How to check the screen for dead pixels

UndeadPixel will fit most

Go to the official website and download the program installer. I recommend the installation version, not the portable one.

In the main window of the program, it is suggested to start finding dead pixels by filling the screen with solid colors: red, lime, blue, white, black and yellow. Different broken pixels will show up on different backgrounds. If you already know where your pixels are, then immediately proceed to restore.

UDPixel works like this: a square appears in which colors change quickly, i.e. there the pixel recovery aLGorithm works, and we need to move this square to the problematic place of the screen. In the “Undead pixel” section, you need to set the parameters:

  • Flash windows. the number of squares, i.e. how many problem areas are you going to treat at the same time
  • Flash size. the size of one square in 1×1 or 5×5 pixels. Since it is very difficult to set a 1×1 square exactly 1 pixel, then a 5×5 area is suitable to restore even one pixel.
  • Flash interval. pixel refresh rate by aLGorithm. The shorter the time, the faster the speed. Maximum speed at 3 ms.

Click Start and move the flickering square (s) to the defective spots, watch the video below. When the pixel starts blinking, then this is already an application for victory, just leave it for a longer time. If everything is unchanged, then select the maximum speed and wait until the pixel disappears. In worst cases it can take 10 hours, there is no point in waiting any longer.

The peculiarity of UDPixel is that during pixel recovery, you can continue to work if the squares are not large and do not interfere.

Dead pixel recovery software

There is no need to talk about high-tech methods used only in laboratories. Is it possible, in principle, to get rid of multi-colored dots at home? Yes it is possible! And I was convinced of this myself. There are two ways to eliminate dead pixels. software and mechanical.

The restoration is carried out by quickly changing the colors of adjacent pixels. Thanks to this process, a large amount of energy is supplied to the subpixels and they come to life. This technology promises to recover from 55% to 90% of “stuck pixels”. True, each case may take a different amount of time, you will have to experiment if you cannot remove the damaged pixels with a raid. Experiments mean changing the speed of changing colors and running the program.

The recovered pixel may get stuck again after a while, especially in hot weather. Then the treatment process will need to be repeated. In some cases, such a pixel cannot be completely cured.

Recovering dead pixels on screens

Summer has begun, heat and new fun. I have a one-room apartment and, think for yourself, I decided to put a second computer in the kitchen with a 19-inch TFT monitor! And what does summer have to do with broken pixels? And here’s what. 36 degrees outside, the stove, oven and high humidity did their dirty work. a couple of dead pixels appeared on the monitor.

Dead pixels are constantly glowing or vice versa. non-working dots or parts of dots (subpixels) on the monitor. If the pixel does not work at all, then it always looks black and is noticeable only in white and light colors. This is the most harmless type of dead pixels, but it is practically impossible to treat.

The most common broken subpixels are when a bright red, blue, green, yellow, turquoise or magenta dot is constantly lit. They are also called “stuck” pixels (stuck pixels). If such a pixel comes out in a conspicuous place, it is very annoying, especially the red # 128578; If all three subpixels are buggy, then a white dot will glow on the screen.

By the way, defective pixels can either appear or disappear by themselves. On my main monitor from the purchase itself, there were three multi-colored dots in the middle of the screen. When buying, I either did not notice them, or they appeared already at home, I do not know. But I did not bother on this score, because they were absolutely invisible to the eye, if not peered. For 4 years of working with this monitor, I never noticed them, although they were in the middle of the screen.

I think this is due to the fact that my monitor is on the MVA matrix, and not on the common TN. Probably, the specificity of the matrix is ​​such that small defects are not noticeable. So, I recently decided to check if these pixels can be removed in a new way. Began to check. but they are not! All have gone somewhere in formation # 128578;

JScreenFix for browser

This is not a program, but just a website, a free service on the Internet. Thanks to this, JScreenFix can be run on any device with the Internet: computer, laptop, tablet, MacBook or LCD panel.

Scroll down the page and click the Launch JScreenFix button. The JScreenFix script restores dead pixels SIMilarly to UDPixel, only without the ability to change the parameters, and it will not work at this time to work at the computer.

You need to move the iridescent square to the problematic pixels, and if they are outside the browser window, then switch to full screen mode by clicking the green button. Watch the video of how Undead Pixel and JScreenFix work:

What pixel defects are there

Any abnormal pixels visible against the general background are called broken, but this is not entirely correct. Really broken or dead pixels are only those in which the transistor has failed. They do not glow with any color and just remain black, falling out of the matrix grid. Clearly visible on a white background.

