![]() It is important to remember that some defects do not appear immediately, but only after heating the matrix. Finding defective color subpixels can be facilitated by alternately changing the screen color. To find the white dots, just make the screen dark. Detection of black dots, possibly when applying a white field to the screen. Ordinary magnifying glass will become a reliable assistant in this test. The easiest way is to visually inspect the screen at close range for the presence of a dot that glows in a different color. ![]() ![]() What to do in this case, is it worth it to agree or still try to cope with this work on your own? Now many stores offer a paid service for checking screens for defects. Often, the buyer does not have a computer at hand, so such manipulations in the store is extremely difficult. Testing devices can also be carried out using special programs by connecting the TV to a computer or laptop. Knowing the permissible norms of dead pixels, methods of checking for the presence of such defects, it is not difficult to choose high-quality equipment. For example, the resolution Full HD (1920 x 1080) involves the use of more than two million pixels. The cost of goods depends on their class.Ī picture is formed on the screen by all the pixels of the display. The information in the table indicates that the products of the first class are completely devoid of dead pixels. In order not to get into an unpleasant situation, we recommend that you approach the choice of a TV very responsibly.In particular, it is worth knowing how to check the LCD TV at a point of sale when buying for broken pixels, to get acquainted with certain standards according to which displays are divided into four classes. For the sake of truth, we note that usually the dispute between the store and the buyer does not end in favor of the latter. Often in stores you can observe a picture when a buyer tries to return a newly acquired TV by detecting defects on the screen, in particular, dead pixels. Let's try to figure out how to check the TV before buying, and protect yourself from the acquisition of low-quality equipment. An important place is also taken by checking the device for matrix defects. Thus, choosing a LCD TV, it is not enough to pay attention to its appearance, the presence of numerous functions, ports, connectors. There are times when broken pixels, after some time, disappear on their own. To eliminate this defect, you can use special programs or conduct a series of physical manipulations. ![]() Such a “stuck” object appears on the display in the form of a white (burning) or colored dot. This problem appears in a layer of liquid crystals. The second reason is the subpixel frozen in one position. Some experts consider their “treatment” impossible, while others argue that using a laser it is actually possible to partially return the pixel to its working state. Such defects are most visible on a light background. Subsequent control of these crystals is simply not possible. Dead pixels appear in two layers: liquid crystals and thin-film transistors.Īfter the failure of the transistor controlling the liquid crystals, black ("dead") dots appear, indicating non-functioning cells. ![]()
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