Trust but verify: we test the TV before buying. Going deeper into the details

Defective pixels

Check For Dead Pixels 4k TV

A completely inoperative pixel is fairly easy to identify, but a partially defective pixel is much more difficult. Each pixel is formed from three subpixels (red, green, blue). If one of them stops working correctly, then the dot on the screen will glow in the wrong color. over, in order to catch saboteur, Sometimes you have to tinker. try to see the ill-fated point, for example, on the 50-inch screen LG 50UK6510PLB! Fortunately, you do NOT have to arm yourself with a magnifying glass: it is enough to prepare a USB flash drive with test pictures in advance, which will identify the pest in any color range. Rarely, but still there are pixels that work incorrectly only periodically (when the Adjacent point lights up with a certain shade). You can catch them using patterned pictures: with strIPes, a grid, evenly alternating shapes. Incorrectly functioning elements will stand out in the general row. For testing a 4K display, this selection of images will come in handy.

Backlight uniformity assessment

The full-screen black fill will allow you to evaluate the uniformity of the backlight. Necessary Please note the availability exposed areas in different parts of the display. Some differences are allowed on LCD TVs, but if white spots are clearly visible on a black screen, this is a reason to look for a more successful copy or another model. As in the case of broken pixels, most manufacturers DO NOT consider this a defect, so it will be almost impossible to exchange a TV based on uneven backlight.

Colored detection “stains”

White fill is just as important. Here it is required to assess the presence of colored “stains on the screen. most often they look like pinkish or greenish areas on an even white color (the so-called Tinto). This coloration, Appeared in the matrix, and will be present over the main image, therefore, devices with such a defect should be avoided. As in previous cases, many manufacturers will NOT consider the presence of stains sufficient reason to exchange or repair the TV. At the same time, it does not hurt to check for banding, which manifests itself in the form of strIPes of the second shade. When watching regular TV programs, it will be noticeable in uniform areas as you move the camera. To identify this drawback, you need to submit a uniform field of any color (gray, green, purple) to the screen from the same flash drive.

Technically, Tinto, flashing and banding is not a marriage or a breakdown. It is almost impossible to find an LED TV without them. But the intensity of the interference can be different. you should choose a device with minimally pronounced image defects.

Pencil test

Despite the assurances of marketers, drawing cosmic figures in the technical characteristics of the refresh rate, find honest A 100 hertz TV is still tricky today. If before buying it was not possible to accurately determine the matrix model and find out its real capabilities, a popularly known one will come to the rescue pencil test. For eGoProjection, a very light image, preferably white, must be fed to the display. Then take a pencil or any long and thin object and wave it in a semicircle 10-15 centimeters from the screen. If the individual contours of the pencil are NOT visible. flicker comments. If several pencils. the manufacturer clearly drew the zero to the real sweep frequency, and the flickering of this instance will tire the eyes during prolonged viewing. You can verify the effectiveness of such a test on the example of a 100 Hz display Samsung UE40MU6103UXRU, put it next to any 50 Hz model.

Sound check

It is NOT worth pinning high hopes on a 10-watt speaker squeezed into the slim body of a modern TV. Of course, the speakers with the Sony Bravia KDL40WD653BR bass reflex sound quite decent for their dimensions, but they cannot promise the level of a home theater. Therefore, it is enough just to check the sound for rattling using high-quality samples. In this case, it makes sense to test the smoothness of volume control from the remote control along with the instant mute function.

Checking the connectors

USB ports are simply tested with the same flash drive with pictures to identify dead pixels. If the TV has two or more connectors (as, for example, in the LG 43UJ630V), nothing prevents you from checking them all one by one. If you plan to use Smart TV with a keyboard and mouse, it is better to take them with you. It may turn out that even with a known good USB connector, the existing kit will be incompatible with the TV. Here you will either have to put up with it, or find a suitable replacement without leaving the checkout.

