If your display is partially out, the display panel is broken. If the display does not work at all, then either the main control board or the display board has broken, then they need to be replaced.
If the microwave door does not open, the door opening mechanism has failed. To find the place of breakdown, it is best to give the microwave oven to a service center or go to specialists from Fuse Appliance Repair. I do not advise you to try to open the door with effort. You can damage both the door itself and cause additional damage to the mechanism of its opening.
Every thing, be it an electrical appliance or some kind of mechanism, has its expiry date and resource of work. In our world there is nothing eternal and the magnetron is no exception. The resource of operation of the magnetron directly depends on the mode of its operation. The more intensive the microwave oven, the less the magnetron will serve. In the course of long operation, the magnetron “ages and wears out”, resulting in such a malfunction as the loss of cathode emission, i.e. The cathode region is depleted with time, and it loses its ability to emit electrons into the working region, which causes the magnetron to stop working. The second malfunction that can occur during long operation is a break in the filament. In this case, you can give an example of an ordinary incandescent lamp, no matter how much it would not shine to you, sooner or later, it will still burn out. As a result of the breakage of the filament, approximately the same situation arises as in the first case. The cathode is not heated, hence – there is no emission. These two malfunctions are often encountered in practice, and if we theorize theoretically, we can assume that a third malfunction occurs as a result of a prolonged operation of the furnace – this is a failure of the magnetic system of the magnetron. In the event of a malfunctioning of the magnetic system, the electrons will simply fly from the cathode to the anode, they will not “circulate” along the anode surface and the microwave oscillations in the resonators will not arise. In practice, it was in magnetrons that I did not see this, but it was found in other devices containing permanent magnets. From time or under the influence of external factors, a permanent magnet can lose its properties (demagnetize).
Warning: A microwave oven can store a deadly amount of electricity (up to 5000 volts) in its high-voltage capacitor even after the microwave oven is disconnected from the mains. It is therefore extremely important to replace the electronic components in the microwave oven, only a licensed technical can lock them).
Another very common malfunction of the magnetron is the breakdown of the pass-through capacitors of the magnetron filter. Check it out, the same simple, by the same tester. In the resistance measurement mode, you need to touch the probes of the device with one of the power terminals of the magnetron and its housing. If the device shows “infinity” – the capacitors are in good order (bottom picture). If the device shows any resistance, then one of the capacitors is broken or in a leak. If there are other serviceable capacitors, they can simply be replaced, if not, then it is better to replace the magnetron with a known good.
The small power of the electric motor of constant rotation of the turntable in the microwave oven is not uncommon for these motors, since they wear out with age.
Sometimes the breakdown will be unexpected and the turntable will stop. But sometimes the engine starts to make strange noises, which indicate the impending trouble.
Failure of the exhaust fan.
Like the rotary table, the exhaust fan is powered by a small motor that runs constantly. Sometimes the fan motor and the table are common. The failure of the electric motor of the fan often occurs suddenly, and sometimes they break down gradually, making some strange and unusual sounds in the process of work.
Malfunction of mixer motor.
The mixer in your microwave oven is a small metal blade that continuously rotates, while the oven is running. The purpose of the mixer is to make sure that the microwave energy in the oven is evenly distributed. This helps to prevent uneven cooking or heating food.
As with the exhaust fan and the turntable, the mixer motor breaks down gradually, producing unusual sounds during operation. The impending breakdown of the mixer motor can often be accompanied by a strange grinding noise.
Problems with the magnetron.
Magnetron can be considered the heart of a microwave oven. It generates microwave radiation, which prepares food. This happens by converting electricity into microwave energy of the appropriate frequency.
A good magnetron works almost silently. But as soon as the end of their working life comes to an end, they start to make strange sounds. The noise of a defective magnetron can range from a rather shrill howling to growling or rumbling.
You should know that if the furnace magnetron has already begun to emit these noises, then this is not dangerous. But it is a sure sign of an impending breakdown. Call the wizard as soon as you start to notice these sounds, and he will help you avoid the failure of the microwave oven at an inconvenient time.
There are many reasons why your microwave oven does not turn on, one of which can be a faulty door switch. A door switch, known as a lock switch, signals to other microwave components to start the power supply when the door is closed and stop when the door is opened. For this reason, everything else can appear in working order, but the microwave will not start to heat up. To access the door switch or the lock switch, turn off the microwave oven and remove the cabinet. The switches have terminals designated C for general and NO for normally open. Check each terminal with a multimeter to ensure continuity. If at the time there is, then it means that the switch is working. If there is no circuit, replace the switch. You can also take this opportunity to make sure that the door hooks work correctly.
If your microwave oven does not start and the display is empty and does not respond, the problem may be related to the ceramic fuse. This part protects other microwave components from power fluctuations and leads to a total loss of power when it fails, that is, your microwave oven will not work. To access the ceramic fuse located inside the cabinet next to the power cord, first turn off the microwave oven. Use a multimeter to check the integrity of the fuse. If you are aware of the cause of a fuse failure, such as opening or closing a microwave door, you can also check the door switch to make sure it works. If you do not know the cause of the fuse failure, you can test other microwave parts, such as a magnetron, a high voltage diode, a capacitor and a transformer.
Thermal fuse or cut-out
The problem with a thermal fuse or cutout can be the reason that your microwave oven does not turn on. Thermoswitches, also known as thermal fuses, help to keep the furnace from overheating. When the heat outputs do not work, your microwave oven does not turn on as a precaution so that it does not heat up. To access the thermal switches, first turn off the microwave oven, and then remove the cabinet. After you find the thermal fuse, disconnect its wires from the terminals. Use the multimeter to check for continuity and replace the thermal cutouts if there is no continuity. Take this opportunity to also check if the cooling fan is working, or to cause the microwave to overheat, shutting off the airflow.
Your microwave oven may not start due to a problem with the door latch. Most of the door latches are made of plastic hooks that stick out of the door and lock the door switch when the door is closed, signaling the rest of the controls to turn on the microwave. If the hooks are damaged or do not have tension due to worn springs, the switch will not click, which means that the microwave oven does not turn on. To gain access to the door latch, first unplug the microwave oven from the power source and remove the inner door panel that is held in place with plastic plugs. Inspect the door latch and replace it if it is damaged.
Most microwave ovens have internal lighting that turns on when they are warmed up or when the door is opened. This light is not necessary for microwave operation, but it is much more convenient to use with it. If the bulb in the microwave is burnt out, you can carefully disassemble the microwave and replace the bulb or consult technicians from Fuse Appliance Repair.
This problem begins to manifest itself due to untimely care of the microwave, traces of fat and food accumulate on the walls of the microwave and it starts to spark, all microwaves have a mica plate that is a dielectric, that is, a material through which any radio waves easily pass. For the mica is installed magnetron, with the help of which our food is heated. As a rule, when the microwave begins to spark, then the mica and the magnetron cup are burnt, but there are also cases when the magnetron itself breaks down, so if your microwave sparkled, do not turn it on any more, and replace the mica and Check the magnetron cap.
The paint on the inside of the microwave oven can be chamfered. If the paint is beveled, the inner metal will be opened, resulting in a microwave sparking or blowing. Check the inside of the microwave oven in any places where the paint has broken away. If there are damaged spots, touch them with the microwave oven’s paint.
f the fan of the microwave oven does not work, then you may have a faulty fan motor, try removing the fan motor. Run a multimeter to check the resistance of the windings of the fan motor of the microwave oven, if it is defective, replace it.