Left and right pixels are frozen, in the center. broken /

There are also frozen or stuck pixels. these are red, green, blue or white dots that are clearly visible on a black background. They occur when subpixels freeze when updating color.

What are dead pixels

In all LCDs, an image is formed from a grid of pixels. They are made up of three separate subpixels in red, green and blue, which are responsible for full color image formation. Each subpixel has a transistor that controls it on and off.

It looks like a broken pixel on the screen /

Even the matrix of a conventional HD monitor contains over 6 million subpixels, while in 4K displays their number reaches 37 million. With such a huge number, some of the transistors can malfunction. Then certain subpixels remain on or, conversely, off.

How many dead pixels are allowed

It seems logical to replace a computer monitor or TV with dead pixels, but manufacturers do not consider the latter to be a factory defect. When you contact the service with a SIMilar complaint, you will most likely be denied service.

Dell Dead Pixel Policy /

Different suppliers have their own standards for the number of defective pixels, depending on their location, resolution and display diagonal. So, LG considers up to 10 stuck and 3 dead pixels on 20-inch screens to be the norm. Samsung has 7 pixel bits for monitors, while Dell has 1-6 stuck and 6-13 bit pixels, depending on the display line.

Programming method

The method consists in the cyclic output of rapidly changing images, which, due to frequent color changes, increase the chance of returning the hung pixels to the ability to switch again.

There are many options for implementing this method through utilities, online services, and even YouTube videos. They can be used on a computer as well as on a TV when connecting a PC with an HDMI cable.

  • Bad Pixel is a professional paid utility for Windows, the creators of which promise to remove defective pixels in just 10 minutes.
  • DeadPix is ​​a universal program for Windows and Android that helps you find and then fix problem pixels using color cycling.
  • PixelHealer is another utility for Windows. Eliminates stuck pixels with fast flickering RGB colors.
  • JScreenFix is ​​an online service to run on computer, TV and mobile devices. Outputs an area with digital noise that can be moved to the desired area of ​​the screen.
  • PixelFixel is a 12-hour YouTube video that is suggested to run and leave overnight. Attention! The colors in the video change at a very high rate and can cause an epileptic seizure. Do not look at the screen, but rather turn it to the side.

How to check the display

You can visually determine the absence of defective pixels upon close examination on a solid white, black, red, green and blue background. To do this, you need to download such pictures to a USB flash drive and play them on the device you like. If none of the dots are out of the general color, then everything is in order with the screen.

Another option is to use special software if you can run it. In fact, these are the same color pictures, but in a more convenient format for applications or online services.

  • Dead Pixel Tester is a SIMple open source utility for Windows. After starting, you need to select the mode and carefully look at the screen.
  • InjuredPixels is another free Windows app. Colors are switched by mouse or using arrows.
  • Dead Pixel Buddy is an online color checker tool. Works in any browser, including mobile ones. Don’t forget to enable full screen mode.
  • LCD DeadPixel Test is another online service. Choose a color, expand the window to full screen and check.

How to remove dead pixels

Since black pixels are the result of damage to the transistor, they cannot be repaired without replacing these components. And this is almost unrealistic even in laboratory conditions. The situation is different with colored dots, which appear due to freezing subpixels. You can try to remove them.

How to check a monitor or TV for dead pixels and get rid of the problem

You will need a free app, a Q-tip, and a little patience.

Manual method

Another way is to physically influence the screen. A little pressure helps to clear up stuck pixels and get them back into working order. The method does not work in all cases, but you can try.

  • Find the glowing pixel and unplug your monitor or TV.
  • Take a cotton swab or pencil eraser.
  • Gently press the display in the area of ​​the frozen pixel several times.
  • Wait a few minutes, turn on the monitor and check the result.

Keep in mind that even if the frozen pixels are gone, they may reappear. There is also a possibility that after the described manipulations new defective pixels will appear.

If there are few colored dots and they do not really interfere with work, it is better not to pay attention to them and leave everything as it is.

What tests are worth doing and what to look for

Since it is possible to fully test the monitor for operability only at home (after all, it will take a lot of time), you will need to continue testing immediately after connecting the screen to the computer. Explore the options for managing settings, read the list of specifications declared by the manufacturer, and highlight the most important: color rendition, contrast, sharpness, etc. It is these parameters that are subject to testing.


Banding. This is a defect on liquid crystal monitors in the form of vertical stripes with a fuzzy border. Banding is also called a stepped gradient or dirty display effect. There may be several reasons for such damage: pressure inside the matrix, factory defects of the matrix, backlight defects, dust penetration between the matrix layers.

