CHECKING THE MONITOR FOR BIT PIXELS - how to check it yourself

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

check the monitor for dead pixels

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

What is a broken pixel on the monitor

It is light, or, on the contrary, not a tanning point, which becomes visible when changing the spectra background. By the way, not only one-piece segments are spoiled, but also their components, in this case they are glowed in red and different color. They appear

  • For various reasons, the fundamental of them become:
  • Physical influence - strong pressing on the screen, blow or other power damage;
  • An unfavorable environment is increased humidity, heat, sharp temperature differences;
  • Fat evaporations and others, unusual conditions for technology.

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How to check the monitor on broken pixels

Such a procedure is easy to make at home or contact the master. Since the process does not require special knowledge in computer technician, it is not worth spending on the service, to identify the defect easily.

Before the purchase

To reinforce it, it is better to do a monitor test on broken pixels before purchasing, using the advantage of the buyer. As a rule, stores that are currently reputed, do not prohibit such actions, and if the consultant against the check - you can safely go to another trading point or try to call the administrator and negotiate with the management of the department.

If permission is received, you can select one of the options how to check the monitor on broken pixels:

  • The visual view is an unreliable method, as it is difficult to define "on the eye" the existence of non-working components is difficult. If other methods are not available, it is recommended to take a magnifying glass with you, which will help better consider every inches of the display;
  • Loading contrasting mono color pictures with a pre-prepared flash drive. The method quickly reveals such flaws if they are, then be sure to manifest;
  • Application of verification software developments. Accurately indicate the location and status of the breakdown.


Checking the monitor on broken pixels using the program is available to do, being at home or in the office. Even the highest category displays are often acquired by such disadvantages over time, although they have functioned without complaints. On the network mass of tools, you can use for free. These include:

  • DeadPixeltester - checks without installation;
  • IS MY LCD OK - starts using F functional keys;
  • Monteon - resource without installation file in online format;
  • VanityMonitortest - do not need download, but you will need a flash installer.

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What is the case not a warranty

If non-working or dependent element has been detected from a new device under warranty, this does not mean that it will be accepted for exchange or return money. The ISO13406-2 standard defines the minimum threshold of damaged point formations, depending on the display class.

How many broken pixels are allowed: Table

Monitor class

pixel type I pixel type II pixel type III
1 - the highest category 000
2 - middle option 225
3 - budget modification 515 fifty
4 - the cheapest fifty 150 500

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

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

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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.

dead pixel checker

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

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


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

  1. 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 this 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.
  2. JScreenFix - the application is launched through Java, which should be taken care of in advance. It detects damaged points for free, but it 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.

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 turns 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 network for 5-6 days 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 the 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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This material was written by a site visitor, and was credited with



A monitor is a device that an experienced computer scientist would never buy without first checking. The reason is simple - the saved couple of hours of time can turn into wasted money or years of irritation at work if the display turns out to be defective. One of the most common and annoying image defects is dead pixels. What it is? To begin with, it is worth clarifying what a pixel is in general.

A pixel, in simple terms, is the smallest image element on the screen that can take on a particular color. A broken pixel is a pixel that does not accept any color at all, or accepts an incorrect one. It might look like the picture below. Imagine that you have to work in front of a monitor with such a "joint" every day. An unpleasant prospect, isn't it?

Pictures on request broken pixel photos 

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An additional problem is that in such cases, the Consumer Protection Law will not help - a display with one or two defective dots is not considered defective and cannot be exchanged or returned, so you should protect yourself in advance. How to do it? Before visiting the store, prepare the following:

  1. A USB flash drive with pictures of different colors recorded on it. Among them should be at least black, white, red, blue and green fills. Write down the pictures in at least two different formats - it will be useful if the check will be carried out on the equipment of the store. At least .jpg and .bmp.
  2. Magnifying glass. The more its effect, the better! With the help of such a tool, it is much easier to spot a broken pixel than with the naked eye.
  3. Laptop or netbook, as well as a video cable for connecting to the monitor, depending on the available connectors. Most often, HDMI or DisplayPort.

