In the previous post, we talked about dead (or dead) pixels on the camera matrix. From a photographic point of view, they do not pose a particular problem and are automatically masked in a RAW converter or easily “corrected” in a graphics editor.
Bad pixels on a liquid crystal display (LCD) monitor are more of a nuisance because they usually cannot be corrected. Who wants to watch a constantly burning (or not burning) dead pixel in the center of the screen? Therefore, before purchasing, it is advisable to check the monitor for defective pixels.
If you want to exchange an already purchased monitor with dead pixels, keep in mind that there is international standard ISO 13406-2 regulates the acceptable number of defective pixels on an LCD monitor. Thus, the seller may refuse to exchange your monitor or refund your money if the number of defective pixels is within the normal range.
Acceptable number of defective pixels on the monitor
The permissible number of defective pixels depends on the display class (pixel fault class). The ISO 13406-2 standard distinguishes four classes: the first does not allow the presence of defective pixels. As a rule, all modern LCD monitors belong to the second class. Below you can calculate the acceptable number of defective pixels according to ISO standard 13406-2 for second class monitors:
Note. In counting fractional quantity defective pixels are rounded to a whole number by discarding the fractional part.
The ISO 13406-2 standard identifies the following defects: always-on white pixels (type I), always-off black pixels (type II), subpixel defects (type III), which appear as colored pixels always on/off in primary colors (red, green). , blue, cyan, magenta, yellow).
In addition, for resolutions of 1 million and higher, accumulation of color defective pixels (type III) is allowed nearby in a 5 x 5 pixel square. This defect is called a cluster. The second class of monitors does not allow 5 x 5 clusters of Type I or II defective pixels. See here for more details.
In practice, such a large number of defective pixels as specified in ISO 13406-2 is extremely rare. The wide tolerance can be explained by the fact that the standard was developed in 2000. Since then, LCD panel manufacturing technologies have undergone improvements.
How to check your monitor for dead pixels
Testing an LCD monitor for defective pixels involves carefully examining the screen to identify any abnormal pixels. The inspection is carried out sequentially for the primary colors: black, white, red, green, blue, cyan, magenta and yellow.
To check, we offer a self-made utility or you can use another one, for example, Nokia Monitor Test.
Note. If the monitor is connected via an analog RGB connector (D-sub), then you need to check the frequency and phase (not required for a digital DVI connection). For this purpose, in the proposed utility on start screen the background has a special "chess" pattern. It should be perceived as a uniform gray, without waves or interference. To adjust the frequency and phase, it is often enough to select the Auto Image Adjust (or similar) command in the monitor menu. If this does not help, then check that the refresh rate is set to 60 Hz in the screen properties and perform manual setting frequency and phase (usually there are “Clock” and “Phase” items in the monitor menu for this).
About fixing defective pixels
There are methods on the Internet for correcting defective pixels on LCD monitors. To be honest, I am skeptical about them. Firstly, at the manufacturing plant, most likely, they have already carried out all the “resuscitation” measures and it is unlikely that anything will be “cure”. Secondly, I tried it personally and at best it was possible to restore the dead pixel only for some time, and the next day it again turned out to be constantly on. And thirdly, correction of defective pixels is carried out at your own peril and risk. Not only can it not be cured, but it can also worsen the situation - there will be more abnormal pixels!
There are two fundamental ways to correct defective pixels.
The first method is programmatic influence. As an example, consider the JScreenFix utility (this is a Java applet; you will need to install a Java machine in your browser). To launch, click Launch JScreenFix.
Operating principle: dots of different colors are displayed on the screen in an endless loop. It is necessary to place a window “flickering” with all colors in place of the defective pixel. If after 20 minutes the pixel has not recovered, then the defect cannot be corrected.
I conducted an experiment with a ViewSonic 19" VA1916W-8 (1440x900) monitor. JScreenFix corrects a color defective pixel (type III) after 20 minutes, but not for long. After some time, it appears again. A similar result is obtained by the mechanical method described below.
