Washing machine control boards are called modules. These elements are manufactured with thyristor units of different frequencies. In this case, a lot depends on the manufacturer. You should also take into account the functional features of the models. Some modifications are made with a small set of modes, and are simple in design. Modern analogues have a high-quality thyristor unit.
The capacitors of the latest series models are produced with mesh filters. Thus, the control board of the washing machine is reliably protected from network overloads, as well as impulse noise. If necessary, repair the module can be done by hand. However, first of all, it is important to understand the probable causes of the breakdown of the control board.
Causes of board malfunctions
There are the following reasons for part breakage:
- short circuit of the control board;
- burnout of the capacitor;
- breakage of board resistors;
- short circuit of the thyristor control unit;
- burnout of circuit board triggers.
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Complete module replacement
As a rule, replacing a module does not take much time. First of all, to do this, remove the front cover of the washing machine. Further, making repairs with your own hands, experts recommend that you familiarize yourself with the board mounting device. Basically, the element is fixed on plates that are connected to the body of the washing machine. On many models, they are clamped with screws. You will have to use a wrench to remove the plates. The next step is to carefully remove the module and check its status. Before installing a new element on the block, you must know the exact marking of the part. It is important to tighten the screws slowly, and without strong pressure on the key.
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How to change a capacitor?
The condenser of the module at the washing machine acts as a stabilizer. Quite often, it is installed on the unit along with filters. Pass-through modifications are often found in modern models. It is also worth noting that the capacitors of the boards cannot be repaired. If the specified element burns out, you can simply change it. To do this, you will need a similar element, as well as a blowtorch. Quite often, capacitors in washing machines are installed with several filters. As a result, the likelihood of repeated burnout is greatly reduced. It is only necessary to solder the capacitor to the block to the positive electrode. A tester is used to check the resistance of the variable circuit.
Resistor testing
Washing machine boards often burn out due to resistors. Do-it-yourself model repair should start with testing the module. This only requires a tester. On the first order board resistors, the average resistance is 8 ohms. In this case, the overload parameter should not exceed 2 A. The resistors of the second-order boards are tested last.Their overload index is from 3 to 5 A. In this case, the resistance depends on the frequency of the control module. If we consider a simple block, then the above parameter does not exceed 10 ohms. If the resistance is violated, the resistors of the boards can be re-soldered. When repairing the unit, experts recommend replacing the filters.
Repair of the thyristor unit
Repair of the thyristor block of the module is allowed only after checking the capacitors. If everything is in order with them, then you can proceed directly to testing the block elements. The specified part mainly breaks down due to increased overloads from the 220 W network. Also, the unit often fails due to impulse noise. It is quite difficult to make repairs on your own. To do this, you will first have to measure the negative resistance. On first-order diodes, the nominal voltage on average reaches 20 V.
If the power supply is in order, then the output contacts rarely burn out. In order to check them, you need to use a tester. If the matter lies in a burnt out filter of the thyristor unit, then the problem can be resolved fairly quickly. In this case, you must first clean the cathode. The nominal voltage on it reaches an average of 12V. When repairing the thyristor unit, it is important to monitor the status of the ports. It is very easy to damage them, and they are quite expensive on the market. The new filter boards are soldered through the positive contact. After all work has been done, the control board is thoroughly cleaned.
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Checking trigger status
The trigger in washing machines rarely fails. The reasons for the breakdown are most often associated with malfunctions of the capacitor. To verify that the trigger is working, it is important to test the voltage across the output pins. The specified parameter should be within 12 V. Many models have a filter near the trigger. The resistance indicator on it averages 20 ohms.
Replacing the trigger on the control unit takes a long time. First of all, it is important to do the soldering of the output contacts. In this case, it is necessary not to touch the capacitor cathode. After soldering, a new trigger can be installed. The last step is to test the threshold voltage and check the output impedance at the modulator.
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