Store employees may be trying to claim dead pixel checking is a paid service. The following arguments are effective (it is better to use them in order):

  1. "Plug the monitor into a power source to test it, and then I'll see everything I need on my own."
  2. “Yes, you will fulfill your plan on other people. And if you don't allow me to check, I'll just go to another store and buy there, but I won't come to you again. "
  3. "Call the administrator / manager, I'll talk to him." (In a conversation with the latter, mention that a story about a negative situation that has arisen will necessarily appear on a variety of thematic Internet resources indicating a specific store, as well as the names and positions of participants)

Most likely, you will be able to defend your right to conduct tests. If not, it's up to you, you can pay, but it's better to just go to another store, which also has the desired model. Why encourage income from such services?

Now directly about the verification. Connect the power to the monitor and connect the device to your computer or laptop. Insert the USB stick into the USB port. Open the first filled picture and switch to full screen view. Next, you need a magnifying glass. Using it, carefully and leisurely examine the entire surface of the screen for dead pixels. It is most convenient to do this in rows, from left to right and from top to bottom. Look for points that stand out sharply in color, and if you suspect a dead pixel, gently slide your finger across the display - perhaps this is just a speck. The verification procedure should be repeated with at least five prepared filled pictures. Yes, the process is quite tedious, and the eyes from such a load can begin to water, but this is better than buying a new monitor later or swearing while working on a defective one.

Bastrykin magnifying glass

If you find dead pixels, please bring another copy of the device for verification. If they are not there - great, you can take it! It is better, of course, to check the display for other parameters, such as the uniformity of the backlight and the absence of artifacts and plumes during fast movement of objects, but this is a topic for a separate article.

Have you ever encountered dead pixels on the screens of any devices? And do you check monitors, TVs, laptops, smartphones when you buy? Write in the comments!

This material was written by a site visitor, and was credited with



Today we will discuss how to test a monitor in a store before purchasing. With a little preparation, even an inexperienced user can spot the most common defects and avoid a bad purchase. Recall that a monitor is a technically complex product, and it will be difficult to return it without examination and proof of the buyer's “innocence”. Small flares or a certain amount of broken pixels are not a marriage, but they may not suit a perfectionist. All advice is based on the personal subjective experience of the author, so you don't need to take them as an absolute, but it's definitely worth considering.

First of all, make sure the integrity of the product by carefully examining it for mechanical damage. Pronounced defects in the form of a broken leg or a broken matrix will catch your eye right away, and therefore it is better to pay more attention to the little things. It is almost impossible to prove your innocence to a scratch or crack after the product has been at home.

If everything is in order with the appearance, proceed to further verification. But first, let's figure out the terminology.


Color shift - color change depending on the viewing angle. Quite a rare problem today, relevant for TN and to a lesser extent for VA matrices.

Pulse width modulation (PWM) - Invisible flickering of the backlight LEDs, which can adversely affect vision.

Glow - drop in contrast and turn black to gray with increasing viewing angle. Observed at a short distance from the monitor. Typically for IPS matrices, it is not considered a marriage. Often confused with highlights.

Highlights - Natural manufacturing effect of the LCD structure, which results in color distortion at the corners or edges when viewing dark images. Finding a monitor without glare is an almost impossible task today.

Backlight unevenness is inherent in most modern matrices. Most often it appears on a light shade.

Tint - the difference in color temperature in different parts of the screen. It appears as pale green and pink spots on a white background.

Crystalline Effect (CE) - a feeling of slight blurring of the image associated with the anti-reflective coating of the monitor. Absent on glossy devices and minimized on semi-gloss / semi-matte models.

Black crush - lack of shades close to black, which leads to the merging of dark elements of the image. A feature of some VA matrices.

Defective pixels - the main nightmare of any user. They are divided into three types:

  • Dead pixel - always off, looks like a dark dot on a light background;
  • "Burning" pixel - always works, visible as a white point on a black background;
  • Stuck pixel - a colored pixel, visible only against a contrasting background.

What to take with you

To check the device in the store, we need PC , which can be provided in the issuing area, or your notebook if it's a self-service store. On USB stick you should pre-record a couple of programs (we'll talk about them a little below), a video and a few photos. Programs can be replaced with a set of colored backgrounds.