The second method is to mechanically impact the defective pixel. The pixel massage technique can sometimes fix stuck pixels. But it is not recommended to use it, as it can worsen the situation even further. If you decide or you don’t mind the monitor, then before doing so it is recommended to use a softer, programmatically described above.
Technique mechanical impact is as follows:
- turn off the monitor;
- use a damp cloth to avoid scratching the surface;
- press through a napkin with your finger (or something suitable) on the area of the defective pixel;
- at the moment of pressure, turn on the monitor;
- After turning it on, remove your finger (stop pressing) - the stuck pixel should disappear.
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How to check your 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 operation of the entire system. Since the monitor is a mirror of the soul of the computer and its performance, a lot depends on the screen and its integrity.
One of the few enemies of modern monitors is the presence dead pixels, which reduce the enjoyment of its use. A pixel is the smallest part of the display that displays an image. New monitors include millions of pixel data. A dead pixel is one that is unable to convey color correctly.
There is some variety of dead pixels, depending on the type of fault:
- Constantly lit pixels;
- Always not working (black);
- Pixels that are not capable of transmitting RGB colors are stuck in one position, usually red, green or blue;
- A defect in a group of pixels is considered in a 5x5 square.
Depending on the severity of the problem, the pixels may be completely broken or simply have a laggy color that does not change.
You should first of all pay attention to dead pixels when you purchase a monitor or TV, as it can be difficult to return later. According to the ISO13406-2 standard, there are four types of display grades. The first completely eliminates the presence of dead pixels, the second allows from 2 to 4 depending on the size of the monitor. Most often, the manufacturer sorts displays as second grade, so you won't necessarily get a refund or replacement in this case. Before accepting a monitor, you should test it and make sure that you have received a quality product, because the store is not obliged to change it, and you should not accept such a monitor, be vigilant.
Read also: How to choose a monitor?
It should also be noted that there is some possibility of fixing the problem of dead pixels, but it is better not to let it get to that point, although if the malfunction appears during operation, then in the end there will be a way to fix the problem.
Making a choice hard drive
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, or a group of colors, you can more easily see a non-working pixel. This way, you can fill the display with one color, which will make finding different pixels much easier.
The main difference here is the way the program works - there are websites that can help you perform diagnostics, but you can also download stand-alone client applications.
Monitor Testing Sites
One of the representatives of such a niche is the website monteon.ru. It provides the opportunity to test the screen not only of a computer monitor, but also 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 http://monteon.ru;
- Click "Start";
- As soon as the program starts, you will see 7 color bars. Also, using a certain slideshow at the bottom of the page, you can change colors (small dots) or click the arrows to the side;
- You can also use the drop-down menu to select gradient, flicker, sharpness, etc. All pictures are aimed at identifying dead pixels and also at determining the color rendering quality of the monitor. All shades of colors should be clearly visible.
The main disadvantage of this kind of sites is the inability to check the bottom part of the monitor, which is allocated under the menu.
Another representative of the niche is the well-known site http://tft.vanity.dk. It also includes a wide range of possible color images, which help identify mismatched colors or lack of color rendering at all.
To start the test, click on the “HTML windows” button, after which the monitor pixels will be checked. The active menu is at the top and it is pop-up, that is, it appears when you hover over it. Here you will find a large range of standard gradients and simple colors, and there is also the ability to create your own gradient.
You should also be careful, because the problem with the pixel is not always obvious; sometimes one channel is blocked RGB colors, which prevents the pixel from changing hue.
Programs for checking pixels on the monitor
Let's look at several applications, since they all work on the same principle.
Among all, we can highlight such programs as: IsMyLcdOk and Dead Pixel Tester. They weigh very little, but are effective because they allow you to test the taskbar area.
I have a monitor that has 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 on dark background catch your eye. Thus, you can be cheated by unscrupulous sellers; it is better to use one of the programs.
