How to check the TV matrix for performance

Modern TV production technologies do not stand still. The technology is becoming more advanced and reliable. But even despite this, manufacturing defects or damage received during transportation are quite common. Therefore, when purchasing equipment, you should carefully check its most important part - the screen.

How to check the TV matrix yourself

In a household appliance store, it is quite difficult to determine the malfunction of the image matrix, since sellers demonstrate quality by showing rich and bright pictures, the performance test will be incorrect. In this case, you should ask store employees to show different images.

If, suddenly, extraneous multi-colored stripes appear on the screen, black circles, or the picture begins to freeze or disappear, all this will indicate problems in the operation of the TV matrix. Visually, when purchasing, technical problems can be identified as follows:

• Illumination unevenness. If, when the screen is filled black, highlighted spots appear, you should ask to see another copy of the equipment;
• Colored spots. The appearance of pink or greenish spots on a white monitor also indicates a malfunction of the matrix.

Reasons for dead pixels

The image on the screen is formed using small squares - pixels. Each pixel includes three small ones - red, green and blue. They give us millions of different shades.

If one of them is faulty, it is called “broken,” then the quality of the output image can be seriously affected. Experts divide problem pixels into 4 types:

• "Dead." These squares do not light up and are displayed as a black dot on a white screen;
• "Hot." Here there is a complete inversion - they glow white on a black background;
• "Stuck." The dots can be any color from the rainbow set;
• "Defective group." As a rule, this is a square of 5x5 pixels.

Such defects arise as a result of a violation of the technological process during production, simply put, a manufacturing defect. Also, destruction is possible due to an accidental impact on the screen or strong shock when moving equipment. Problems may arise after hypothermia, moisture ingress or power surges.

Acceptable number of damaged pixels

Manufactured displays vary by grade, and the international quality standard ISO 13406-2 sets standards for the number of dead pixels per million units.

• 1 class. Does not allow any problematic elements.
• 2nd Grade. Allows 2 “highlighted” and 2 “black” elements. Multi-colored dots up to 5 units.
• 3rd Grade. 5 white dots. 15 black and 50 different colors.
• 4th grade. Allowed 50 - 15 - 500 respectively. The presence of groups of 5 units is also allowed.

The screen class can be found in the technical documentation supplied with the TV.

How to check for dead pixels

A more accurate check for damage can be done at a service center or independently using special programs.

First of all, you will need special pictures to identify “broken” areas. They are standard for all types of screens and are posted on the websites of equipment manufacturers or on specialized forums. After downloading the images to a portable storage device, you need to connect it to the TV via a USB connector, and displaying the pictures one by one, visually looking for damaged areas.

Programs that test the display using a special algorithm require connecting the TV to a computer. Based on the test results, information is provided about problems and compliance of the amount of damage with accepted standards.

If “broken” pixels appear on the screen already during operation after purchase, do not be upset. Most problems can be fixed either independently, using special software, or at service centers for repairing household appliances.

Subject to proper operation of television equipment, and this:

• The presence of a voltage stabilizer in case of fluctuations in the network;
• Using equipment in a dry room;
• No mechanical impact;
• Being in the cold.

In these cases, the TV will last a long time without losing image quality.