The headphone jack can be checked even with a smartphone headset. its capabilities are quite enough to get a general idea of ​​the performance of the 3.5 mm jack. Well, if you don’t want to bother with the management, then we take our wireless headphones and test the Bluetooth connection, since modern TVs are equIPped with such an interface. And to unfold the 49-inch screen of the Samsung UE49MU7000UXRU hanging on the wall every time you want to watch a movie with headphones is a dubious pleasure.

Network check

Ears on the crown

Upon receIPt of the package with the TV, please check:

Often the list of standard accessories is NOT limited to the remote control: for example, the Samsung UE43M5513AUXRU is equIPped with an angled antenna adapter, which will allow you to hang the TV close to the wall. In order to avoid unnecessary costs and loss of time, it is better to immediately check if everything is in place. If at this stage everything turned out to be in perfect order, and the body shines from protective films and seals, you can proceed to the main part. checking for operability.

  • Popular brands
  • Huawei
  • Samsung
  • Honor
  • Oppo
  • Realme

conclusions

Pixel treatment

Treatment methods can be divided into laboratory, program and physical. It makes no sense to consider the first category. only experts can do it. And the other two deserve much more attention.

Dead Pixel Tester

Popular free utility that allows you to test different monitors and displays. There is nothing difficult in how to see through the utility all the dead pixels on the TV. The sequence of the procedure will be as follows:

  • Run the application, not requiring installation;
  • Select a test mode from the Pattern menu;
  • Turn on the desired color in the Color Selector section;
  • To start the change of modes, use the Auto Color Cycle option;
  • Keep an eye on the screen so that dots do NOT appear on it, and not Corresponding backgrounds.

With the help of the Exerciser function, which is activated by a special button for scrap, it is possible to check SEPARATE parts of the display. A rectangular testing area is formed and can be moved around the screen.

Online services

If you are NOT sure whether it is worth conducting such a check, you can not even hesitate. This is highly recommended. This way you can diagnose problems in a timely manner and begin to fix them.

In total, there are several online services that can help identify dead pixels on a TV display. The most popular ones are:

  • It is enough to go to the site and call the button to start testing. There are 7 types of tests to choose from, as well as several test variations. Compared to many other sites, it uses a looping movie rather than static images. This makes it possible to find dead pixels, as well as check the speed of their update.
  • Vanity Monitor Test. A popular online service that is able to quickly test the screen and detect pixel problems. Testing is carried out using Special Pictures. The service has a top drop-down menu, where the required verification mode is selected.

Using the Presented tools, you can quickly test the television panel, and in parallel, the screen of a monitor, laptop, tablet, etc.

Ismylcdok

The program is distributed completely free of charge. The instruction appears immediately on the screen at startup. There is nothing complicated here. You just need to follow the recommendations.

The check itself is performed using the 4 main buttons on the keyboard, namely F2-F5. There are several test modes available. It is also worth noting the ability to display gradient and monochrome images.

Checking an LCD TV for dead pixels

Nastroyvse continues a series of articles on methods of detecting and treating dead pixels on screens of various equIPment. The second most important device after a laptop or computer is an LCD TV. And no matter how the technology improves, the problem of dead pixels is still relevant.

Checking the TV for picture defects

In total, there are 2 main methods of how to check the TV for the possible presence of dead pixels:

  • Visually;
  • Programmatically.

To begin with, it is recommended to perform a visual test of the TV, which does NOT require any additional programs and devices.

The bottom line is to display backgrounds in several standard colors. Namely:

  • The black;
  • White;
  • Red;
  • Green;
  • Blue.

It makes no sense to check with other colors. It is enough to use these 5 basic colors. It is with their help that stuck, burning and completely dead pixels are identified. Which ones will turn out in your case depends on the specific situation.

Program check

Now is how to check TV using special tools. There are 2 options here, which are relevant mainly for Smart TV, since there is an Internet connection on ordinary TVs. Accordingly, some solutions will NOT be able to be used.

There are more than one program for checking pixels. And they are mostly free.

The software verification method can be divided into 2 categories:

  • With the help of software;
  • Through special online services.

