Bought pixels on the TV: what it is and how to remove?

In all liquid crystal displays, the appearing picture form pixels. Pixel grid – these are three separate pixels of red, blue and green colors responsible for the full image formation. And for each such subpixel there is its own transistor, it controls it on / off. Bought pixels on TV – The problem with which each consumer can theoretically encounter. And it would be nice to know what it is and how to fix the situation.

What it is?

The liquid crystal display is created technically difficult. Because the problems associated with the bad work of the TV are not always possible to solve independently.

Some popular physics:

  • LCD screens (on which there may be broken pixels) “Ergonomic”, because thanks to them, the TVs have become thinner;
  • Such screens It is better to carry out electricity, as a result, better and video signal;
  • Radiation level in these devices below;
  • The whole outdoor surface of the LCD TV display matrix is ​​divided on small dots, which are called pixels;
  • It is pixels that take on the function of visualization of the change of orientation and the constant movement of liquid crystals under the influence of the electroopol;
  • In the normal state, pixels are not visible, But if they are deformed, it becomes an interference viewing.

Bought pixels on TV are different abnormal pixels that are noticeable. So the man says. In fact, this explanation is not entirely correct.

Directly by bits (or dead) pixels on the screen will be those transistor of which became faulty. These pixels will not shine, they just remain black. These elements are flying out of the matrix mesh. Against white background, such pixels look most noticeable.

Do not confuse broken pixels with hung. Stuck they call elements that are glowed in red, green, blue or white. On a black background they are very noticeable. It happens such “hanging” when subpixel “slows down” in color update.

How many broken pixels allowed?

Most interestingly – The manufacturer does not appreciate the appearance of broken pixels as a production marriage. And if you send them a complaint, they will most likely not satisfy it. More precisely, They will refer to the rules with a permissible number of broken pixels.

Each manufacturer has its own standards for the number of deformed elements. It depends on the location, resolution, diagonal screen. For example, top companies, and this is LG and Samsung, permissible consider no more than 2 black pixels (that is, truly broken) and no more than 5 functioning incorrectly per 1 million points. It means that 4K resolution is represented by 8 million matrix units, that is, the TV may contain no more than 16 defective pixels and 40 battered.

If the TV display detected the excess of this limit, the manufacturer’s company under the warranty period should replace the TV or provide service.

But defective pixels may appear during the operation of the TV at the expiration of the warranty service life, and in this case the manufacturer must not change anything and repair.

Causes of appearance

Reasons why pixel can become deformed, a lot. Of course, in some cases they reduce the impaired production technologies. If the technological process is broken, then the defectiveness of the final process is more than possible. But such cases are usually easy to establish using a technical expertise.

Other reasons for broken pixels:

  • Overheating / TV supercooling – very high and very low temperatures forcing subpixels to harden, and therefore they can no longer move inside liquid crystals;
  • high humidity – Such conditions are dangerous for the LCD substrate, as soon as the moisture enters the matrix, the marked areas are arisen or white points arise;
  • Voltage drops – a failure in the power grid can fail the transistor, because of which the energy entering the RGB-matrix forces the subpixels to gain themselves in a certain position (hind);
  • Screen application for image static content – If the TV shows the same image for a long time, the display transistor can overdo it, and the crystals are “sacrificed” because of this.

    Finally, it is impossible to exclude damage to the matrix during the non-accurant transportation of the TV. And even in the substrate organized durable fixation, sharp mechanical jackets can damage liquid crystals.

    How to check?

    Of course, the monitor check should be carried out during the purchase. You can do it yourself, but in large stores today there is such a service – usually paid. If we talk about visual identification of defects, then Help attentive inspection. Defective matrix pixels can be detected on red, green, blue, black and white backgrounds. Just it is better to download these pictures in advance and reproduce them from the TV you want to buy.

    Important! With a TV, everything is in order, if on one of the backgrounds designated colors fails to determine, see the defective area. If no point is knocked out of the total background, the technique has been tested for “broken” pixels.

    You can and instrumentally check the device for defective pixels.

    • Dead Pixel Tester. This is one of the simplest and most popular utilities for Windows. After it is started, you should set the mode, then just view the screen.

    • InjuredPixels – Other free and easy-to-use application for Windows. You can switch colors with mouse or special arrows.

    • Dead Pixel Buddy – Online diagnostic and treatment service having a set of colors. Works in all browsers, mobiles also load well. It is important not to forget to make a full screen mode.

    • LCD Deadpixel Test – And one more convenient proven online assistant. The color is selected, the window turns out to the full screen and is checked everything according to the same scheme that the programs offer above.

