The problem of broken pixels is currently widespread among buyers of TVs and computers, it is one of the most common, so it is especially important to notice it at the stage of choice, and if this opportunity is missed, take measures to "cure" the technology.
There are special test images for checking the screen for dead pixels, they are completely filled with some color, so the slightest difference will immediately catch your eye.
Therefore, we recommend downloading this to any convenient medium and ask the seller to test the TV or monitor before buying. However, keep in mind that not every store will agree to this, a refusal can justify the danger of transferring the virus from your device. In this case, it is up to you to decide whether to take risks or not.
IMPORTANT! There are standards according to which a certain number of dead pixels is the norm for a particular technique, so such cases are not classified as defective and cannot be returned and repaired under warranty. Therefore, we recommend that you approach this type of verification with great care.
There are three varieties of this defect:
- white dot on a black background;
- black on white;
- a subpixel problem that gives the pixel one unchanging color.
First you need to understand how undeformed pixels work. Each of them consists of three subpixels of red, green and blue, their combinations among themselves form a huge number of colors and shades. The severity of each of these three is regulated by a transistor that distributes a certain amount of electricity to each unit. Thus, any malfunction of the transistor can lead to the appearance of dead pixels. The following reasons may affect this:
- overheating or hypothermia, leading to the hardening of a subpixel;
- increased humidity, which usually results in white pixels;
- power outages that can lead to transistor defects;
- violation of manufacturing technology;
- long use of the screen to display images in static, increasing the risk of burnout of the transistor. That is why most TVs by default display a dynamic splash screen if the video pauses for a long time;
- any damage of a mechanical nature.
There are three ways to "cure" the screen of a designated problem.
The first one is physical. Take an ordinary cotton swab and gently press down the location of the broken pixel with the TV or monitor turned off. After a while, turn on the device to check, if necessary, repeat the procedure. Using this method, you can “move” a liquid crystal displaced from its place for one reason or another.
ATTENTION! It is suitable only for a small accumulation of dead pixels. If the problem has grown from the point level to the spot level, this method can lead to its growth!
The second way is software. There are specialized utilities (for example, JScreenFix) that work according to the following scheme: they include an animated image consisting of many colors moving at great speed. The program runs for half an hour, then you must repeat the procedure every 4 hours. You may also need a second “course” in the summer, when the problem may reappear due to the heat.
The third way is repair. The problems that lie not in a specific liquid crystal, but in the operation of the transistor, cannot be eliminated on your own, so you only need the help of a specialist.
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