The program for dead pixels on the monitor IsMyLcdOk is extremely easy to use, you need:
- Download the utility;
- No installation required, just run it and you will see a menu of hot keys;
- By pressing from 1 to 0 you will see color and gradient changes across the entire screen. There are also additional changing pictures that can be used by pressing F2 to F5. Exit to the main window via F1.
Another version of DPT, a little more convenient and functional than the previous program. To use it you need:
- Download DPT from http://dps.uk.com/software/dpt;
- Launch the utility and you can change colors in the “Pattern” drop-down list. It is very convenient to do this simply by scrolling the mouse. You can also make an automatic color change using a timer;
- It is also possible to customize color range. Distinctive feature is the presence of the “Exerciser” item, which creates a small square with a changing color. Good tool, if it is difficult to determine the presence of dead pixels (it can be moved).
Program for eliminating dead pixels
Exists special utility, which can help with a similar problem, it’s called Bad Crystal. The main function comes down to frequent color changes, which can break through a stagnant pixel and return it to service.
Cleaning Your Monitor Properly
There is no guarantee that this will help, the chance is about 50 to 50. You can set the number of color changes by setting the tempo of the program. You just need to drag active window 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 also have a negative result, so always monitor the program’s actions 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 frozen elements. If you still have questions on the topic “Checking your monitor for dead pixels,” you can ask them in the comments
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How to check a monitor for dead pixels before purchasing
The possibility that a monitor may have dead pixels—points where either black or white is constantly visible—applies not only to monitors purchased on the used market. The latest monitors from the manufacturer may arrive at sellers' warehouses already with factory defects, in particular, with the same dead pixels. And the worst thing is that when purchasing from an online store, the seller may hastily send one of these monitors to the buyer without any prior verification. It is unlikely that he will detect the problem immediately, in the mail upon receipt. Dead pixels will be revealed even if you look closely while working at the monitor.
However, before you send your monitor back, you should know that dead pixels are acceptable in monitor production - this norm is even regulated by the ISO 13406-2 standard. This standard provides 4 classes of monitors, and in each of these classes the presence of one or more dead pixels is allowed. Only the highest - 1st class, which includes high-quality and expensive monitors for professional activity.
Number of permissible dead pixels depending on the monitor class
- Class 1: 0 defective pixels per million.
- Class 2: up to 2 defects of types 1 and 2 or up to 5 defects of type 3 per million.
- Class 3: up to 5 type 1 defective pixels; up to 15 - type 2; up to 50 defective subpixels per million.
- Class 4: Up to 150 dead pixels per million.
As you can see, each of the classes also implies a type of defective pixels.
- Type 1: Constantly lit pixels.
- Type 2: permanently off pixels.
- Type 3: pixels with other defects, including defects in subpixels (RGB cells that make up a pixel), i.e. constantly lit red, green or blue subpixels.
- Type 4: Several defective pixels in a 5 x 5 pixel square.
To find out what class your monitor belongs to, you will most likely have to contact technical support. support, because manufacturers rarely indicate such information on the box or in the specifications. On the other hand, most monitors for general use often fall into the second class.
Dead subpixel (left) and burning pixel (right)
Monitor monitor before purchase
There is only one way to prevent the purchase of a monitor with dead pixels - you must personally check it at the point of sale and see for yourself that all the pixels are intact. Naturally, without special software it is quite difficult to do this. You must ask the seller to conduct a special test for the monitor you have chosen, during which various images are displayed on the screen - alternately white and black, special grids, checkerboard or other patterned fills, colored stripes, etc., making it easy to notice matrix defects. Such software for testing the display should be in any serious hardware store or service center.
Theoretically, you can reduce the risk of buying a monitor with dead pixels by choosing a model based on high-quality screen matrix types. Thus, in high-quality and rather expensive IPS, MVA and PVA matrices, dead pixels are less common than in budget TN matrices. In addition, if there are dead pixels in such matrices, they are often black (type 1), which is less noticeable than the multi-colored dots of burning pixels in TN matrices.
Well, as we see, the situation with monitors fits into the general rule of buying any product - you always have to pay for good things and carefully look at what you buy.
fsch.com
Utilities for finding dead pixels (how to check a monitor, test 100% upon purchase!)
