Nastroyvse continues a series of articles on methods for identifying and treating dead pixels on various technical screens. The second most important device after a laptop or computer is an LCD TV. And as if the technique was not improved, the problem of dead pixels is still relevant.
Methods of testing the TV for broken pixels.
What are pixels
Creating a liquid crystal display is a complicated and time consuming business. It is better to learn about its assembly from the thematic programs “How it is done” on Discovery TV channel. Perhaps we will have such an article in speed. LCD screens have firmly entered the life of the man in the street and are gradually replacing devices with cathode-ray tubes due to a number of significant advantages:
- They require less space, making the TV thinner;
- They conduct electricity better and better, which means they give the best video signal;
- Less impact on the environment and viewers due to lower radiation levels.
The principle of the LCD-panel such. The radio waves converted into a light electric flux pass through a whole system of nodes — a polarizing filter, a thin-film transistor, a color filter panel, until it reaches a layer of liquid crystals or plasma with a typical backlight module. The value of the input signal determines the final color that sees the eye of the viewer on the outer matrix of the display. The entire outer surface of the matrix is divided into small dots called pixels. It is these crumbs of various shapes that take on the visualization of the change of orientation and the constant movement of liquid crystals under the action of an electric field. Pixels are invisible to the human eye. But in the event of certain conditions, they can turn from friends of the viewer into interference with watching TV. Thus, in the midst of the broadcast of night scenes, red dots suddenly appear. Or blue on a light background. Such fragments are called beaten.
Causes of dead pixels
The number of pixels is in the millions, which is why it is impossible to guarantee the performance of each. For a number of reasons, some crystals seem to freeze and do not change their orientation, being substituted for different subpixels of primary colors. The main reason for this phenomenon is the failure of the control transistor, which is why a pixel transmits only one color. The chance of treatment depends on the color of the subpixel. If it is red, blue or yellow in different shades - it is easy to reanimate the patient. For treatment using software and physical methods. By the way, have you ever done a massage ... a monitor or a TV? And they sometimes need it. But more about that later.
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 begin to flicker, and then completely darken or brighten. Regardless of the total, this pixel can be safely ordered to the requiem service. Replace the item is almost impossible without factory conditions. But there is no evidence of this practice. Broken pixels are big sneaks. They can either suddenly appear, or leave in English or drag the neighbors behind them. But the main thing - even the new TV may already have defective pixels. This is allowed by the international specification ISO 13406-2, which formed the basis of the state standard GOST R 52324-2005. According to the document, TV displays are divided into 4 classes. The standards for broken pixels per million pieces are as follows:
- 1 class - dead pixels are not allowed. We noticed one such - require the replacement of the panel at the expense of the manufacturer. On the market are represented by a small number of piece series of exclusive screens.
- Class 2 - no more than two black or white pixels on the opposite background, or five color pixels. The most popular in the market of Russia and the Commonwealth countries.
- For the third class, 5 white dots on a black background, 15 black on white or 50 color dots are allowed.
- Grade 4 has standards that are ten times higher than the third grade.
The assignment of the display to one of the types does not guarantee the high cost. At one manufacturer, a class 1 LCD panel can cost three to four classes and vice versa. A similar remark applies to other characteristics - impact resistance, density, and the like.
Check TV for image defects
Methods for checking the TV display are almost the same as those of a laptop or personal computer monitor. True, not done without a "but." To control the software methods need a system unit or a laptop with a network connection and the settings of the second monitor. But the store is taboo. Instead, you will be offered the service of checking the matrix for money. But why overpay if there is a cunning method. It is enough to download images of gradient backgrounds and videos to check the TV. Then write them to removable media - a USB flash drive, a memory card. You can ask the sales assistant to check the connection of the flash drive or memory card. Next, connect the prepared media and check. White is clearly visible on black, black on white, red will cut blue or green and so on.
We treat pixels
Methods of treatment can be divided into laboratory, software and physical. The first category does not make sense to consider - it can only be done by experts. And the other two deserve much more attention.
Many manufacturers offer proprietary software solutions to identify and eliminate dead pixels. If possible, use them better. Android TVs have a wider range of alternatives due to compatibility with the Play Market online store. Other models can be connected to a computer or laptop. Ideal if the TV will be the main monitor. Then with its help it is convenient to run regular applications of the PC operating system. Of the utilities for smart TV, we mention the Bad Crystal and JscreenFix. They are paid, but the price is low. Compared with other programs that restore a broken pixel in 48 hours, they eliminate it in minutes. Software systems eliminate 80-90% of all defects and reduce the rate of burnout of the device matrix. But in more severe cases, it is recommended to leave the software active overnight.
It consists in massaging the area around the broken pixel. It is better to do this with a soft fleece or ear stick, moderately pressing on the screen. It is very important not to overdo it, otherwise having cured one pixel, at least 8 neighboring ones will suffer. All actions are organized by the owner at your own risk. For this reason, it is not recommended to carry out the procedure on the warranty screens, since self-treatment threatens to lose the right to service under the service program.
This concludes the review of the reasons for the algorithm for checking and eliminating dead pixels on the TV screen. Nastroyvse wishes readers a high quality image with surround sound. Let broken pixels never become a hindrance to viewing your favorite content, wherever you are!