Home / Overview of Linux / Testing the monitor for broken pixels. Checking the monitor for dead pixels and their treatment. Checking the monitor for defective pixels

Testing the monitor for broken pixels. Checking the monitor for dead pixels and their treatment. Checking the monitor for defective pixels

If you need to perform a monitor test and appreciate its working qualities, then I recommend paying attention to the PassMark MonitorTest program. The utility will consistently generate test patterns on the monitor screen in different resolutions and color depths. The developers of this program assure that on the basis of such testing, you can choose the most optimal monitor settings and maintain the health of your eyes. The program can test and evaluate the quality of CRT, LCD and plasma monitors.

LCD (Liquid Crystal Display) - liquid crystal monitors (flat display based on liquid crystals).

TFT (Thin Film Transistor) is a type of liquid crystal display (thin film transistor).

PDP (Plasma Display Panel) - plasma monitors (between two glass surfaces inert gas argon or neon).

CRT (Cathode Ray Tube) - monitors based on a cathode ray tube (already retired).

I think you understand that it is unnecessary to neglect such testing of the monitor, especially if you work for many hours at the computer.

A properly configured monitor reduces eye strain.

Monitor - very important digital device, with whom we are forced to communicate for long hours. Someone earns money on the Internet, and someone just has fun at the computer. Both of them need to monitor their eyesight and.

Therefore, dear colleagues, guys who are starting the path of an Internet businessman or employees working in the office, pay special attention to your monitor and select the optimal settings for it. In this way, you will keep your eyes healthy for many years to come. Agree, no one wants to be among those who lost their health trying to make money, and then lost all the money trying to regain their health.

Keep in mind that a properly selected and adjusted monitor reduces the strain on your eyes. And by creating small breaks for yourself at the computer (in order not to forget to take a break, you can install the Workrave program) and doing gymnastics for the eyes, you will significantly reduce the risk of developing myopia.

If you are a blogger, copywriter, office or business employee and you often have to work with text on an LCD monitor, then try to reduce its brightness and contrast, so you will avoid unnecessary strain on your eyes. After working for an hour or two on a bright LCD with texts, you run the risk of getting very tired. At the same time, if you work with graphics, and your rest is spent playing games, then you need high levels brightness and contrast. Therefore, do not forget about the correct setting of the colors of the monitor - sometimes special software and reference color samples are included in the package for this purpose.

Speaking formally, LCD and CRT monitors have some inherent disadvantages. So, the old CRTs are not always doing well with the screen geometry, while LCDs have so-called “broken” pixels and sometimes they are too inertial (in new generations this drawback is less and less relevant), that is, a loop stretches behind moving objects on the monitor. You can check the quality and choose the optimal settings on an LCD, PDP or CRT (old models) monitor using the Passmark MonitorTest program. The program runs under operating system Windows XP/7 (32/64-bit).

It should be said that the monitor test program is paid, but in free mode it will work for 30 days. In the registered version, the program's capabilities will become wider. Regardless of the registration of the program, perform actual testing for the touch monitor Touch screen tests, Multitouch screen tests ( touch screen tests) is currently possible only on the Windows 7 operating system. As part of the classic tests for selecting the optimal monitor settings, there is the possibility LCD monitor for dead pixels.

Tests for optimal monitor settings.

The main window of the PassMark MonitorTest program displays information about the monitor, video card and contains test management tools. The "Video Info" parameter group provides information about the video card and monitor. I think you will be able to interpret this information without much difficulty. The “Test config” group is much more interesting for us.

The "Select video mode" list is designed to select the video mode in which testing will be performed. The "Select test" list allows you to select all or one of the necessary tests to test the monitor. A considerable number of tests are available in the program, which I will briefly discuss below.

So, by selecting the "All Tests" parameter from the "Select test" list, you run all tests sequentially - to start testing, click "Start". If you do not need complex testing of the monitor, then you can select one specific type of test from the drop-down list.

The most basic "Master Screen" test is designed to evaluate the overall quality of the monitor and its optimal settings.


The circles, of which there are 4 on this screen, must be perfectly round, without deformation and without turning them into ovals. However, on monitors with an aspect ratio other than 4:3, the small circles may appear slightly oval. Along the outer edge of the image is a border consisting of black and white cells. If part of the border extends beyond the screen or there is empty space between the edge of the screen and the border, this means that the monitor needs to adjust the size or position of the image.