With their help, dead pixels are checked Not only on computer monitors and laptop screens, but also on a 4K TV.

Self-check of an LCD TV is possible using several popular programs.

Software solutions

Separately, it is worth considering the issue of how to remove the appeared dead pixels on the TV, using special software.

Here are the 3 most commonly used software tools:

  • Bad Crystal. Allows you to deal with the problem of freezing subpixels. It is enough to run the utility and activate the recovery mode. If possible, the program will return the pixels to normal performance.
  • Undead Pixel. A utility that has shown itself well in the issue of pixel resuscitation. To perform screen recovery and get rid of dead pixels on the TV, you need to launch the application and click on the Start button. A square will appear on the screen, which will change its color. The DragDrop function moves the square over the problem area. By constantly changing the color, the pixel is eventually restored. But if we are talking about completely black dots, it will NOT work to reanimate them.
  • Eizo Test Monitor. Works well on any device including TV panels. Includes 24 test images, allows you to optimize color settings and check for possible damaged pixels. The utility differs in that no configuration is required. The archive is simply unpacked and launched by double-clicking. Then the Start Test button is pressed, and the test begins. In total, the utility has 8 modes of operation.

Reasons for the appearance of dead pixels

The number of pixels is estimated at millions, which makes it impossible to guarantee the performance of each. For a number of reasons, some crystals seem to freeze and DO NOT change orientation, substituting for different subpixels of the primary colors. The main reason for this is the failure of the control transistor, which is why the pixel transmits only one color. The chance of healing depends on the color of the subpixels. If it is red, blue or yellow of various shades, the patient is easy to resuscitate. For treatment, program and physical methods are used. By the way, have you ever done a massage on a Monitor or TV? And they sometimes need it. But more on that later.

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Much worse is the complete failure of the control transistor. the so-called inverter. In this case, the pixel or the matrix as a whole will start dead, and then completely darken or lighten. Regardless of the total, this pixel can be considered non-working. It is practically NOT possible to replace a part without factory conditions. But there is evidence of this practice. Broken pixels are big cunning. They can suddenly appear, or leave in English, or carry away the neighbors with them. But the main thing is that even a new TV set may already have defective pixels. This is allowed by the international specification ISO 13406-2, which formed the basis for the state standard GOST R 52324-2005. According to the document, TV displays are divided into 4 classes. The only question is how many damaged pixels are allowed within one screen. The standards for dead pixels per million are as follows:

  • Class 1. dead pixels are not allowed. We noticed one such. Demand replacement of the panel at the manufacturer’s expense. On the market Presented by a small number of piece series of exclusive screens.
  • Grade 2. no more than two black or white pixels on an opposite background or five colored pixels. The most popular on the market of Russia and the Commonwealth countries.
  • For the third class, 5 white dots are allowed on a black background, 15 black dots on a white or 50 colored.
  • Grade 4 has standards ten times higher than the third grade.

Assigning the display to one of the types does NOT guarantee high cost. In one GoPro manufacturer, a class 1 liquid crystal panel can cost three class 4 and vice versa. A similar remark applies to other characteristics. impact resistance, density, etc.

conclusions

1) Check packaging and TV set:
– Carefully inspect the packaging of the TV for opening, make sure that the protective films on the packaging are intact and there are no traces of re-sticking, if there are traces of opening, I recommend refusing to buy this copy, most likely they want to sell the showcase copy as new without a discount, also inspect if there are dents or holes on packaging.
– Availability of complete set (remote control, cables, adapters, stand, documentation).
– Presence of factory (original) protective films on the TV case and stand,
There should be NO scratches and second damage, pay special attention to elements with polished metal or chrome plated elements.
– The presence of scuffs, chIPs, cracks on the TV, stand and remote control.
– The presence of tamper marks on the screws on the back of the TV, otherwise your future TV was already under repair.

