Features of LG control modules

LG washing machines are often placed in second, and sometimes first place, by many craftsmen and my personal acquaintances when they recommend household appliances for purchase. I have a Samsung washing machine at home, and my parents have an LG, the popularity of these other Korean brands is simply off the charts and all other brands from the Bosch, Beko, Hansa, etc. series fall into 3-5 positions in the conditional popularity ranking. It is for these reasons that we decided to include LG modules in the lesson, especially since only this brand has direct drive technology, which we will discuss below. (Ref. At the moment, LG's patent for direct drive has expired and Whirlpool now also has an SMA with direct drive) Module with commutator motor Let's start our consideration with the usual modules designed to control commutator motors. If you compare them with Samsung modules from the previous lesson, you can find a lot of similarities, it’s no wonder, geographically the homeland of both brands is very close, as are the technical solutions that are used in them. (for example, Arcadia control modules, etc. are also assembled and developed at the Korean plant, about which there is a label on each module) Getinax and filling in the compound indicate a relationship in Samsung and LG modules Classically, these modules are powered by a power step-down transformer and then stabilized by linear stabilizers to levels of 12 and 5 volts. A good solution and feature of these modules is to control the blocking using a relay, since the blocking is a frequently broken unit, which leads to failure of both the controls and even the processor, and the relay provides decoupling from this circuit and protects the control system from damage. The weak points, similar to the Samsung, are the contacts of the power relay and the heating element relay; cold soldering and the formation of ring cracks lead to burnouts and loss of contact. Often, during transportation and impact on the selector, the board and tracks crack. Direct drive module. The next stage in the development of technical thought was the use of direct drive. To control it, a more complex electronic system is required. This type of motor is called synchronous, or to be more precise, brushless direct current (BLDC) motor. Another name for this type of drive is valve drive. Transistors are called gates in electronics; they replace the usual mechanical commutator-brush assembly. The power part of the control is similar to the frequency converter of an asynchronous motor, but regulation occurs according to different principles. It is controlled using a 3-phase synchronous PWM signal. For synchronization, a rotor position sensor is used, which is most often a Hall sensor; along with it, sensorless synchronization based on a signal on a free winding can be used. The hall sensor provides information about the position of the rotor and the issuance of control signals at the right time and controls engine speed. The rotation speed depends on the duty cycle, i.e. on the supplied power. On modules, the converter is built on a power semiconductor assembly rather than on discrete elements. Maintainability of LG modules Repairing LG modules is complicated by the fact that they are embedded in a compound, and to replace elements or measure their parameters, you have to clean off the compound, as well as cut through the plastic housing of the module. I don’t recommend removing the module from the case unless absolutely necessary, because getinax is quite fragile; at best, microcracks may appear, at worst, the board may be broken into two or more parts. This may sound crazy to some, but in my practice I have never seen a single module broken in half. The technique I recommend is to localize the problem area, and then make a cut in the body. To make a cut, you can use a knife, a burr with an abrasive disk, a heated spatula, or a soldering iron; each method has both pros and cons, the most important thing is not to damage the tracks and elements on the board. This is especially true for the method with a knife and sawing with an abrasive disc.
Модуль управления стиральной машиной.jpg
Модуль управления стиральной машиной.jpg
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