Four areas of alternating white and black stripes along the edges of the large circle have a step of 1 pixel (top left), 2 pixels (bottom left), 3 pixels (top right), 4 pixels (bottom right). You should be able to clearly see individual stripes even on a single pixel grid. If the grid does not appear as a grid but as a gray filled area, you may need to set a lower resolution for your monitor. Well, if the details are indistinguishable on a two-pixel grating and changing the resolution does not give results, this is already a cause for concern.

A stripe passes through the center of the large circle, consisting of 3 primary (Red, Green, Blue) and 3 additional colors (Yellow, Cyan, Purple). Colors should have the same brightness and intensity. The boundaries between colors should be clear.

Pay attention to other figures depicted on the screen. Their colors should be uniform, the boundaries between them clear and perfectly straight. Also look at the control panel located at the bottom of the screen - it is used to navigate through the tests (arrow buttons), you can use it to call up help, close the test window. Also, the panel can be removed from the screen if it interferes with your work with the test - for this, use the button with the arrow pointing down. To display the panel again, use the "H" key on your keyboard.


The "Solid Black", "Solid Red", "Solid Green", "Solid Blue", "Solid White" tests fill the screen with black, red, green, blue and white, respectively. The brightness of the color on the entire screen should be the same, without dark and light spots. In addition, these tests can be useful in finding dead pixels on LCD monitors. It is best to test the monitor for dead pixels immediately after purchasing it.


The "Scale Black-Red", "Scale Black-Green", "Scale Black-Blue", and "Scale Black-White" tests fill the screen with gradients from black to red at maximum brightness, from black to green, to blue and to white, respectively. . The change in brightness should progress at the same pace, top, bottom and center of the image. That is, here you should see a smooth color change, the brightness at the bottom and top of the monitor should be the same.


Tests "Moire interference 1", "Moire interference 2" are used to detect moiré. If streaks, circles are clearly visible on the output image, this is not very good and may indicate problems with focusing. A little moiré is normal.


The "Convergence dots" (displays a grid of white dots) and "Convergence lines" (displays a grid of white lines) tests output white dots and lines on a black screen. The screen should be perfectly black, and the dots and lines should be white, without impurities of other colors. The image must be clear.

The "CrossHatch" test allows you to identify problems with the screen geometry and setting the size of the visible image. All circles should be perfectly round, and a dotted line should be visible at the very edge of the screen (zoom in to see the dotted line).


The "Mask" and "Mask2" tests are designed to adjust the white balance.


"Gamma Red", "Gamma Green", "Gamma Blue", "Gamma White" tests are designed to test monitor gamma.


The "Contrast Red", "Contrast Green", "Contrast Green", "Contrast Blue", and "Contrast Black and White" tests are designed to examine the monitor's contrast ratio. The test displays colors of different intensities; a well-marked difference between the intensities of 0 and 20% is considered quite good.


The Zooming test displays multiple rectangles. Outer (thin white line) and some rectangles inside that periodically switch from black to white. The less flickering and movement of the image, the better.


The Fonts Test displays texts written in different fonts - from 13 to 6 points. All of them must be read. Using the Font button on the sing-along test tool, you can customize the text and background colors.


"LCD Pixel Persistence" - this test is designed to study the inertia of LCD monitors. It outputs multiple rectangles moving with different speed. A monitor with a high inertia will display a trail to the left of the moving figure. The shorter the loop, the better.


The Printei Test is designed to compare the colors (monitor color test) that you see on the screen with the colors that are produced when the images are printed on the printer. Print a test image by pressing the "Print This Page" button on the control panel and compare the colors on the paper with the colors on the screen. To match, adjust your monitor or printer if it supports color matching.

Free Nokia Monitor Test to check and optimize your monitor.

The program has in its arsenal also not a bad set of tools for testing the monitor and may well check the geometry, contrast, brightness, resolution, focus, color reproduction, and even the speakers built into the monitor. Of course, the PassMark MonitorTest program has a number of advantages, especially in the registered version, but if you want to save money, you can use the Nokia Monitor Test utility.


Testing has shown that the free analogue for optimizing the monitor and finding dead pixels on the monitor, Nokia Monitor Test, does its job well. Unfortunately, the program is no longer supported by its developer, but it is still relevant today. Since it is no longer on the developer’s website, and on various portals it can only be downloaded through file hosting services, I decided to save your nerves and time by posting latest version(v2.0) by direct link. The program runs under the operating Windows system XP/7 (32-bit).

I will not describe the testing tools in this program, because, firstly, they are intuitive, and secondly, they work on the principle of the previous program.

So that you can see how easy it is to use Nokia Monitor Test, I specially posted a demo video.