You can check the monitor for banding using the same tests as for dead pixels. If a monochrome background is displayed evenly with no vertical stripes, your monitor is working. It is impossible to cure the screen in case of banding. There is an option for external correction through the gamma correction setting, but this is not a solution to the problem, but only its masking.

Geometry and meshes

The geometry and grids of the monitor should be checked to ensure that screen distortion is present or not. To check the geometry, use the Nokia monitor test program, but if you cannot download it, open an image where the background will be evenly divided by contrasting lines. Attach an A4 sheet to the monitor and see if all the lines are straight. If the lines are convex, there is screen distortion.

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Also check the monitor for image clipping. If the settings are incorrect, the display does not show all the image that comes from the graphics card, some pixels are not reproduced. Run the test on monteon or Nokia monitor test.

How to check your monitor: dead pixels

Pixel. it is the smallest part of the display, a point on the monitor that can glow in any color depending on the picture being reproduced. When this point begins to constantly take on one color (black, white, blue, green, etc.) without changing, it is called a broken pixel. One such particle does not matter, you can easily work with it at the computer. However, if there are more of them, it is distracting and annoying, because you will not be able to see the full picture.

There are several types of dead pixels:

white point on a dark background;

black point on a white background;

It is very difficult to notice such a defect during a regular inspection of the monitor, therefore special programs are used to identify dead pixels. One of the most common is Dead Pixel Tester. You need to download it, unzip it, run it. After that, a plate with the name Select color will appear, in which there are about 16 different colors to choose from. Sequentially choose each of the shades and carefully look at the monitor, which will be completely painted in the selected color. If there is a broken pixel, it will manifest itself in some of the shades, if not, then the screen will be evenly colored.

You can try to remove broken dots using utilities (JScreenFix, Bad Crystal, etc.). A positive result can be obtained in most cases, however, there are breakdowns when a dead pixel cannot be healed.

Color rendering

A monitor with the correct color reproduction reproduces a picture that has a realistic display. If the color rendition is distorted, then during processing the same photo on the screen and in the printed form will have different shades. Incorrect rendering of shades interferes with the work of not only professional retouchers and photographers, but also amateurs who change the pictures in Photoshop for themselves. Therefore, when buying a monitor, you need to check the correct color reproduction.

There are several ways to make sure that the screen reproduces shades correctly. There are many pictures with multi-colored, gray stripes or numbers. Before starting the test, it is worth reading the information on how the image should be displayed on a working monitor. For example, in the 4: 4: 4 test on a screen with good color rendering, the inscription “4: 4: 4” should be clearly visible and “4: 2: 2” should be slightly visible.

How to check the monitor upon purchase

inspect the monitor and cables for visible mechanical damage;

look at the turned on monitor from different sides to determine the viewing angles;

turn on the flashlight on your smartphone and point it at the screen to check the glare;

listen to the working monitor, it should not give out strange sounds (buzzing, loud noises, etc.).

It is worth remembering that this is a superficial check, a more thorough research can be done at home after connecting the monitor to a computer.

Monitor check: highlights

Highlights are very common on both IPS and TN matrices. It is difficult to notice this defect in bright light in the room. If, when viewing photos or pictures with a dark background, you see white spots on the screen, these are flashes. They become noticeable in medium room lighting or in the dark. Therefore, it is better to inspect the purchase for the presence of light in the evening. The main reason for the appearance of such a defect is the tight fit of the matrix to the backlight, therefore it will not be possible to fix this with the help of special software.


Due to sharpness, a clear border appears between light and dark areas, if the sharpness is insufficient, then the image will appear blurry. That is, at a low level of definition, the letters on the screen will blur. If such parameters as color rendition and contrast have a certain level when the picture is perfect, then the most appropriate level of sharpness depends on many unstable factors: the distance of the screen from the eyes, the size of the screen, etc. Therefore, setting the ideal level of sharpness for all occasions will not work; it will have to be adjusted from time to time.

To check the sharpness on the monitor, you can use the monteon utility or download a special picture, which shows many medium-sized squares with a large gray circle in the middle. If small patterns in these squares are clearly visible, then the level of sharpness on the monitor is good, if they merge into a solid gray color, you need to adjust the resolution settings.


Checking gradients can help you determine the display quality of your monitor tones. This is important for conveying a realistic picture when watching movies or when working with video, photos. To find out whether the monitor reproduces colors correctly, you can use the monteon program. The test is a screen template with a smooth color gradient. You need to expand the picture to full screen and look at it from different angles. If the color transitions are displayed smoothly, without streaks or abrupt color changes, this is a good monitor.

