, and the microwave will not heat. It’s common for diode burnout to be visible. Replace it if you find that the diode was burned out. If the test with a nine-volt multimeter fails, you can also use a nine-volt battery connected in series with the device. The diode must only be able to maintain continuity in one direction when the leads are reversible—warning: The high-voltage cap can store a deadly amount of electricity even after it has been unplugged. Because of the high running voltage and the risk of electric shocks, replacing the electronic parts in a micro is very dangerous. Only a licensed technician should replace the microwave diode.
LG Door Switch
Most microwaves feature three or more door switches. Door switches close the microwave in a specific order to ensure it is closed correctly. If one of the door switches is not working, the microwave won’t start or heat. Use a multimeter and test the switches to determine if they are defective. Replace the switch if it does not work. (Caution: Even after unplugging the microwave, its capacitor can still store thousands of voltages. The risk of electric shock is high when replacing the electronic components within a micro. Door switches should be replaced only by licensed technicians.
LG Electron Microwave Magnetron
The magnetron produces microwave frequency using DC high voltage/high current power. The microwave will not work if the magnetic burns out. The magnetron cannot be repaired. If it’s burned out, the only option is to replace it. (Warning: A microwave oven’s high voltage cap can store a deadly amount of electricity, even when the oven is unplugged. Because of the high running current and the risk of electric shock, replacing the electronic parts in a micro is very dangerous. Only a licensed technician should replace the magnetron.
LG Microwave Thermostat
The microwave will shut off power if it overheats. The voltage may not reach the high-voltage components if the thermostat is open and short. Multimeters can be used to check the thermostat for faults. It must be replaced if there is no continuity and the thermostat cannot be reset.