In conclusion, I will say that with the help of these programs for broken pixels, you can check not only the monitor, but also the TV (you will need to connect it to system unit or laptop).

The other day I remembered how I bought a monitor in a store a couple of years ago. I then read a bunch of articles on how to choose the right monitor, how to find dead pixels, what color reproduction should be, etc. Most of the authors of the articles advised uploading good juicy photos to your USB flash drive, the Nokia Monitor Test program and go with this "gentleman's set" buying a monitor...


Now, thinking back to all this, I wondered if it was possible to simplify this whole process of preparation and go to the store light, but at the same time be sure that you will choose a quality monitor. And I found a way out online service.

He will provide you with all the necessary monitor tests before the purchase. Now you don’t have to drag anything with you to the store - just ask the seller to type the address of the specified service in the browser, and you will be armed to the teeth)).

I’ll tell you about the possibilities for testing the monitor this online service provides. You can choose from three job options:

  • "Html Window" - run tests in a browser tab
  • "Html FS" - run tests in a separate browser window with a resolution of 1280 × 1024 px
  • "Executable Mode" - you can download tests in the form Windows applications and run them directly from your computer.

All these options are absolutely equivalent, so choose which one suits you best.

Immediately after starting the test, a page with a picture will open to check the monitor's ability to display close shades. On high-quality monitors, a two percent difference in dark tones can be discerned.

To switch to other modes, you must move the cursor to the top edge of the browser window. A translucent menu will open, in which other monitor tests will become available.

color range

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

Trailing

Test of the real response speed of the matrix. There are 6 test options available.

homogenuity

Checking the uniformity of the backlight of the monitor lamps and checking for dead pixels. You can fill the monitor screen with five different colors.

1:1 pixel mapping


A test for the presence of divorces, the so-called moiré.

Text

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 to you if you work 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.

Friends, I hope you liked this online monitor test. When you are about to go to the store for a purchase, do not forget to use it to choose a good quality copy.

Often when purchasing a computer, we pay more attention to one part of it - the system unit, reducing the importance of the other - the monitor. But a flawlessly working monitor, configured in the right way, is very important not only for maintaining visual acuity, but also for a comfortable pastime at the computer. Checking how the monitor works is important both before buying and in the process of using it for its correct settings.

There are usually no problems with checking for external flaws. But how to find out about the presence of a hidden marriage? After all, the most common defects are associated with the operation of the monitor matrix, for example, the presence of dead pixels or a slow matrix reaction speed, which you will not notice at first glance. For this purpose, special programs have been developed, as well as online services that can quickly and accurately test the monitor. One of the most popular monitor checking programs is the utility. Its convenience is that it does not require installation, just download the file with the program, and the interface is intuitive and simple. There are several tests in the arsenal of the program that need to be run sequentially.


The first of the tests - "Shaded Screen" - is to fill the screen alternately with different colors, which allows you to identify pixels that do not respond to color changes - they will glow white or black. The following tests are designed to test the monitor's reproduction of color gradations ("Diagonal", "Step Gradient"), image clarity ("Lines", "Grid", "Circles", "Patterns") and readability of text, as well as the response speed of the monitor's matrix ( "Moving Square"). Evidence of the slow reaction rate of the matrix is ​​\u200b\u200bthe "tail" that appears when the square is moved. The disadvantage of the TFT-test utility is that it is not always possible to worry in advance and take the program saved on a USB flash drive with you to the store. In such a situation, the Online monitor test resource comes to the rescue, the capabilities of which can be used directly in the store by opening the desired web page. On the home page there is a menu where you need to choose how it is convenient for you to carry out testing: HTML-Window - the page with the test will open in the current browser tab; HTML FS - a new window will open; Executable mode - an option that allows you to download the program to physical media and then not use the Internet; Input lag test - designed to test the operation of two monitors working in pairs. It is also possible to test a smartphone, tablet or TV. Run the test and immediately you will see a black and white scale, allowing you to check how grayscale is displayed. To continue, move the mouse pointer to the top of the screen - a pop-up menu will appear with various tests. By the way, there is also a hint window with explanations for each test, however, only in English.

When buying a monitor, laptop or TV, there is an indicator that is not advertised by the seller, and most buyers do not pay attention to it. And only after the acquisition, they may wonder what kind of colored or black dots on the screen they are. As you know, the screen consists of dots - crystals, each of which is able to change color depending on the signal applied to it. This is how the picture is formed on the screen. There are situations when a crystal either cannot change color from the original black color, or, having received one color, is not able to change it to another. It's time to figure out what a check for dead pixels is, how to detect them and how to deal with them.