2) Checking the operation of the TV:
– Connect the TV to the network and turn it on.
Check the functionality of the remote control from the complete set.
– SkIP the initial setup menu if possible.
– Connect TV cable
and make sure that the channel scan is working and shows the found channels.
Check the functionality of the outputs USB, SCART, HDMI, tulIPs and others.
Check your sound system, when viewing, smoothly increasing the volume, the sound should be clear without extraneous backgrounds and wheezing, if the speakers were overloaded or pierced.
– If there is a USB output, connect the flash drive, beforehand, test pictures will be uploaded to the flash drive at home and (more on this below, with an example of pictures for TVs with Full HD and 4K, ands).
– If the TV with Smart TV connect to the Internet via Wi-Fi, if there is no Wi-Fi via cable, make sure that the menu works, the application opens.

How to recover

But what to do if the TV has already been purchased and during the testing process they found a broken pixel, what to do in such a situation, we will figure it out further. Pixels can also be damaged as you use the TV. Immediately, we note that only colored dots can be normalized. However, their serviceability is only a temporary phenomenon. After a few days, the defect will appear again.

Going deeper into the details

Defective pixels

A completely inoperative pixel is fairly easy to identify, but a partially defective pixel is much more difficult. Each pixel is formed from three subpixels (red, green, blue). If one of them stops working correctly, then the dot on the screen will glow in the wrong color. over, in order to catch saboteur, Sometimes you have to tinker. try to see the ill-fated point, for example, on the 50-inch screen LG 50UK6510PLB! Fortunately, you do NOT have to arm yourself with a magnifying glass: it is enough to prepare a USB flash drive with test pictures in advance, which will identify the pest in any color range. Rarely, but still there are pixels that work incorrectly only periodically (when the Adjacent point lights up with a certain shade). You can catch them using patterned pictures: with strIPes, a grid, evenly alternating shapes. Incorrectly functioning elements will stand out in the general row. For testing a 4K display, this selection of images will come in handy.

Backlight uniformity assessment

The full-screen black fill will allow you to evaluate the uniformity of the backlight. Necessary Please note the availability exposed areas in different parts of the display. Some differences are allowed on LCD TVs, but if white spots are clearly visible on a black screen, this is a reason to look for a more successful copy or another model. As in the case of broken pixels, most manufacturers DO NOT consider this a defect, so it will be almost impossible to exchange a TV based on uneven backlight.

Colored detection “stains”

White fill is just as important. Here it is required to assess the presence of colored “stains on the screen. most often they look like pinkish or greenish areas on an even white color (the so-called Tinto). This coloration, Appeared in the matrix, and will be present over the main image, therefore, devices with such a defect should be avoided. As in previous cases, many manufacturers will NOT consider the presence of stains sufficient reason to exchange or repair the TV. At the same time, it does not hurt to check for banding, which manifests itself in the form of strIPes of the second shade. When watching regular TV programs, it will be noticeable in uniform areas as you move the camera. To identify this drawback, you need to submit a uniform field of any color (gray, green, purple) to the screen from the same flash drive.

Technically, Tinto, flashing and banding is not a marriage or a breakdown. It is almost impossible to find an LED TV without them. But the intensity of the interference can be different. you should choose a device with minimally pronounced image defects.

Pencil test

Despite the assurances of marketers, drawing cosmic figures in the technical characteristics of the refresh rate, find honest A 100 hertz TV is still tricky today. If before buying it was not possible to accurately determine the matrix model and find out its real capabilities, a popularly known one will come to the rescue pencil test. For eGoProjection, a very light image, preferably white, must be fed to the display. Then take a pencil or any long and thin object and wave it in a semicircle 10-15 centimeters from the screen. If the individual contours of the pencil are NOT visible. flicker comments. If several pencils. the manufacturer clearly drew the zero to the real sweep frequency, and the flickering of this instance will tire the eyes during prolonged viewing. You can verify the effectiveness of such a test on the example of a 100 Hz display Samsung UE40MU6103UXRU, put it next to any 50 Hz model.