There is also a grayscale test. This is a picture with a smooth transition from black to white. The more shades of gray without streaks the screen can display, the better the picture quality.

Some monitors with incorrect color reproduction and incorrect gradient can be adjusted. To do this, just use the image settings. Specialists who are engaged in retouching should either seek help from a computer technician or purchase a special device. calibrator.

Before the purchase

If the resolution is obtained, you can choose one of the options for how to check the monitor for dead pixels:

  • visual inspection is an unreliable method, since it is difficult to determine “by eye” the existence of non-working components. If other methods are not available, it is recommended to bring a magnifying glass with you to help you better see every inch of the display;
  • loading of contrasting monochromatic pictures from a previously prepared flash drive. The method quickly identifies such flaws, if they exist, they will certainly appear;
  • application of verification software developments. Unmistakably indicate location and breakdown status.

Checking the monitor for dead pixels using the program can be done while at home or in the office. Even displays of the highest category often acquire such shortcomings over time, although before that they functioned without complaints. There are tons of tools on the web that you can use for free. These include:

  • DeadPixelTester. checks without installation;
  • Is My Lcd Ok. launched with the function keys F;
  • Monteon. a resource without an installation file in an online format;
  • VanityMonitorTest. do not need to download, but you need a flash installer.

Which case is not guaranteed

If a non-working or stuck element is found on a new device under warranty, this does not mean that it will be accepted for exchange or refunded. ISO13406-2 standard defines the minimum threshold for damaged dot formations, depending on the display class.

How many dead pixels are allowed: table

To understand how effective treatment will be, it is important to understand the severity of the problem:

  • 1st. a luminous snow-white point, easily detected on a dark background, it is possible to restore.
  • 2nd. extinct pix, visible in the shades of the light spectrum. “Recovery” is impossible.
  • 3rd. the “hovering” particle is highlighted in a varied palette, from blue to poisonous red. but there is a chance to use it.


There are many software solutions used to activate a stuck pixel. Among the assortment, the most popular will be:

  • Bad Crystal is shareware with a 30-day trial mode. Although the properties are limited, there is enough functionality to fix errors, which is what is needed in the current situation. And if you use the old modification and remove the darkening of the active program window, you will be able to use the full potential. Suitable for smartphones, TVs or consoles too.
  • JScreenFix. the application is launched through Java, which should be taken care of in advance. It detects damaged points for free, but will require payment for activation. The well-being of the user’s own technique and the user’s nerves is much more important than the cost of paying for the matrix adjustment.

What is a dead pixel on the monitor

This is a bright, or, conversely, non-illuminating point, which becomes visible when the spectral background changes. By the way, not only whole segments are damaged, but also their components, in which case they glow in red and in a different color. They appear

  • for various reasons, the fundamental ones are:
  • physical influence. strong pressing on the screen, hit or other force damage;
  • unfavorable environment. high humidity, heat, sudden temperature changes;
  • fatty fumes and other conditions unusual for technology.

How to check the monitor for dead pixels

This procedure is easy to perform at home or contact a master. Since the process does not require special knowledge in computer technology, you should not spend money on a service, it is easy to identify a defect yourself.

Checking the monitor for dead pixels: 2 ways to check it yourself

The monitor is an indispensable attribute of the computer user. Buying expensive equipment, everyone wants to get a durable tool with clear graphics and fine detail.

However, there are frustrations. incomprehensible points that do not respond to changes in screen color and are annoying. What to do when a defect is found and is it possible to return the display if a warranty card has been issued. the answers are set out below.

How to remove a dead pixel on the monitor

Before proceeding to troubleshoot the error, it is important to understand why micro-squares fall out of order. A pixel is the smallest particle of red, blue and green colors. From these segments, graphics are formed that cover the entire spectrum.

The illuminated components operate on a transistor component that controls the color rendering process. If the component breaks down, the segment goes out and gets black on the screen. Such a pixel cannot be restored in any way. Consoles that it is barely noticeable and, in principle, not annoying.

If the point is white or another color. not all is lost.

Manual way

In the case when it is not possible to use utilities, it is worth trying to act mechanically. Recommended methods include:

  • circular movements of a massaging nature to the area of ​​the point. To do this, the monitor is turned off, and to find the right place, the area is marked with an erasable marker. Be sure to use a soft tool, such as a cotton swab;
  • disconnecting the monitor from the mains for 5-6 days in order to remove static and accumulated voltage from the transistors. Such a reboot will help to activate the performance of the stuck subpixel.