Unlike TVs, monitors rarely have built-in diagnostics. It is also not worth hoping for verification using MHL and a phone. It is much safer to take a USB flash drive or laptop with you, having thought over the issue of the possibility of connecting to a monitor (the easiest way is if it is HDMI-HDMI).

Main problems

The main problems of monitors are - dead pixels, strong highlights, tint and uneven backlighting ... We will look for them.

Checking for defective pixels consists in displaying monochromatic backgrounds of black, white, red, green, yellow, blue, violet and blue colors on the screen. This will detect defective pixels. In principle, white and black are enough for a basic check, but it is easier to see a contrasting "stuck" pixel on color fills.

To find dead pixels, an ordinary one is useful magnifier. Seeing them on a 4K monitor, and even more so in a bright room, is a difficult task. Manufacturers admit a certain number of defects, but a principled buyer can always refuse the product, having discovered at least one. If you find a broken pixel, do not panic in advance - it may be just a speck.

According to the ISO13406-2 standard (in Russia - GOST R 52324-2005), a certain number of defects is allowed for each class of monitors:

  • 4 quality class - up to 50 "burning" pixels, up to 150 "dead" and up to 500 others;
  • Grade 3 - up to 5 "burning", up to 15 "dead" and up to 50 pixels with other problems;
  • Grade 2 - up to 2 "burning", up to 2 "dead" and up to 5 "stuck" pixels;
  • Class 1 - dead pixels are missing.

Most modern monitors belong to the second class and usually do not have dead pixels.

Highlights looking at a dark background at maximum brightness. It is advisable to do this in the dark. It is better to use a dark blue fill, as some modern monitors are able to dynamically adjust the brightness of pixels against a black background. Do not doubt that there will be highlights, but they should not interfere with the consumption of dark content.

When worried about flare, which is a characteristic feature of LCD matrices, it is often forgotten about uneven backlighting. If the monitor has a speckled appearance or looks like a crumpled rag on a light shade, run fools! it is better to refrain from buying. At the same time, we are looking for pink and green spots - tint .

Additional tests

If, after searching for dead pixels, your eyes still did not leak can adequately assess reality, a few more tests can be done.

Color fidelity measures how well a screen reproduces primary colors and tints.

Transitions between colors should be displayed without steps or gradients.

You can see the gradients for the primary colors.

The correctness of the "geometry" of the matrix will help to check grids, straight lines and "chess".

Test programs

All monitor testing programs are very similar. Once the most famous was Nokia Monitor Test. However, finding a version compatible with modern operating systems has proven difficult. Among the programs popular today, we can note the built-in diagnostic utility for the monitor in AIDA64.

Dead Pixel Tester focused on finding dead pixels. The program can be downloaded for free, it does not require installation. After starting the application, select the mode in the "Pattern" section and the fill color using the "Color Selector" button. Everything is simple and intuitive.

IsMyLcdOk also does not require installation. During the launch, an instruction appears, and the tests themselves are activated by the number buttons and the F2-F5 keys. In the list of available testing modes, there is a display of colored stripes, rectangles, vertical or horizontal lines.

For hardcore gamers who are afraid of plumes, you can additionally advise EIZO Motion Blur Checker ... A small program will check if the matrix smears the picture. For the same purpose, video clips containing dynamic scenes (sports, games, etc.) are used.

If you have the Internet, use simple and convenient online services with many test capabilities - , or EIZO Monotor Test.

Test videos

Sharpness, smooth transition between colors, blurred borders, geometry, absence of a loop can also be checked using special videos. Most often these are recorded screencasts of the same test programs. If there is no Internet, the video can be taken on a USB flash drive.

Demos from renowned manufacturers allow you to evaluate the image quality that the monitor can give live.

Photos are only useful for the subjective assessment of the monitor. The picture on the display should completely suit the buyer and match the internal color rendering standard.