A monitor is a very important part of any computer, and not only ease of use, but also vision depends on the quality of the picture on it. One of the most common problems with monitors - this is the presence of dead pixels.
A dead pixel is a point on the screen that does not change its color when the picture changes. That is, it burns with white (black, red, etc.) color, without conveying color, and it burns. If there are many such points and they are in prominent places, it becomes impossible to work!
There is one caveat: even when buying a new monitor, you may be given a monitor with dead pixels. The most annoying thing is that a few dead pixels are allowed by the ISO standard and returning such a monitor to the store is problematic...
In this article I want to talk about several programs that allow you to test your monitor for dead pixels (well, and protect you from buying a low-quality monitor).
IsMyLcdOK (best dead pixel search utility)
Website: http://www.softwareok.com/?seite=Microsoft/IsMyLcdOK
Rice. 1. Screenshots from IsMyLcdOK during testing.
In my humble opinion, this is one of the best utilities to find dead pixels. After launching the utility, it will fill the screen with different colors (as you press numbers on the keyboard). You just need to look carefully at the screen. As a rule, if there are dead pixels on the monitor, you will immediately notice them after 2-3 “fills”. In general, I recommend it for use!
Advantages:
- To start the test: just start the program and press the numbers on the keyboard one by one: 1, 2, 3 ... 9 (and that’s it!);
- Works in all versions of Windows (XP, Vista, 7, 8, 10);
- The program weighs only 30 KB and does not require installation, which means it can fit on any flash drive and run on any computer with Windows;
- Despite the fact that 3-4 fills are enough to check, there are many more in the program.
Dead Pixel Tester (translation: dead pixel tester)
Website: http://dps.uk.com/software/dpt
Rice. 2. DPT when working.
Another very interesting utility that quickly and easily finds dead pixels. The program also does not require installation, just download and run. Supports all popular Windows versions(including 10).
To start the test, just launch the color modes, change pictures, select fill options (in general, everything is done in a small control window, you can close it if it gets in the way). I like the auto mode better (just press the "A" key) - and the program will independently change the colors on the screen at short intervals. Thus, in just a minute, you will decide whether to buy a monitor...
Monitor test ( online check monitor)
Website: http://tft.vanity.dk/
Rice. 3. Monitor test online mode!
In addition to programs that have already become a kind of standard when checking a monitor, there are also online services for searching and detecting dead pixels. They work on a similar principle, the only difference being that you (for verification) will need the Internet to access this site.
Due to the complexity of the structure of LCD panels, the production of such screens is very difficult. Not even all companies producing lcd tvs, have their own production of liquid crystal matrices. Such displays are produced by only a few companies in the world, and the rest simply buy ready-made screens from them for further production of televisions. So, with such complex production, matrix defects are possible, manifested in the appearance of dead pixels. And they can only be identified on an already assembled device.
If we require manufacturers to 100% reject matrices with defects, then the production of LCD panels would be very expensive and this would lead to a significant increase in the price of LCD TVs and monitors. Therefore, a compromise was found in which the presence of a certain number of dead pixels on the TV screen was allowed, and this was formalized into certain standards.
By standards Dead pixels are divided into several types:
- Dead pixels (as well as “dead” or “bad” pixels, the official name is defective pixels) are a defect in an electronic device that reproduces an image. Manifests itself in the constant brightness of the glow.
- Hot pixels are a defect in which the value of the output signal has an incorrect dependence on the input signal, or the output signal is most dependent on other factors (temperature, the value of neighboring pixels).
- Dependent pixels- the dependence of a particular pixel on the values of its surrounding ones. Typically not noticeable in realistic images. Can only be detected on the monitor by a “checkerboard” fill or “grid”.
- Stuck Pixels-always “on”. Often the cause of their occurrence is external influence. They usually occur due to improper operation of the transistor.
A cluster is a group of pixels located nearby.