Broken pixels appear on both new and long-running monitors. They deteriorate singly and in groups, creating squares, lines and other geometry. You can identify the malfunction yourself if you use the methods mentioned in the article, and you can get rid of only two of the three types of points. It is highly likely that the problem may return over time, and it is not a fact that next time it will be possible to fix it in the same way.

To make the purchase of a monitor a joy, it should be tested immediately. This is the interest of the client himself. Factory and current defects in the work of pixels do not always fall under the guaranteed return, since the manufacturer has the right to refer to the current threshold for the minimum value of damaged particles.

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Programs for checking pixels on the monitor

Let’s consider several applications, since they all work according to the same principle.

[note] Among all, there are such programs as: IsMyLcdOk and Dead Pixel Tester. They are lightweight but effective because they allow you to test an area of ​​the taskbar. [/ note]

I have a monitor that contains more than 10 dead pixels and they are all at the very bottom of the monitor. They are practically invisible against the background of the panel, but against a dark background they are striking. Thus, you can be cheated by unscrupulous sellers, it is better to use one of the programs.

The program for broken pixels on the IsMyLcdOk monitor is extremely easy to use, you need:

  • Download the utility;
  • No installation required, just run and you will have a hotkey menu;
  • By pressing from 1 to 0 you will see color and gradient changes all over the screen. There are also additional swap icons that can be used by pressing F2 to F5. Exit to the main window through F1.

Another version of DPT, slightly more convenient and functional than the previous program. To use it you need:

  • Download DPT from;
  • Run the utility and you can change colors in the “Pattern” drop-down list. It is very convenient to do this by SIMply scrolling the mouse. You can also do auto color change using a timer;
  • It is also possible to customize the color scheme. A distinctive feature is the presence of the “Exerciser” item, which creates a small square with a changing color. A good tool if it is difficult to determine if there are dead pixels (it can be moved).

Checking the monitor for dead pixels

The monitor is practically the only segment of the computer with which a person interacts and sees the result of the entire system. Since a monitor is a mirror of the soul of a computer and its performance, a lot depends on the screen and its integrity.

One of the few enemies of modern monitors is the presence of dead pixels, which diminish the enjoyment of using it. A pixel is the smallest part of the display that displays a picture. New monitors include millions of pixel data. A broken pixel is one that is not capable of rendering color correctly.

There is a variety of dead pixels, depending on the type of fault:

  • Constantly burning pixels;
  • Always not working (black);
  • Pixels that are not capable of transmitting RGB colors seem to be stuck in one position, usually red, green or blue;
  • Defect of a group of pixels, viewed in a 5×5 square.

Depending on the severity of the problem, pixels may be completely inoperative or SIMply have a laggy color that does not change.

It should also be noted that there is some opportunity to fix the problem of dead pixels, but it is better not to bring it to this, although if the malfunction appeared during operation, then at the end there will be a way to fix the problem.

How to check the monitor for dead pixels?

There are many programs that can help you test your monitor for dead pixels. The principle of their operation is the same, by filling the monitor with a certain color or gradient, also with a group of colors, you can more easily see a non-working pixel. This way, you can fill the display with a single color, making it much easier to find different pixels.

The main difference in this matter is the way the program works. there are websites that can help you diagnose, but you can download the standalone application client.

Monitor Test Sites

One of the representatives of this niche is the site It provides an opportunity to test the screen of not only a computer monitor, but also a mobile device.

The main advantage of the site is that there is no need to download the program to your computer, you need:

  • Follow the link;
  • Click “Start”;
  • As soon as the program starts, you will see 7 color bars. Also, with the help of a kind of slideshow, at the bottom of the page, you can change colors (small dots) or press the arrows to the side;
  • You can also use the drop-down menu to select gradient, shimmer, sharpness, etc. All pictures are aimed at identifying dead pixels and also at determining the color quality of the monitor. All shades of colors must be clearly visible.

The main disadvantage of this kind of sites is the inability to check the lower part of the monitor, which is highlighted under the menu.

Another niche representative is the well-known site He also absorbed a wide range of possible color images, which help to identify a mismatching color or no transmission at all.

To start the test, click on the “HTML windows” button, after which a check will be made for monitor pixels. The active menu is at the top and it pops up, that is, it appears on hover. Here you will find a wide range of standard gradients and SIMple colors, it is also possible to create your own gradient.

You should also be careful, because the problem with the pixel is not always obvious, sometimes a single RGB color channel is blocked, which does not allow the pixel to change its hue.

