The program for testing the TV for broken pixels. How not to get caught on a defective product?

Despite the fact that every year the technology of production of LCD TVs are constantly being improved, the risk of buying defective TVs with broken pixels is still there.
That is why before the transaction should be diagnosed with a plasma display for the presence of such "surprises". And today we will look at the program for testing the TV for broken pixels and how it can be used.

A few words about pixels

A pixel is the smallest detail of a digital image or display matrix. It is an indivisible object of a round (most often rectangular) shape. It is the pixels that form the image on the monitor or TV screen.

The very process of manufacturing plasma screens is very complex and time consuming, requiring high accuracy and costly tools. LCD displays are used in almost all digital devices. It can be cameras, mobile phones, laptops, PC monitors, TVs and navigators.

Crystals

The basis of plasma TVs and LCD monitors are liquid crystals. Through them, light is passed, from which the image is then obtained. Often, the outer layer of the LCD panel is made of glass. In this case, a thin-film transistor is placed between the polarization filters and the panel, as well as a layer of crystals with a backlight module inside. The latter can be either posterior or lateral. During the operation of the TV, light passes through the layer of crystals, which instantly converts into a finished image.

Subpixels

The pixel itself consists of several subpixels (blue, green and red). With the help of these LCD screen can distinguish millions of various colors and shades, the crystal molecule behaves as part of any liquid substance, that is, constantly in motion.

Diagnostic program for broken pixels on the TV

At the moment, there are two most popular utilities for diagnosing and checking LCD displays for "dead" pixels:

1. TFTTest.
2. DeadPixelTester.

It's quite easy to use them. Below we will tell you how the TV is checked for broken pixels from a USB flash drive with both programs.

So, we have a flash drive and TFTTest utility. First you need to write down the required software package. It should include both the program itself and a separate archive with a set of color fills and gradients with a resolution of 1920 x 1080 pixels. You can also download a set of videos, with which you can see how the TV perceives and displays a picture in 3D and the quality of the drawing (from 100 to 800 Hertz).

Next, install the USB flash drive into the USB connector of the TV. Using the control panel go to the menu and connect the drive. Next, choose to view photos by selecting pre-prepared color fillings. Most often in the archives there are 9 such fillings with yellow, black, white, green and other colors. Run the utility and take turns browsing through all the photos. If there are defects on the LCD, we will immediately notice them on the screen - they will differ in tint from the general background of the fill (or they will be automatically detected by the program to check the TV for broken pixels). It is also recommended to check the quality of the reproduced sound and the depth of the contrast of the picture itself. So you can accurately determine if this television is defective or not.

The program for testing the TV on broken pixels DeadPixelTester was also created to test LCD screens. Thanks to it, you can highlight any questionable areas of the screen with any of the suggested colors. To do this, the program to check the TV for broken pixels will require you to choose any color you like and check its display quality on the entire display area. In the event that a broken pixel is detected, you can go to the window with 5 basic shades. So you study the suspicious area in more detail.

How much does a professional check for broken pixels of the TV

Strangely enough, but in electronics stores you can be offered a professional diagnosis of the TV for such defects. There is nothing distinctive in it - all actions are similar to those that you produce with your own hands. True, for this you will be required from 600 to 1000 rubles. For self-testing, you only need a USB flash drive and Internet access, where you can download the necessary utilities and fill colors.

The broken pixels are the norm or not

In fact, manufacturers allow entry to the market for defective TVs, however, their concentration of 1 million pixels should not go beyond certain limits. Liquid crystal displays of the first class at all do not admit presence of similar defects. Most often these are very expensive and rare TV models that are not very popular and in demand on the world market. The second class admits the presence of not more than two I and II type defects per one million pixels. This class is the most popular on the Russian market. The third class allows the presence of up to 5 bit pixels of I and II sorts, as well as up to 50 III grade. The fourth can contain up to 500 defects of various types, but such TVs have not yet been found in Russian electronics stores.

So, we found out how the screen is checked for broken pixels, and what is the norm of their content in TVs of different types.