The ISO 13406-2 standard establishes 4 quality classes of LCD matrix based on the permissible number of dead pixels on your TV or other device.
- Class 1: 0 defective pixels per million.
- Class 2: up to 2 defects of types 1 and 2 or up to 5 defects of type 3 per million.
- Class 3: up to 5 type 1 defective pixels; up to 15 - type 2; up to 50 defective subpixels per million.
- Class 4: Up to 150 dead pixels per million.
Among mass-produced LCD panels, there are practically no 4th class products.
The standard defines 4 types of defective pixels:
- Type 1: Constantly lit pixels.
- Type 2: pixels that are constantly off.
- Type 3: pixels with other defects, including defects in subpixels (RGB cells that make up a pixel), i.e. constantly lit red, green or blue subpixels.
- Type 4 (group of defective pixels): several defective pixels in a 5 x 5 pixel square.
You can check your monitor for dead pixels by carefully inspecting the image, changing its solid fill to black, white, red, green, and blue. The absence of “dots” of a different color in such a sequence certainly indicates the absence of dead pixels.
To make sure there are no “hot” and “dependent” pixels, it is additionally recommended to fill the monitor with “checkerboard” and also with a mesh.
Dead pixels can be found in products from any manufacturer; no one is immune from defects. Be it dead pixels on a phone, on a camera display, on a TV (monitor), or on any other device equipped with a display. Therefore, before purchasing, checking for defective items comes first. The most simple option The check is to display black and white images on the screen. If there is a faulty or dead pixel, against such backgrounds they will immediately catch your eye.
At matrices LG, Panasonic, Philips, Samsung, Sharp, Sony, Thomson, Toshiba 0.3% of the total number of pixels, it is considered technically intact and cannot be exchanged or returned. That's the guarantee :)
For the buyer, one pixel is already a loss, and he wants to return/exchange the product as soon as possible, but not everything is so simple. In general, you need about 4-5 dead pixels, and then the product can be exchanged. In general, if there is at least one or a suspicion of a defective pixel, the product is not worth buying. Fortunately, nowadays there is a great choice.
You shouldn’t be lazy and you need to insist on a scheme: show the product in action - I’ll pay you money. The fact is that on LCD screens it is completely legal to have a certain number of dead pixels. And this is not considered a defect in the product.
The conclusion is that the problem is quite controversial - both sides can be understood. Another thing is that a self-respecting store will offer to look/check the product.
Acceptable number of dead pixels according to ISO 13406-2 standard.
Dead pixel values on TFT monitors are defined by the international standard ISO 13406-2.
This standard defines the limit values for the number of dead pixels on TFT monitors in units per million. In accordance with it, LCD panels are divided into 4 classes depending on the number of dead pixels different types, as indicated in the table below.
TYPE 1 – constantly glowing pixels.
TYPE 2 – permanently turned off (“dead”) pixels.
TYPE 3 – defective red, green and blue subpixels.
It should be noted that some monitor manufacturers and/or sellers give Better conditions guarantees/purchases. For example, they offer to replace the monitor if at least one “dead” pixel of any type is detected or if a group of three or more “dead” pixels are spaced together, or no further than a certain number of points from each other and/or from the center of the screen.
More
"Defective pixels"– a defect in an electronic device that receives or reproduces an image and has a pixel structure. Manifests itself in the invariance of the matrix output signal digital camera) several pixels. "Hot Pixels"– a defect in which the value of the output signal has an incorrect dependence on the input signal, or the output signal is most dependent on other factors. "Dependent pixels"- a slang term meaning the dependence of a particular pixel on the value of its surroundings. Typically not noticeable in realistic images. It can only be detected on the monitor by a “checkerboard” fill or a “grid”. The reason for the appearance of such a defect is a malfunction of the matrix element, in the case of a “dead pixel” - a constant malfunction. Since manufacturing a matrix is an expensive and time-consuming process, and it can be checked for malfunctions only after complete production, manufacturers try to reject products as rarely as possible, classifying them according to test results as one of the quality classes. For electronic devices For information storage, the term “broken cell”, “faulty cell”, “faulty block” is traditionally used, since, unlike photographic and display devices, there is no obvious connection with the location of the defect in the image.