Dead Pixel Removal Program

There is a special utility that can help with this problem, it is called Bad Crystal. The main function is reduced to frequent color changes, which can break through a stagnant pixel and return it to operation.

There is no guarantee that this will help, the chance is 50 to 50. You can set the number of color changes by setting the pace of the program. You just need to drag the active window of the Bad Crystal program to the problem area and wait for the result, this may take time.

It is worth noting that such a high intensity can have a negative result, so always monitor the actions of the program so that new dead pixels do not appear.

If your dead pixels do not work at all, then the utility will not help you, it is applicable for hung elements.

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Check for dead pixels

What dead pixels look like

This kind of violation might look like this.

  • Some pixels on the screen remain dark when you turn on your monitor or TV. They are called “dead” and look like blackheads.
  • Some pixels after turning off the device remain working and continue to “burn” on a black screen.
  • Some pixels are classified as stuck. They are the hardest to spot. They become visible only when their color is clearly inconsistent with the check table.

Checking for dead pixels is necessary if the screen detects several defects in one of the areas. In some cases, the defects are so noticeable that the size of the “broken” area is 10 points in length and 10 in width. Sometimes “broken” pixels are lined up horizontally or vertically and form noticeable stripes.

How to check the screen for dead pixels visually

Setting a standard color grid on the screen is a test of dead pixels, or rather stuck pixels. The test is a grid of squares, stripes, or a specially designed drawing. Any test contains five primary colors that help you find stuck pixels. Working with the checker program will help you determine if the dead pixels are dead or stuck. If the “stuck” pixels are to be restored, the “dead” ones cannot be restored.

If the TV is checked using software, then it must be connected to the computer’s processor. Also, the test can be run using a regular flash drive. Smart TV can be connected to the Internet via Wi-Fi. There are special online services for this. But you can download test utilities to your computer. If the test is carried out independently, then tests can be recorded on a USB flash drive to check the sound of the device or built-in functions. Among the software that offers colors for checking dead pixels are:

  • Dead Pixel Tester,
  • IsMyLcdOk.

The first program is one of the most beloved and demanded.

Before checking for broken points, you need to run an uninstalled application. The Pettern section allows you to select the desired mode and check the colors using the Color Selector option. Changing the test mode is done by selecting the Auto Color Cycle option. This program helps you quickly find stuck points. The Exerciser option can be used to test different areas of the screen. A dedicated dynamic area allows you to thoroughly examine any area of ​​the screen.

The second program helps to diagnose the monitor matrix. It does not require pre-installation. The program has a special training option that appears on the screen after the program is downloaded.

Testing is carried out using the F2,3,4,5 keys. The program displays:

  • painted areas,
  • rectangles,
  • vertical or horizontal sections.

All programs help to flash pixels with several standard colors.

Warranty service

  • keep the production of screens at the same levels and produce products in the same volumes without increasing prices,
  • buyers will use equipment that has a certain percentage of dead pixels (these cases are not covered by the warranty).

When a dead pixel test is needed

ISO13406-2 standards state that each monitor may have a certain number of faulty dots upon sale.

Different manufacturers have different standards for the presence of dead pixels, depending on:

  • how are they located,
  • what is the resolution of the monitor
  • or what is the diagonal of the display.

For example, LG has 10 stuck pixels and 3 dead pixels on a 20-inch screen.

Samsung’s guidelines call for 7 dead spots, while Dell has 6 stuck and 13 dead spots, depending on which display the malfunction was found on.

Most typical brands of monitors or screens correspond to the second class. They also need to be checked for dead pixels. The check should reveal no more than 5 incorrectly working pixels.

The class of a product affects its price. For example, monitors from the same manufacturer, but having a different class, may differ in cost several times.

How to check for dead pixels online

If the download mode on your computer is limited, you will not be able to download and run the program. Then you can use the online monitor checking services. There are many testing sites out there. Among them stand out:

  • Monteon,
  • Vanity monitor test.

With the first service, you can carry out seven types of checks. To start a test, you need to press the button and stop choosing one of the test types. The check is carried out using a looped video. It helps to detect stuck points and control their refresh rate on the monitor.

The second program helps to quickly detect image defects. To use it, you must have a browser that supports the Adobe Flash Player. The program allows you to select the appropriate test modes. This resource is good because it allows you to “catch” dead pixels not only on a computer monitor or TV screen, but also on a tablet, laptop or smartphone.