A few general tips in the end

  1. Don't chase new products. In the world of monitors, revolutions do not happen that often, and it is better to take a 2- or 3-year-old solution that has proven itself to be excellent. Manufacturers often churn out “novelties” simply by changing design, labeling, and adding a bit of marketing.
  2. Bias and stereotypes aside. Absolutely all manufacturers have good and bad models. By eliminating the “unloved” brand, you simply limit your choice.
  3. Some options can be weeded out in advance by reading the description and reviews for the monitor. Most of the problems inherent in a particular model have already been found by others (see item 1).
  4. The picture on the display in the store does not always demonstrate the real capabilities of the monitor and often requires fine-tuning "for yourself" already at home. If desired, you can order a calibration service.
  5. Do not put two devices side by side for selection, especially with different types of matrices (see p. 4).
  6. Take your partner to the store. When checking the monitor, eyes get very tired, and therefore an assistant will not interfere.
  7. Listen to the monitor's power supply. An annoying low whistle in the quiet of your home can be unnerving.
  8. Don't rely on subjective tests like "wave a pencil" or "look through a smartphone camera" in search of PWM. Look for a flicker-free item in the model description (so-called Anti-Flicker, Flicker-Free, Flicker-Less, etc.).

Checking the monitor for dead pixels online

When buying a monitor for a PC or laptop, the quality and condition of the display is by no means the last thing to pay attention to. This statement is equally true in the case of preparing the device for sale. One of the most unpleasant defects, which very often can simply not be detected at a cursory examination, is the presence of dead pixels.

To find damaged areas on the display, you can use special programs such as Dead Pixel Tester or PassMark MonitorTest. But in some situations, for example, when buying a laptop or monitor, installing additional software is not the most convenient solution. However, with the availability of access to the network, web services come to the rescue for testing the quality of the screen.

How to check the monitor for dead pixels online

Of course, none of the software tools can detect any damage on the display on their own. This is understandable - the problem, if any, lies in the "iron" part of the apparatus without appropriate sensors. The principle of operation of solutions for checking the screen is rather auxiliary: tests consist in "flooding" the monitor with various backgrounds, patterns and fractals, allowing you to independently determine if there are prominent pixels on the display.

"Well, - you might think, - it will not be difficult to simply find homogeneous pictures on the Internet and check them with their help." Yes, but there is also nothing difficult in special online tests and they are more indicative in assessing defects than ordinary images. It is with such resources that you will get acquainted in this article.

Method 1: Monteon

This tool is a complete solution for calibrating monitors. The service allows you to thoroughly check various parameters of PC displays and mobile devices. There are tests for flicker, sharpness, geometry, contrast and brightness, gradients, as well as screen color rendition. It is the last item on this list that we need.

Online service Monteon

  1. To start the check, use the button "To begin" on the main page of the resource. Monteon Online Service Home
  2. The service will immediately switch the browser to full screen view. If this did not happen, use the special icon in the lower right corner of the window. Button to switch the Monteon online service page to full screen view
  3. Use the arrows, circles on the toolbar, or simply by clicking on the central area of ​​the page, flip through the slides and gaze at the display for faulty areas. So, if on one of the tests you find a black point - this is a broken (or "dead") pixel. Color accuracy tests in the Monteon online service

The service developers recommend testing in a dim or darkest room, since it is in these conditions that it will be easier for you to detect a defect. For the same reasons, you should disable any monitoring software for the video card, if any.

Method 2: CatLair

A simple and convenient website for finding dead pixels, as well as minimal diagnostics of monitors for desktop and mobile devices. Among the available options, in addition to the one we need, there is the ability to check the display synchronization frequency, color balancing and picture "floating".

Online service CatLair

  1. Testing starts as soon as you go to the site page. For a full check, use the button "F11" to maximize the window to full screen. CatLair online service page for checking the monitor for dead pixels
  2. You can change the background pictures using the corresponding icons on the control panel. To hide all elements, simply click anywhere on an empty spot on the page. Page with a blue background in the online service CatLair

For each test, the service offers a detailed description and hints on what to look for. As for convenience, the resource can be used without any problems even on smartphones with displays of very small sizes.