Sound check

It is NOT worth pinning high hopes on a 10-watt speaker squeezed into the slim body of a modern TV. Of course, the speakers with the Sony Bravia KDL40WD653BR bass reflex sound quite decent for their dimensions, but they cannot promise the level of a home theater. Therefore, it is enough just to check the sound for rattling using high-quality samples. In this case, it makes sense to test the smoothness of volume control from the remote control along with the instant mute function.

Checking the connectors

USB ports are simply tested with the same flash drive with pictures to identify dead pixels. If the TV has two or more connectors (as, for example, in the LG 43UJ630V), nothing prevents you from checking them all one by one. If you plan to use Smart TV with a keyboard and mouse, it is better to take them with you. It may turn out that even with a known good USB connector, the existing kit will be incompatible with the TV. Here you will either have to put up with it, or find a suitable replacement without leaving the checkout.

The headphone jack can be checked even with a smartphone headset. its capabilities are quite enough to get a general idea of ​​the performance of the 3.5 mm jack. Well, if you don’t want to bother with the management, then we take our wireless headphones and test the Bluetooth connection, since modern TVs are equIPped with such an interface. And to unfold the 49-inch screen of the Samsung UE49MU7000UXRU hanging on the wall every time you want to watch a movie with headphones is a dubious pleasure.

Network check

Manual way

We put in physical effort. In this case, you need a cotton swab or an eraser on a pencil, gently massage the damaged area. To do this, we find all the Defective points, turn off the TV and already in the right place we carry out circular movements. However, even doing everything correctly, you can NOT achieve the desired result, but it is quite possible to damage neighboring elements.

Upon receIPt of the package with the TV, please check:

Often the list of standard accessories is NOT limited to the remote control: for example, the Samsung UE43M5513AUXRU is equIPped with an angled antenna adapter, which will allow you to hang the TV close to the wall. In order to avoid unnecessary costs and loss of time, it is better to immediately check if everything is in place. If at this stage everything turned out to be in perfect order, and the body shines from protective films and seals, you can proceed to the main part. checking for operability.

Types of defects and how many are allowed

The permissible number of dead pixels on a new TV is strictly regulated by the international standard ISO 13406-2. The document is quite voluminous, it describes in detail all aspects of the screen. over, there are 3 categories of damaged points in it:

  • Open. permanently glows white, cannot be restored.
  • Closed. dead pixels, always black, can be repaired, but in a service center.
  • Colored. the fault lies in the control transistor, as a result, the pixel glows in one of the following colors. blue, red, green.

With the special GoPro software, you can deal with the problem at home. In Samsung, and many other well-known companies, TVs are divided into four classes. Most of the produced TVs are of the second class. First-class devices should not have any defective points at all.

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Number of dead pixels allowed. How to check yourself

For the test, you will need a regular flash drive, you need to throw off monophonic images on it. white, black, green, etc. You need to start checking after the TV has been running for several minutes, since defects appear only on a heated matrix.

To start checking for dead pixels of the TV when buying, ask the seller to insert a previously prepared USB flash drive into the TV. After this display of the image. So, on a white screen, dark pixels will be clearly visible, and on a black one you can see white dots.

Special testing programs are also available. There are a lot of them, but most often they are used:

  • Dead Pixel Tester.
    Free application for a computer on Windows 7,8,10. The site also contains detailed instructions for checking, which is very convenient.
  • Dead pixel buddy.
    A site that has 9 color pictures that can be opened in full screen both on a TV / computer and on your mobile phone.
  • Injuredpixels.
    Another program with many settings and high resolution pictures for tests.
  • LCD DeadPixelTest.
    The easiest site to use. Everything is very simple, there are the names of the pictures, click on each of them and make it full screen.

In terms of application, the second application is simpler, and it was developed specifically for testing LCD screens. Highlights any area of ​​the screen in the desired shade. As a result, all defects can be quickly detected.

If you do not know how to check the TV using THESE programs, follow the instructions on how to connect a laptop to a TV. By doing this, you can transfer the image from the computer to the TV screen.