  • 1 What dead pixels look like
  • 2 When a dead pixel test is needed
  • 3 Warranty service
  • 4 How to check the screen for dead pixels visually
  • 5 How to check for dead pixels online
  • 6 How to recover dead pixels yourself

One of the most annoying drawbacks of monitors or LCD TVs is the appearance of dead pixels. Pixel. the smallest rectangular element used to transmit an image to the screen.

The problem manifests itself in the form of dots, the color of which does not match the image. The reason for the violation lies in the malfunction of the matrix or its damage.

Each pixel has three subpixels:

  • green,
  • red
  • and blue.
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This allows the display to distinguish between millions of tones and their shades. Molecules of LCD monitors exist like any molecules in a liquid substance. they are constantly moving. But the crystal orientation is constant. Only the electric field changes the pixel orientation. The crystal plays the role of a lens that can change polarization under the influence of a light wave. The matrix of a standard monitor carries about 6 million subpixels. In 4K displays, this figure can be equal to thirty-seven million. A huge number of elements cannot work without failures.

How to recover dead pixels yourself

  • Breakdown of the control transistor. In this case, “broken” pixels are removed from the monitor screen only with the help of a laser.
  • Hanging subpixels. This breakdown is eliminated using special software. Freezes are eliminated using the Bad Crystal program.
  • Pixel error. It can be fixed using the UndeadPixel utility. Dealing with errors is done by using a special area that can be placed over the defect and constantly changes color. Running the program for several hours allows you to eliminate the malfunction. This program is not suitable for dead pixel recovery.

EIZO Test Monitor software can help you eliminate pixel errors on any device. It includes 24 tests. This makes it possible to quickly identify faults anywhere on the monitor. Restoration of violations is carried out according to eight scenarios. The pixel will not only be set, but will also be calibrated for contrast and brightness. The program helps the user to change the settings.

There are a number of other programs that allow you to remove defects from the screen.

  • Bad Pixel is a professional paid service that helps save equipment owners from problems in 10 minutes.
  • DeadPix. universal program suitable for both Windows and Android. It makes it possible to detect and then correct the work of stuck pixels using a cyclic color change.
  • PixelHealer is a Windows utility. It helps correct stuck pixels by quickly changing and flickering different colors.
  • JScreenFix is ​​an online service. It is suitable for working with computer, tablet, phone and any other device. It can only detect faulty points. This is done by moving the study area to the desired area of ​​the monitor.

The Internet resource YouTube has also created its own program to restore the normal operation of points. This is a PixelFixel service that allows you to restore points in 12 hours. It is recommended to turn it on and leave it to work overnight. The high speed of changing the image is not suitable for a person with normal vision. Therefore, while the program is running, it is better to turn the monitor to the wall.

check, screen, dead, pixels

In addition to using special software, pixel restoration can be performed manually. But this method is only suitable for “stuck” or “hot” pixels. You need to take an ordinary cotton swab and gently press the black points of the screen with it. Then you need to wait 10-15 minutes. After this time, the “hot” pixel can work normally, and the stuck one can come into balance with the rest of the points. But this method of restoration can lead to damage to the matrix. If you press the cotton swab too hard, then neighboring pixels will also die and the equipment cannot be exchanged or returned.

Online monitor test. Color range

Evaluation of color quality when displaying smooth gradients of various tones. 9 different modes available.


Test of real matrix response speed. 6 test options available.


Checking the uniformity of the backlight of the monitor lamps and checking the dead pixels. Fill your monitor screen with five different colors.

1: 1 pixelmapping

A streak test, called moire.

Checking the readability and blurring of text on the monitor. You can choose both the color of the text itself and the background on which it is located.

Among other things, Online Monitor Test will be useful for you if you are working on several monitors at once. Using the “Input Lag Html (Exe)” test, you can determine if there is a delay between them in the output of the supplied signal.

  • 3 online PDF text editing services
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  • Parasite. auto-posting service on Instagram

It is convenient to check on Monteon

Hello! I was interested in “Trailing”. I have a regular laptop “SONY waio vpcf11r”, a TFT monitor with a resolution of 1920 x 1080 pixels, with a maximum frequency of 60HZ. Therefore, we consider (1 minute is equal to 1000 milliseconds): 1000 divided by 60 hertz = 16 whole milliseconds to display one frame per second. It turns out that the response time of the matrix (in my laptop) cannot be less than 16 milliseconds. By running the Trailing test in this online service and choosing the second speed, a small trail is already formed behind the moving square. Therefore, it is not clear in the first place: Why are there so many speeds in this online service (I pressed plus and got to 150 and this was not the limit), because even at the second speed there is already a small train? And it is not clear what the response time is this or that speed, that is, for example, having chosen the first speed, the square goes slowly, evenly and without a loop and, accordingly, the question: what is this response time? The second speed corresponds to what response time? So. as my monitor has a response time of 16 milliseconds, then why is there a loop at the second speed?!

