A broken microwave oven is a serious problem for those who are used to managing their time rationally. Getting the dish out of the refrigerator and putting it in the microwave oven is easy. But here you take out breakfast after warming up, and it is completely cold. After such a discovery, I want to immediately restore the operation of the equipment.
Do-it-yourself LG microwave repair. How to do this, we will describe in detail in the article.
LG microwave oven problems
To understand the causes of the breakdown, it is important to understand the structure of the microwave oven. See picture below:
The principle of operation of the device is simple. The user plugs the microwave oven into a socket, voltage is applied to the transformer windings. There, the voltage force is doubled for rapid heating. The magnetron creates radiation that affects the food and “warms up” it from the inside.
To protect the electronics, the design includes fuses, a protective phase and power relay.
The most common breakdowns of Algy microwaves are:
- Spark during work. The reason is in violation of the enamel, damage to the protection of the magnetron. Further operation of the equipment is prohibited, it is dangerous to health.
- Noise and hum. Cooling fan or transformer problem.
- Problems with launching. If the appliance does not turn on, the network cable, temperature sensor, door lock and microswitch are checked.
- Long heating. The operating time exceeds the set time. Probably, the magnetron will soon fail.
- Pallet lock. In the normal state, the tray rotates so that the food is heated evenly. When rotation does not occur, it is worth checking the engine or its contacts with the pallet.
- Failures in management. Failure of the control board or sticking of the buttons. You will learn more about repairing the touch panel in the article “Buttons on the microwave do not work.”
- No heating. Diagnostics of the magnetron, winding fuses, protective relay is carried out. Sometimes power surges in the network lead to a problem.
Having dealt with the main breakdowns, you can begin to repair.
How to Repair an LG Microwave Oven
To calculate the cause of the problem, it is necessary to dismantle the casing of the device. Of course, there are obvious signs of a malfunction, such as sparking. But you need to understand why it occurs.
Unplug the microwave before starting any work. Please note that self-disassembly of the equipment will void the warranty.
Open the device door. Inspect the internal condition of the camera for damage to the enamel, burn marks.
For diagnosis magnetron operation do the disassembly:
- Take a Phillips screwdriver or screwdriver.
- Remove the six screws that secure the instrument cover.
- Unhook the latches that secure the internal parts.
If you find burning in the area of the magnetron, this may be due to the waveguide. It happens that after prolonged use it heats up and closes to the case. Why is this happening:
- The input voltage exceeds the norm (during surges in the network).
- Defective transformer.
- The microwave oven has not been operated correctly.
How to test the magnetron:
- Remove the device. To do this, disconnect the terminal and unscrew the four screws.
- Attach the probes of the multimeter to the contacts of the magnetron.
- If the resistance on the screen shows zero, then the cause is a short circuit.
- The defective part is replaced with a new one.
Noise and hum. Inspection of the fan and transformer will help to fix the problem. Make sure that the back of the equipment is properly ventilated, move it away from the wall.
A multimeter is also used to diagnose the transformer. It is necessary to measure the resistance on the primary and secondary windings.
- Disconnect the contacts from the windings.
- Attach the probes to the connector or winding contact.
- If one of the windings shows zero, this is a consequence of a short circuit (short circuit).
- In this case, the entire transformer is replaced.
Microwave won’t turn on. Check the voltage at the outlet. Connect another device to it. If it works, inspect the network cable. It should not be bent, melted. If damage is visible, the cable must be replaced.
Make sure the chamber door closes tightly. A broken lock or microswitch causes the control board to not signal to turn on. Because it is not safe to heat up when the door is open. In case of malfunction, a new mechanism is installed.
Tray does not rotate. It also requires disassembly and inspection of the wiring from the engine to the sump. Tighten contacts and connections. If the engine breaks down, the assembly needs to be replaced.
Now you know how to repair the LG microwave oven yourself. Follow our recommendations and do not forget to follow safety precautions.