    Basically, the consumer will have to rely on his vision, because if the buyer has problems with this, then you should take someone with you, confident in your own dormitory.

    I want to say another important characteristic of the product – response time pixel. Than this marker is less, the sooner changes the transparency of each pixel without losing the picture quality. Milliseconds serve in this case. Why it is important, it becomes clear when viewing dynamic filmcene. If the response time of pixels is more than 8 ms, you can see the smear of parts. There is a feeling of the appearance of a loop from moving objects.

      Attention! For new TVs with a large diagonal, the response time of pixels must be from 5 ms and below.

      Methods to eliminate the problem

      Black pixels, as already mentioned above, – This is the result of damage to the transistor. Fix it without replacing these components is impossible. And not at home to do it can not, but also in laboratory – difficult. But the color points, true “broken” pixels try to eliminate the most real.

      You can solve the problem in two ways: Software and manual.


      Recovery is possible due to emergency replacement of related points. You can say this: at this time subpixels get a large amount of energy, which allows them to “revive”, repair. Such technology can help restore at least half of the “broken” points, and sometimes all 90%. But in time each time the recovery process takes different times. It is not excluded that the recovered pixel will “stuck” again (it often happens in the heat – under temperature influence). That is, there are cases when the broken pixel is impossible to “cure”.

      We list programs that help to remove “broken” pixels.

      • Undead pixel. The program proposes first to find the deformed pixels by filling the screen, on different backgrounds will be noticeable “defective” elements. When the diagnosis is made, you can be taken directly for “treatment”. At first, it is prescribed to set parameters with the number of squares, then select the size of one square in pixels and set the speed of their sample update. After the start, the flickering squares move on defective places. When the pixel flashes, this is already success. You just need to wait for the “stuck” pixel will disappear. True, if you have to wait more than 10 hours, most likely, specifically this pixel will not restore.

      • JScreenFix. This is a site, not a program, but free and convenient. He restores pixels almost as it does the previous tool. But the parameters will not change during the operation, how it is impossible to work on the computer at this time (if it comes to restoring pixels on the monitor). The service highlights the zone with digital noise, it can be moved to the required segment of the TV.

      • Pixelfixel. This video on the YouTube platform, you need to run overnight. Roller duration – 12 hours. The colors in it are replaced so quickly that a person can elementary can turn the head (there are warnings even about epilepsy attacks). But nothing will happen if you just don’t look at the monitor while the recovery roller is running.

      Each such program, website, roller can be analogues. For Windows, a lot of tools have been developed that allows you to cope with the “bits” pixels.

        You should try those that are understandable in the instructions. If advertising promises to get rid of defective elements in 10 minutes, you should not be kept on such a promise. Not always possible such fast “treatment”, and the initial “diagnosis” decides. Basically, popular programs work due to quick cyclic colors.


        There is also a manual correction method, which involves directly physical impact on the screen. Of course, the risks of injury to the monitor with such a “treatment” are also high, therefore, insecure in its abilities, it is better not even to try to save the TV manually. This method acts not always.

        The principle of manual method is as follows:

        • You must first find a glowing pixel, after which it turns off the TV;
        • A cotton wand or a pencil is taken with an eraser at the tip;
        • Several times very delicately need to be pressed on the scene of the pixel on the screen;
        • wait follows 10 minutes, then turn on the TV and evaluate the result.

        The method works, rather, according to the principle “lucky – not lucky”. And even the disappearance of hung pixels does not guarantee that they will not appear again.

        Some craftsmen decide to combine the program method with manual. Risks remain and in this case. Good news – “broken” pixels sometimes disappear (often, in fact). Bad news – you can’t fix the TV once and for all, insulating it from the appearance of defective elements.

        Many experts assure: If there are few “broken” pixels, they do not interfere with watching TV, it is better not to touch them. The same, by the way, concerns both laptops, computers, phones. If you cannot cope with the problem of hanging pixels, it is not possible to attribute the device to the service center, and the specialists have a “cure” TV toolkit.

          Expert Council: Before buying a TV, you should familiarize yourself with the standards of “broken” pixels per million pieces. They suggest dividing on grade 4. But these classes are not tied to the quality of the equipment. One manufacturer can sell 1 class LCD panel, which is better than three class LCD 4 Class LCD panels. But such a division, or rather, knowledge of the norm allows us to competently refer to the purchase process, clearly evaluate the purchased goods and not spend our own nerves about the warranty / non-warranty cases.

          About how to remove broken pixel, look next.

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