See also: Programs for checking the monitor

As you can see, even for a more or less thorough check of the monitor, it is not necessary to use special software. Well, to find dead pixels, nothing is needed at all, except for a web browser and Internet access.

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How to check a matrix for dead pixels and what is it

Before going to the store for a new monitor or TV, each customer should read this article, it will help you buy a matrix without defects. By the way such defects are not covered by the warranty and if you don't immediately check for broken pixels, you won't be able to replace it. Therefore, I decided to tell you how to do it and what it is.

What is a pixel

It's worth it to start the matrix consists of millions or even billions of pixels . If you look closely, you can see small squares on the screen, these are the pixels . Broken pixels are those points that do not match the color of the picture or do not work at all ... Probably some have already guessed how to make a check? If not, then it's easy to do.

Check for dead pixels

This is how broken pixels look like
This is how broken pixels look like

For this download pictures or videos with a solid color, i.e. green, red, black, white, etc. save them all to a usb flash drive and go to the store to choose the monitor or TV you like.

An example of images with which you can check for dead pixels
An example of images with which you can check for dead pixels
How to check a matrix for dead pixels and what is it
An example of images with which you can check for dead pixels
How to check a matrix for dead pixels and what is it
An example of images with which you can check for dead pixels
How to check a matrix for dead pixels and what is it
An example of images with which you can check for dead pixels
How to check a matrix for dead pixels and what is it
An example of images with which you can check for dead pixels
How to check a matrix for dead pixels and what is it
An example of images with which you can check for dead pixels

We ask the seller to connect the USB flash drive if this is a TV with usb there should be no problems, but if it is a monitor, then some stores refuse to connect it to a computer for verification and offer their paid services for checking for dead pixels, which costs about 1000 rubles, for example, I encountered this in DNS and M.Video ... Is it really not bad for viewing 5-10 images, we give 1000 rubles. Now let's Consider a scenario if you were still allowed to connect your USB flash drive with prepared images. Now we just need to open these images and carefully view the entire screen, whether there are any non-working dots or dots on it that do not correspond to the color of the picture, and so it is necessary to do this on all your downloaded pictures. If you did not find anything, then you are in luck, the matrix is ​​intact and you can buy it . If you still find dead pixels, then we ask the seller for another, exactly the same model of a monitor or TV. And we do the same sequence of actions.

What to do if you are not allowed to connect your usb flash drive with images.

There is a way out here too often a standard screensaver is shown on monitors. We ask the seller to check the monitor for operability and connect it instead of any other where the screensaver is running. Here they must not refuse. Personally, they did not refuse me. Having connected the monitor, we also carefully look for faulty pixels on this screensaver, but here it will be a little more difficult to find them because the screensaver is dynamic and constantly changing color, but you can still see them. If you didn't find anything, then you can buy such a matrix.

Matrix verification software

There is also such a method, but it is unlikely that you can use it in a store when buying a monitor. But just in case, I will share the name of the program, perhaps someone wants to check their monitor at home using Dead Pixel Tester

This is what Dead Pixel Tester looks like
This is what Dead Pixel Tester looks like

Types of dead pixels

I would also like to note a couple more points, there are several types of pixel malfunction, this is when pixels do not work at all (dead pixels), when pixels are constantly working (hot) they can be seen on a white background and pixels that do not change their color (frozen).

Dead pixel
Dead pixel
Hot pixels
Dead pixel
Frozen pixel
Dead pixel

Dead Pixel Recovery

Yes, it is possible to fix the problem using software called Bad crystal or UndeadPixel, but this method can only restore frozen or hot pixels. Also, some people advise trying to restore frozen or hot pixels using pressure, but I do not recommend this method because if you overdo it, you can damage the entire matrix.

This concludes this article, I hope it was useful to you. Don't forget to subscribe to our channel and like the posts. If you have any questions, then ask them in the comments.

One of the most common computer monitor problems is the appearance of individual dots on the screen, the color of which does not match the picture. The reason for this is damage or malfunction of the screen matrix, the smallest element of which is considered to be a pixel. This term is called an indivisible rectangular or round object with which an image is formed.

