- Causes of
- board faults Complete replacement of the
- module How to change the capacitor?
- Testing of resistors
- Repair of the thyristor unit
- Checking the state of the trigger
Control boards of washing machines are called modules. These elements are made with thyristor blocks of different frequencies. In this case, much depends on the manufacturer. You should also consider the functional features of the models. Some modifications are made with a small set of modes, and on the device are simple. Modern analogues have high-quality thyristor unit.
Condensers for models of the latest series are manufactured with filters of the grid type. 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 control board failure.
Causes of
board malfunctions There are the following causes of part failure:
- control circuit short circuit;
- condenser burnout;
- failure board resistors;
- closing thyristor control unit;
- burnout board triggers.
Complete replacement of the module
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 on their own, experts recommend that you familiarize yourself with the mounting device of the board. Basically, the element is fixed on the plates, which are connected to the body of the washing machine. In many models, they are clamped with screws. To remove the plate, you have to use the key. The next step is to carefully remove the module, and check its status. Before installing a new element on the unit, you must know the exact marking of the part. It is important to fasten screws slowly, and without strong pressure on the key.
Tip:
Read also: The washing machine does not turn on: causes of malfunction.
How to change the capacitor?
The condenser module of the washing machine plays the role of a stabilizer. Quite often it is installed on the unit along with filters. Modifications in modern models are common. It is also worth noting that the capacitors of the boards are not repairable. When a specified element burns out, you can simply change it. To do this, you 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 re-burning is greatly reduced. Solder the capacitor to the unit is necessary only to the positive electrode. A tester is used to test the resistance of a variable circuit.
Testing resistors
Boards for washing machines often burn out due to resistors. Repair of the model with your own hands should begin with testing the module. This requires only a tester. On the resistors of the boards of the first order, the average resistance is 8 ohms. At the same time, the overload parameter should not exceed 2 A. The resistors of the second-order boards are tested last. Their overload rate ranges 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 it has the above parameter does not exceed 10 ohms. If the resistance is disturbed, the board resistors can be soldered. Making repairs to the unit, experts recommend replacing the filters.
Repair of the thyristor unit
Repair of the thyristor unit of the module is allowed to be performed only after checking the capacitors. If everything is all right with them, then you can proceed directly to testing the elements of the block. This part basically breaks due to increased overload from the 220 W network. Also, the unit often fails due to impulse noise. Self repair is quite difficult. To do this, it is necessary first to make a measurement of negative resistance. On the first-order diodes, the nominal voltage averages up to 20 V.
If the power supply is OK, then the output contacts rarely burn out. In order to test them, you need to use a tester. If the case is a burnt out filter of the thyristor unit, then the problem can be resolved pretty quickly. In this case, you must first clean the cathode. Rated voltage on it on average comes to 12V.Making repairs thyristor unit, it is important to monitor the status of ports. It is very easy to damage them, and they are quite expensive on the market. A new filter board is soldered through a positive contact. After all the work has been done, the management board is thoroughly cleaned.
Checking the status of the trigger
The trigger in washing machines fails rarely. Causes of failure are most often associated with failures in the capacitor. To test the functionality of a trigger, it is important to test the voltage at the output contacts. The specified parameter must be within 12 V. In many models, a filter is installed near the trigger. The average resistance on it is 20 ohms.
Replacing the trigger on the control unit takes a lot of time. First of all, it is important to do soldering of the output contacts. It is necessary not to touch the cathode of the capacitor. After soldering, you can install a new trigger. The final step is testing the threshold voltage, and checking the output impedance at the modulator.
Tip:
See also: Repair washing machines with their own hands.