Pixel graphics– a form of digital painting created on a computer using a raster graphic editor, where the image is edited at the pixel level, and the image resolution is so small that when viewing the image, the pixels can be distinguished by the naked eye. On older computers, Game Boy games, older console games, and many PC games. mobile phones Pixel graphics are mainly used, since this is the only way to make a small image clear on the low screen resolutions typical of these devices.
If you want to exchange an already purchased monitor with dead pixels, keep in mind that there is an international standard ISO 13406-2 regulating the permissible number defective pixels on the LCD monitor. Thus, the seller may refuse to exchange your monitor or refund your money if the number of defective pixels is .
1Acceptable number of defective pixels on the monitor
The permissible number of defective pixels depends on the display class (pixel fault class). The ISO 13406-2 standard distinguishes four classes: first does not allow the presence of defective pixels. As a rule, everything is modern LCD monitors relate to second grade. Below you can calculate the acceptable number of defective pixels according to the ISO 13406-2 standard for monitors second class:
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Note. In the calculation, the fractional number of defective pixels is rounded to a whole number by discarding the fractional part.
The ISO 13406-2 standard identifies the following defects: always-on white pixels (type I), always-off black pixels (type II), subpixel defects (type III), which appear as colored pixels always on/off in primary colors (red, green). , blue, cyan, magenta, yellow).
In addition, for resolutions of 1 million and higher, accumulation of color defective pixels (type III) is allowed nearby in a 5 x 5 pixel square. This defect is called a cluster. Second class monitors does not allow the presence of 5 x 5 clusters with defective pixels of type I or II. For more details see.
In practice, such a large number of defective pixels as specified in ISO 13406-2 is extremely rare. The wide tolerance can be explained by the fact that the standard was developed in 2000. Since then, LCD panel manufacturing technologies have undergone improvements.
2How to check your monitor for dead pixels
Examination LCD monitor on presence of defective pixels consists of carefully examining the screen to identify abnormal pixels. The inspection is carried out sequentially for the primary colors: black, white, red, green, blue, cyan, magenta and yellow.
The user consumes information through a monitor or laptop screen, so the presence of defects on it is unacceptable. The monitor itself is a fairly simple device, but at the same time quite fragile. The main trouble that a user may encounter when purchasing a monitor is the presence of dead pixels, that is, screen elements that are not capable of correctly transmitting colors. To avoid such a problem, you need to carefully check it when purchasing a monitor, and in this article we will look at how to do this.
Table of contents:What is a pixel, what are dead pixels?
First we need to tell you a little theory. A pixel is the smallest part of the display that displays a picture. Depending on the display resolution and its diagonal, a pixel may be larger or smaller in terms of physical size.
Please note: Modern monitors can use several million pixels.
If one pixel or group of pixels is not working, the image on that part of the screen will not match the one sent to the monitor from system unit. There are several types of dead pixels:
- Non-working. These pixels do not convey the image, and they are always black;
- Stuck pixels. Most often these are pixels that are stuck in blue, red or green. They are not capable of working with RGB colors;
- Constantly glowing pixels. These are pixels that are constantly lit in white.
Please note: Sometimes not just one pixel fails, but a group of pixels in a horizontal or vertical stripe, or “squares” of pixels, for example, 5 by 5 or 10 by 10 elements.
Why is it important to check your monitor for dead pixels when purchasing?
When purchasing a new monitor or laptop, be sure to immediately check for dead pixels in the store. This is due to the fact that if you discover such a defect after purchase, it is far from certain that you can return the monitor under warranty. The fact is that there is a standard ISO13406-2, which determines the permissible number of defective pixels for monitors of various classes.
This standard provides for the release to the market of monitors in 4 quality classes. Most best class– the first, the worst – the fourth.
Please note: Almost all mass-produced monitors are produced according to the second quality class, respectively, according to the standardISO13406-2 implies the presence of dead pixels.