The concept of dead pixels, the reasons for their appearance

The number of pixels on the display is so huge that it is almost impossible to guarantee 100% serviceability. Often on the screen you can see completely fixed points glowing in one color, which, even with a change in the TV image, DO NOT change their color and location. It is these objects that are commonly called broken pixels. They can be black, white and colored. There are two reasons for the occurrence of THESE defects: imperfection of technology and normal manufacturing defects.

After the failure of the transistor that controls the liquid crystals, black ( dead) dots indicating NOT functioning cells. The subsequent management of these crystals is simply impossible. Such defects are most visible on a light background. Some experts consider them impossible treatment, others argue that with the help of a laser it is possible to partially restore the pixel to its working state.

The second reason is subpixel stuck in one position. This problem appears in the liquid crystal layer. Such stuck the object appears on the display as a white (burning) or colored dot. To eliminate this defect, you can use special programs or carry out a number of physical manIPulations. There are times when broken pixels, after a while, disappear by themselves.

Thus, when choosing an LCD TV, pay little attention to its appearance, the presence of numerous functions, ports, connectors. An important place is also occupied by checking the device for matrix defects. Let’s try to figure out how to check the TV before buying, and protect ourselves from purchasing low-quality equIPment.

How to check the screen for dead pixels visually

Installing a standard color grid on the screen is a dead pixel test, or rather stuck. The test is a grid of squares, strIPes, or a specially drawn drawing. Any test contains five primary colors, which allow you to find stuck pixels. Working with the checker program will help you determine if the dead pixels are dead or stuck. If stuck pixels are recoverable, then dead it will NOT be possible to restore.

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

  • Dead Pixel Tester,
  • Ismylcdok.

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

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

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

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

  • Painted areas,
  • Rectangles,
  • Vertical or horizontal sections.

All programs help to flash pixels in several standard colors.

When a dead pixel test is needed

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

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

  • How are they located,
  • What is the resolution of the monitor
  • Or what is the diagonal of the display.

For example, in LG, the regulations recognize the presence of 10 stuck and 3 dead pixels on a 20-inch screen.

Samsung guidelines predict 7 dead spots, while Dell predicts 6 stuck and 13 dead spots, depending on which display was found to be faulty.

Most typical brands of monitors or screens correspond to the second class. They also need to be checked for dead pixels. The check should reveal NOT more than 5 incorrectly working pixels.

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

Check for dead pixels

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

One of the most annoying disadvantages of monitors or LCD TVs is the appearance of broken pixels. Pixel. The smallest rectangular element with which an image is transmitted to the screen.

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

Each pixel has three subpixels:

  • Green,
  • Red
  • And blue.

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

Warranty service

  • Leave the production of screens at the same levels and produce products in the same volumes without increasing prices,
  • Buyers will use equIPment that has a certain percentage of dead pixels (these cases are NOT guaranteed).

How to check for dead pixels online

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

  • Monteon,
  • Vanity monitor test.

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

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

What dead pixels look like

This kind of violation might look like this.

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

Checking for dead pixels is necessary if the screen detects several defects in one of the areas. In some cases, defects are so noticeable that the size broken the plot is 10 points long and 10 wide. Sometimes broken pixels are lined up horizontally or vertically to form prominent streaks.

How to recover dead pixels yourself

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

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

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

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

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

In addition to using special GoPro software, you can perform pixel restoration in manual mode. But this method is only suitable for stuck or hot pixels. You need to take an ordinary cotton swab and gently press the black points of the screen with it. Then you need to wait 10-15 minutes. After this time, hot a pixel can work in normal mode, and if it gets stuck, it can come into balance with the rest of the points. But this recovery method can lead to matrix breakage. If you press the cotton swab too hard, then neighboring pixels will also die and the equIPment cannot be exchanged or returned.

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Checking the TV for dead pixels

Buying a new TV is a serious business, therefore it must be treated with full responsibility and knowledge of the matter. Experts recommend without fail to check the TV for dead pixels together with a sales assistant.