Several types of problem

A defect such as dead pixel may look different:

  • elements that always remain off are called "dead pixels" and will look like dark dots on a light background;
  • pixels that are always working are considered "hot" - they can be seen against a dark or completely black background, where they remain white;
  • Elements that do not change color are called "stuck" - they become visible only when the shade does not match the main image.

Important: if several pixels in one area are out of order at once, such damage is called a "group of dead pixels". Together they fold into rectangles ranging in size from 2 x 2 to 10 x 10 elements, or even horizontally or vertically in a line.

Allowable number of dead pixels

Check the monitor for damaged matrix elements immediately upon purchase. Such a check will avoid problems with the return of goods under warranty and an examination, proving that the cause of the malfunction was a factory defect, and not the user's actions.

How to check the monitor for dead pixels and fix everything

In accordance with ISO13406-2, a certain number of defective items are allowed per monitor. Therefore, even if checking the monitor for dead pixels showed their presence, this will be considered the norm in such situations:

  • the product belongs to the 4th quality class and can have up to 50 "hot" pixels, up to 150 "dead" and up to 500 with other types of defects;
  • the matrix is ​​released in class 3, which allows the presence of up to 5 permanently on, up to 15 all the time not working elements, as well as up to 50 pixels with other malfunctions;
  • monitor quality class - the second, and up to 2 "hot" and "dead" pixels and up to 5 "stuck" pixels can appear on the screen;
  • the first class of the monitor - there should be no dead pixels at all.

You can count on the complete absence of defective items only when purchasing a first-class product. However, most serial models belong to the second, and when checking them, you can find 1-2 or even 5 incorrectly working pixels. Although the class of the monitor shows how many defects are not considered defects, in fact, most products do not have them completely.

It is recommended to determine if the matrix is ​​damaged at the store where you buy the monitor. However, if this is not possible or the product is purchased online, you can also check it at home. For this, an online test or a special program is used, although noticeable defects can be detected with the naked eye.

Visual way of checking

The simplest monitor screen for dead pixels is to display a solid background in standard colors - black, white, red, green and blue. These five options will detect burning, dead and stuck pixels.

How to check the monitor for dead pixels and fix everything

You can check the monitor for defects in this way both at home and in stores. In the latter case, the backgrounds are copied to a USB flash drive and run on the computer connected to the purchase. In addition to monochrome images, you can use test images by finding them on the Internet.


Another way to find defects is a program for checking the monitor for dead pixels. You can use a suitable application both at home and in a store by writing not test images to a USB flash drive, but one of the testing utilities.

Dead Pixel Tester

One of the most popular monitor testing programs is Dead Pixel Tester. You can download it from the official website.

To check, follow these steps:

  1. Launch an application that does not require installation, and select the appropriate mode in the Pettern section and the color using the Color Selector button.
  2. If necessary, set the mode change using the Auto Color Cycle option.
  3. Check if dots appear on the screen that do not match the color of the picture.

The Exerciser function, activated by clicking on the corresponding button, allows you to find defects in a specific part of the screen. It creates a rectangular area that you can drag across the screen to find dead pixels.


Another program suitable for diagnosing computer monitor matrices is IsMyLcdOk. It can also be downloaded for free and does not need to be installed. Test instructions appear on the screen after the first launch.

The check is started with 4 keys - from F2 to F5. In the list of available testing modes, there is a display of colored stripes, rectangles, vertical or horizontal lines. In addition to standard tests, you can display a monochrome or gradient image.

Online services for verification

If you cannot download and run the utility (for example, due to restrictions on downloading and running on a working PC), you can check the monitor for dead pixels online. There are quite a few sites that allow you to find defects, but among them there are two of the simplest and most convenient to use.


To check the matrix defects on this resource, just press the test start button and select one of seven types of diagnostics and its variation.

How to check the monitor for dead pixels and fix everything

Important : Unlike most other sites, does not use a static image for testing, but a looped video. Therefore, with its help, you can not only find defects, but also control the rate of update of pixels on the screen.

Vanity monitor test

Another popular service that allows you to quickly detect problems with displaying a picture on the screen. To run the utility on a PC, you need Adobe Flash Player installed and a browser that supports it. To start checking, click on the HTML Window inscription.