Visual inspection - nothing could be easier

The easiest and fastest matrix check for broken pixels monitor screen or TV is a visual inspection while turning on the device and playing a color, dynamic video. If the screen matrix has a broken pixel, it is easy to detect, just look at the screen. Pay attention to the dots that do not change their color during video playback. The color of these dots can be white, black, red, blue or green. Many stores whose main focus is the sale of television and audio equipment have special generators available, whose tasks include checking for dead pixels. The test consists in applying a sequence of color fills for a certain period of time, which allow detecting a matrix defect.

Built-in testing program - a step towards the buyer

Over the past few years, well-known manufacturers, trying to please the buyer, have added specialized functionality to their TVs. Checking for dead pixels on the TV is done with a single button. When the program starts, the screen will display certain sequence colors, when changing each, you can see on the screen dots that did not have time to change their color. For TVs that do not have a function to check the screen for dead pixels, you can use other methods of checking. For example, launching a special video from an external storage medium or connecting a TV to personal computer or a laptop as a second monitor in order to perform a software check.

Specialized pictures and videos will help

Buying a TV, laptop or monitor is often a pre-planned purchase. Reviews on the Internet and popular publications are studied, a list of necessary specifications- it takes more than one day. Checking for broken pixels of the screen matrix can also be scheduled by the buyer in advance. When buying such an expensive device, you can always find an hour of time to record a set of special pictures or test videos on the portable memory module, which are stored in huge volumes on the Internet. For example, a video testing the quality of changing dynamic scenes called "Japanese Woman on a Rope". If watching a video causes discomfort - the image doubles, the image of the trees and the girl's clothes is blurred, then the TV has failed the test. It is important to remember that testing and checking for broken pixels on a TV, monitor or laptop is incommensurable in time with what will be spent on warranty repairs or product exchanges.

Programs for testing

Checking the monitor for dead pixels can be done using a third-party software. Do not forget that due to the presence of additional video inputs on the TV, you can connect it as a monitor to a computer or laptop by testing, which is no different from testing a monitor. There are many such programs today. There is a complex check that detects dynamic video distortions, determining the response time of the matrix, and a regular check for dead pixels. The program for any testing does not take up much space and will fit on any storage medium. TFTTest, DeadPixelTester, Nokia Monitor Test and the popular online test tft.vanity.dk have proven themselves among screen matrix testing applications. The test of any device is carried out only with the installation recommended by the manufacturer screen resolution.

Pitfalls that few people know about

Checking the monitor for dead pixels is fundamental, but does not address some of the other pitfalls that a user may encounter when purchasing a device. Most LCD screens have factory defects that the average user is unaware of, attributing this to poor-quality video recording.

  1. Tint - white balance. To identify this defect, you need to display a static white sheet on the device screen. Stripes, spots of different shapes and shades will indicate the presence of a defect.
  2. Banding - appears on a static background of any color in the form of light and dark stripes.
  3. Lights that are typical only for LED TVs. They are detected in a dark room when either a black picture or white text on a black background is displayed on the screen. Light on a black background has white blurs. If the background is black with text, then the text itself is blurred.

But what about the guarantee?

Yes, you can exchange equipment under warranty, but there are some requirements that you need to know.

  1. If within fourteen days from the date of purchase of the device, broken pixels were found, you can, without a twinge of conscience, if you have a purchase receipt, return the equipment to the seller, hiding behind the law "On Protection of Consumer Rights".
  2. Using the manufacturer's warranty, you can exchange equipment in the store, according to the classification. For first-class devices, such as the Pioneer and DreamVison brands, one dead pixel is enough. For devices of the second class, such as Panasonic, Sharp or Hitachi, a check for dead pixels should show from 5 to 10 defects. The most popular third class with well-known brands LG, Samsung, Philips, Sony requires a minimum of 50 dead pixels.

Do not despair - massage can solve the problem

If it was not possible to exchange the device under warranty, you can try "handicraft" ways to eliminate dead pixels. There are two ways to solve the problem.

  1. Having previously determined the location of the dead pixel and disconnected the device from the network, you can try to restore the operation of the crystal using physical massage cotton swab defective area. The probability of recovery is low, but sometimes eliminates factory defects.
  2. Using special program if a check for broken pixels showed a defect, you need to connect a monitor or TV to a computer and try to restore the operation of the crystal with a hardware massage. Manufacturers of massage programs claim that there is a high probability of solving problems. As an example, such programs include Bad crystal, JScreenFix, Pixel Repair.