What is a pixel on a TV?

The TV receiver’s matrix is ​​made up of a huge number of tiny cells. These are the pixels. The image quality depends on the number of pixels: the more there are, the clearer the picture. Each pixel of a color TV, in turn, consists of subpixels: red, blue and green.

A cell that does not respond to a change in signal is a defect, which is called dead pixel. It appears as dots of the same color, which spoils the image displayed on the screen. The following types of pixel violations exist:

  • White pixel. constantly burning point;
  • Black pixel. non-functional cell;
  • Red, green or blue pixels. subpixel defect;
  • Simultaneous presence of two or three defects.

How to check pixels on a TV?

Checking pixels on a TV. The most difficult stage in testing a device before purchasing. The easiest test method is to inspect the screen when it displays a color. To find black dots, you should file a white field. Accordingly, to detect white points, a black field is supplied. To search for subpixel defects (colored dots), the screen color is changed alternately. With a close examination, even with the naked eye, it is possible to detect defects, but for a more effective inspection procedure for dead pixels, it is better to use a magnifying glass.

Broken pixel on TV: warranty

Unfortunately, it is often not possible to rent or exchange a TV with a dead pixel. The fact is that according to the existing international standard, each class of equIPment provides for the maximum permissible number of pixels with a defect. So, in accordance with the standards, pixel defects are not allowed only in first-class TV sets. The technique of the second. fourth classes is subject to exchange only if the established threshold of admissibility is exceeded.

Treatment of dead pixels on TV

Often, users of television equIPment, already during its operation, discover that a broken pixel has appeared on the television. We want to warn you right away that it is impossible to get rid of black dots on your own. Colored dead pixels can be fixed by yourself. There are two ways:

  • Massaging the defective area. For massage a cotton swab will do. It is necessary to accurately determine the location of the dead pixels, turn off the TV and press on this area for a long time. You need to repeat the steps several times.
  • Hardware massage. The treatment takes place with the help of Special programs for eliminating stuck pixels, which can be found on the Internet. The second method gives more chances heal screen, moreover, it is safer for the device. The utility developers claim that the defect can be eliminated in a few tens of minutes of program operation.

What to look out for before buying a TV and how to test your device

What is worth Pay attention to the purchase of a TV or monitor.

Monitor testing

When buying a monitor, TV or other device for displaying images, I want to make sure of its image quality. You can check the image quality only if we test the matrix of this device.

For testing, we need images that will help determine the quality of the image. Place images on any USB drive for their further GoPro viewing on a TV, monitor or any device with the ability to open files from a flash drive.

Images for the screen test are in the archives:

  • Screen resolution 19201080 1080p-size-1920 × 1080
  • Screen resolution 38402160 4K-size-3840 × 2160

Going deeper into the details

Defective pixels

A completely inoperative pixel is fairly easy to identify, but a partially defective pixel is much more difficult. Each pixel is formed from three subpixels (red, green, blue). If one of them stops working correctly, then the dot on the screen will glow in the wrong color. over, in order to catch saboteur, Sometimes you have to tinker. try to see the ill-fated point, for example, on the 50-inch screen LG 50UK6510PLB! Fortunately, you do NOT have to arm yourself with a magnifying glass: it is enough to prepare a USB flash drive with test pictures in advance, which will identify the pest in any color range. Rarely, but still there are pixels that work incorrectly only periodically (when the Adjacent point lights up with a certain shade). You can catch them using patterned pictures: with strIPes, a grid, evenly alternating shapes. Incorrectly functioning elements will stand out in the general row. For testing a 4K display, this selection of images will come in handy.

Backlight uniformity assessment

The full-screen black fill will allow you to evaluate the uniformity of the backlight. Necessary Please note the availability exposed areas in different parts of the display. Some differences are allowed on LCD TVs, but if white spots are clearly visible on a black screen, this is a reason to look for a more successful copy or another model. As in the case of broken pixels, most manufacturers DO NOT consider this a defect, so it will be almost impossible to exchange a TV based on uneven backlight.