According to standard ISO13406-2, the following number of non-functioning or malfunctioning pixels in monitors of various classes per one million pixels in the panel is allowed:
- 1st quality class. There should be no defective pixels at all;
- Quality class 2. No more than 2 permanently lit white pixels, 2 permanently off black pixels, 5 pixels with other defects are allowed;
- Quality class 3. No more than 5 permanently lit white pixels, 15 permanently non-lit black pixels, 50 pixels with other defects are allowed;
- Quality class 4. No more than 50 permanently lit white pixels, 150 permanently non-lit black pixels, and 500 pixels with other defects are allowed.
It is worth noting that the acceptable value of defective pixels does not mean that they are necessarily present on a monitor of one class or another. The quality class of a monitor according to accepted standards is determined by the device manufacturer itself. Depending on what class it determines, additional warranty obligations are imposed on it.
How to check your monitor for dead pixels
When purchasing equipment in a store, you always have the opportunity to check it right on the spot, and in a situation with a monitor, this definitely needs to be done. There are special applications that allow you to check your monitor for defective pixels. Programs are available, both standalone and presented on various sites.
The principle of operation of all programs for checking the screen for dead pixels is identical. The entire working area of the display is filled with a single color, a group of colors or a gradient, which allows you to see dead pixels if they are present on the monitor. Let's look at the main programs and sites that can be used for such a check.
Programs for checking your monitor for dead pixels
If you buy a monitor in a store, it is better to first record one of the programs described above on a flash drive in order to perform an on-site test.
Dead Pixel Tester
One of the most famous free applications to check your monitor for dead pixels. To use Dead Pixel Tester you need to:
Among the program’s capabilities, it should be noted that the function of changing modes can be set to a timer; to do this, you need to check the “Auto Color Cycle” box and set the time in milliseconds. After this, the modes will change automatically.
Another feature of the program is the creation of a limited area on the screen with constantly changing colors. To create it, you need to click on the “Exerciser” button, after which the corresponding square area will be created. It can be dragged with the left mouse button. If there is any doubt that there is a dead pixel in some part of the monitor, this tool helps to verify this.
IsMyLcdOk
IsMyLcdOk is another application that does a good job of diagnosing dead monitor pixels. The program also does not require installation and can be easily downloaded for free on the Internet. The application weighs very little and works extremely simply.
When you first launch the IsMyLcdOk program, information will appear that describes what you should click to perform the test. To return to the instructions after starting the diagnostics, you will need to press F1.
To test, select the mode using the buttonsF2-F5. Among the monitor test modes available in the IsMyLcdOk program:
- Check BitBlt MB/sec;
- Painted rectangles;
- Painted stripes;
- Durability testing;
- Vertical lines;
- Horizontal lines.
In addition to special modes, it is also possible to simply switch colors or gradients.
Sites for checking your monitor for dead pixels
If you don’t want to download a program to your computer to check your monitor, you can use sites with similar functionality. Let's consider a couple of options.
Please note: Sites for checking the screen for dead pixels are convenient to use, for example, when testing tablets or smartphones.
Monteon
A simple and functional service for testing your monitor for dead pixels.
To use the service you must:
To finish testing the monitor with the service, click on the house icon in the lower left corner of the screen.
Please note: ServiceMonteon, unlike the programs discussed above, has a mode in which looped video is shown. IN this mode You can check the pixel color refresh rate.
Vanity Monitor Test
Quite an old, but well-proven service that allows you to test your monitor. For this service to work, you will need to have it on your computer. Adobe Flash Player, which can be considered its disadvantage. To start testing, you need to click “HTML Windows”.
The choice of operating mode in the Vanity Monitor Test program is carried out through the drop-down menu at the top.
Treatment of dead monitor pixels
Dead pixels on the screen are not always a death sentence. In some cases it is possible to get rid of them and make them function again standard mode. There are several ways to do this:
If none of the above methods helped restore the dead pixel, you will have to put up with it or replace the monitor.
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