How to check the monitor for dead pixels and fix everything

The modes in the online service are selected using the drop-down menu at the top. And you can use it to check dead pixels not only for a computer monitor, but also for a laptop screen, tablet and even a smartphone.

Repairing damaged areas

  • Sometimes the performance of a damaged matrix can be restored without contacting the service. You can decide how to remove dead pixels on the monitor after you understand where they came from. If the control transistor is out of order, it is possible to remove the damaged screen element only with the help of a special laser. However, if the subpixel freeze is the cause, the user can get rid of the defect by using Bad Crystal.
  • The UndeadPixel utility also performs very well. If you find a pixel error, launch the application by clicking "Start" in the "Undead Pixel" section. The screen will display a square that changes colors. Using the Drag & Drop function, you can move the square over the defective area. A permanent color change should occur within a few hours - after such a procedure, the pixel can be restored. Please note that bring back to life completely black pixels is no longer possible.
  • The free EIZO Test Monitor software (suitable for any device) contains 24 test images and will help you quickly optimize color settings, as well as check the screen for dead pixels. This utility does not require installation. Unzip the zip file and double click to run the application. Then click on the "Start TEST" button. Eight scenarios are available in the utility, including brightness and contrast calibration. If it becomes necessary to change any settings, the program will tell you how to do it.
  • Another method of treatment involves physical stimulation. To remove damage, take a cotton swab and gently press on the broken pixel. In a few minutes (from 10 to 15) the failed element can start working. It will be possible to cure the matrix in this way if the pixels were "stuck" or "hot".

How to check the monitor for dead pixels and fix everything

Features of returning the monitor to the store

If all else fails, the user who finds the defect has the right to return the monitor or exchange it for an equivalent product. Within 14 days, the return is made without specifying a reason: it is enough just to provide a sales receipt or cashier's receipt and packaging of the returned equipment, on which there should be no traces of use.

If 2 weeks from the date of purchase have already passed, the buyer has the right to count on the warranty repair of the monitor or its return if the device cannot be repaired. However, in this situation, the equipment is first sent for examination: according to its results, it is determined at whose expense the monitor will be repaired - the buyer or the seller.

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What are dead pixels

In all LCDs, the image is formed from a grid of pixels. They consist of three separate subpixels of red, green and blue, which are responsible for full color image formation. Each subpixel has a transistor to turn it on and off.

This is what a broken pixel looks like
It looks like a broken pixel on the screen /

Even the matrix of a conventional HD monitor contains over 6 million subpixels, and 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.

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 against a white background.

Left and right pixels are hovering, in the center - broken
Hanging pixels on the left and right, broken ones in the center /

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 while updating color.

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 such a complaint, you will most likely be denied service.

Dell Dead Pixel Policy
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 broken pixels on 20-inch screens to be the norm. Samsung has 7 dead pixels for monitors, while Dell has 1–6 stuck and 6–13 dead pixels, depending on the line of displays.

How to check the display

To avoid any trouble, it is worth checking the screen before purchasing. You can do this yourself or pay for the corresponding service in the store.

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.

You can visually determine the absence of defective pixels upon close examination on a solid white, black, red, green and blue background.

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 a mode and carefully look at the screen.
  • InjuredPixels is another free Windows app. Colors are switched with the mouse or using the 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 of subpixels. You can try to remove them.

1. Program method

The method consists in the cyclical display 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 by cycling colors.
  • PixelHealer is another utility for Windows. Eliminates stuck pixels by 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 speed and can cause an epileptic seizure. Do not look at the screen, but rather turn it to the side.

2. Manual method

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

Light pressure helps to sensitize stuck pixels and restore functionality
  1. Find the glowing pixel and unplug your monitor or TV.
  2. Take a cotton swab or pencil eraser.
  3. Gently press the display in the area of ​​the frozen pixel several times.
  4. Wait a few minutes, turn on the monitor and check the result.

Keep in mind that even if the stuck 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 your work, it is better to ignore them and leave everything as it is.

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