Colored detection “stains”

White fill is just as important. Here it is required to assess the presence of colored “stains on the screen. most often they look like pinkish or greenish areas on an even white color (the so-called Tinto). This coloration, Appeared in the matrix, and will be present over the main image, therefore, devices with such a defect should be avoided. As in previous cases, many manufacturers will NOT consider the presence of stains sufficient reason to exchange or repair the TV. At the same time, it does not hurt to check for banding, which manifests itself in the form of strIPes of the second shade. When watching regular TV programs, it will be noticeable in uniform areas as you move the camera. To identify this drawback, you need to submit a uniform field of any color (gray, green, purple) to the screen from the same flash drive.

Technically, Tinto, flashing and banding is not a marriage or a breakdown. It is almost impossible to find an LED TV without them. But the intensity of the interference can be different. you should choose a device with minimally pronounced image defects.

Pencil test

Despite the assurances of marketers, drawing cosmic figures in the technical characteristics of the refresh rate, find honest A 100 hertz TV is still tricky today. If before buying it was not possible to accurately determine the matrix model and find out its real capabilities, a popularly known one will come to the rescue pencil test. For eGoProjection, a very light image, preferably white, must be fed to the display. Then take a pencil or any long and thin object and wave it in a semicircle 10-15 centimeters from the screen. If the individual contours of the pencil are NOT visible. flicker comments. If several pencils. the manufacturer clearly drew the zero to the real sweep frequency, and the flickering of this instance will tire the eyes during prolonged viewing. You can verify the effectiveness of such a test on the example of a 100 Hz display Samsung UE40MU6103UXRU, put it next to any 50 Hz model.

Sound check

It is NOT worth pinning high hopes on a 10-watt speaker squeezed into the slim body of a modern TV. Of course, the speakers with the Sony Bravia KDL40WD653BR bass reflex sound quite decent for their dimensions, but they cannot promise the level of a home theater. Therefore, it is enough just to check the sound for rattling using high-quality samples. In this case, it makes sense to test the smoothness of volume control from the remote control along with the instant mute function.

Checking the connectors

USB ports are simply tested with the same flash drive with pictures to identify dead pixels. If the TV has two or more connectors (as, for example, in the LG 43UJ630V), nothing prevents you from checking them all one by one. If you plan to use Smart TV with a keyboard and mouse, it is better to take them with you. It may turn out that even with a known good USB connector, the existing kit will be incompatible with the TV. Here you will either have to put up with it, or find a suitable replacement without leaving the checkout.

The headphone jack can be checked even with a smartphone headset. its capabilities are quite enough to get a general idea of ​​the performance of the 3.5 mm jack. Well, if you don’t want to bother with the management, then we take our wireless headphones and test the Bluetooth connection, since modern TVs are equIPped with such an interface. And to unfold the 49-inch screen of the Samsung UE49MU7000UXRU hanging on the wall every time you want to watch a movie with headphones is a dubious pleasure.

Network check

Photo to check the TV for dead pixels

A little about dead pixels!

It is not uncommon for LCD, LED and even OLED TVs to have defects such as Broken Pixel. It usually looks like a point in an arbitrary area of ​​the screen, of any color.
There are 4 types dead pixels:

Dead pixels are pixels that are off (always off). On a white background, it looks like a black dot.

Hot pixels. on the contrary, they are always on and on a black background they look like a white point.

Stuck pixels may glow red, blue, green or yellow. This is because some of the subpixels are always on or always off.

A group of defective pixels. These are several defective pixels in a 5×5 pixel square.

(Click on the image for a larger GoPro view)

Checking with a USB stick

Using the image data, you can check your TV for manufacturing defects such as:

  • Defective pixels;
  • Matrix highlights;
  • Uneven backlighting;

Using the built-in media player, scroll through all the pictures. the matrix defect will be much easier to notice!