Sergei, unfortunately, I cannot answer anything worthwhile to your question. I looked at the service help. there are no detailed descriptions about Trailing.

Thank you for responding! And, in principle, I am not very worried about the response time of the monitor matrix, because knowing the screen refresh rate (for example 60Hz), I understand that when watching a video with a frequency of 60fps, they (the screen refresh rate and the frame rate per second) will coincide so that the video will play smoothly. Good luck to you!

Yes, Sergei, you shouldn’t “drive” on this score. At first I also tested different indicators, etc. And then I just realized: if I myself feel comfortable working at the monitor, then I don’t care about the results of different tests, which for the most part are purely synthetic)

I don’t understand anything. how to really determine the response time of the matrix. Well, the square is running, and what about what? Tell me a?

By the running square on the screen, you can visually determine the presence of loops due to the low response time of the matrix. You certainly cannot determine the exact number. over, many manufacturers deliberately underestimate this parameter in the characteristics of monitors, for example, instead of real 8ms they write 4ms, because it is impossible to check it. Only if with special devices, which of course ordinary users do not have.

Clear. What about TFT Monitor software? According to its measurements, the result is shown in 17 ms.
Can trust? I can’t choose a monitor, I have a laptop all the time, but then I decided to make a hospital for myself and suddenly such a brain work)). With a laptop monitor, everything is SIMple as it is. it is. And then the response time, type of matrix, connectors, etc. If I have lived with this response time all the time, then 18 ms won’t surprise me too much? I choose between these monitors BENQ GW2270 21.5 ″ and BENQ GW2270 21.5 ″. Their characteristics indicate the response time: from white to black. 18 ms, from gray to gray. 5 ms. VA matrix. Be kind Sergey, give an answer.

Denis, by and large, the response time of the matrix should not bother you much if you do not play computer games. Mostly because of this, everyone tends to buy monitors with a response time of 8ms and below.
In your case, I would pay more attention to the type of matrix (IPS, PVA, TN, etc.) because the picture quality directly depends on it. It all depends on what you will do on the computer. If, for example, do graphics (photo processing), then I would recommend IPS.

Thanks. No, I don’t do graphics, just a home computer. I will choose PVA. Thanks again for the advice.

And I always use a SIMilar program called Nokia Monitor Test. The program is very ancient, but very cool!

So, the article is not about a program, but an online service. And the program from Nokia is really cool, but it is already outdated and it was created when there were no TFT monitors either 🙂

I have an old LCD monitor. I decided to check it through this service. Everything is fine, but the backlight suffers, probably the lamps need to be changed, everything is too uneven.

Even brand new modern monitors have a backlight problem. In general, yes, the lamps eventually begin to shine dimmer and more uneven.

Is it possible to test a monitor with any resolution? And then I have a Retina Display. Will it break? )

Artem, it won’t break)) Use without fear.

Thanks! Monitor passed the test! Order, otherwise I had doubts about the quality of the matrix.

Where to plant viruses? Into the monitor? ))))))

Fast and affordable! Checked the order)

And broken pixels may not be initially and then appear?

But I didn’t check anything when buying. now I regret it. After a couple of days of use, I found three broken pixels on the monitor in the corner, apparently they were still at the time of purchase (((((((((((((((.

Alexander, when buying a monitor, it is imperative to check for flares and broken pixels. this is AXIOM!

And adjusting the monitor in this way can replace the calibration procedure or not?

Calibration with the device is the best setting, nothing can replace it.

Very good online test. set up the monitor without problems.

I build a profile with a spectrophotometer, taking into account external lighting. Almost everything happens in automatic mode.

I’m not sure. that at home by turning on your Monique to your computer. you will have normal colors.
This is a delicate job and you need to set up a monitor complete with a computer. All factors are important, and the lighting of the desktop is also important. For these purposes, there is also a calibration service. or calibrator.

I’m not going to buy a monitor yet, but I will note.

You always have very useful information. thanks.

As always, necessary and useful! Sergei, but you do not have the opportunity to post on the group “Before. and after 50”, maybe not everyone in OUR group who signed up read this USEFUL article! Success, Alexander.

I join Alexander, on behalf of those over 70.

Julia, it is better to buy in those where they are testing, even if there is a little more expensive, but not a pig in a poke.

“Sergey” you are just wrong, they put a Matrox video card and give you any fufel.

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