Modern technology for the production of televisions does not stand still. The technique is becoming more advanced and reliable. But, despite this, quite often there is a manufacturing defect or damage sustained during transportation. Therefore, when buying equipment, you should carefully check its most important part - the screen.
How to check the matrix of the TV yourself
The content of the article
- How to check the matrix of the TV yourself
- Causes of Dead Pixels
- Allowed number of corrupted pixels
- How to check for dead pixels
In a home appliance store, it’s quite difficult to determine the malfunction of the image matrix, as sellers demonstrate quality, showing rich and vivid pictures, a performance check will be incorrect. In this case, you should ask the store employees to show different images.
If, suddenly, multicolored stripes, black circles or a picture appear on the screen will begin to freeze or disappear, all this will indicate problems in the matrix TV. Visually, upon purchase, technical problems can be identified as follows:
- Uneven backlight. If backlit spots appear during the black fill of the screen, then you should ask to show another copy of the technique;
- Color spots. The appearance of pink or greenish spots on a white monitor also indicates violations in the matrix.
Causes of Dead Pixels
The image on the screen is formed using small squares - pixels. Each pixel includes three small ones - red, green and blue. They convey to us millions of diverse shades.
If one of them is faulty, it is called “broken”, then the quality of the displayed image can seriously suffer. Experts divide problem pixels into 4 types:
- "The Dead." These boxes do not glow and are displayed with a black dot on a white screen;
- Hot. Here is a complete inversion - on a black background they glow white;
- "Stuck." Dots can be any color from a 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, factory defects. Also, destruction is possible with an accidental hit on the screen or a strong shock when moving the equipment. Problems may occur after hypothermia, moisture or power surges.
Allowed number of corrupted pixels
Displays are divided into classes, and the international quality standard ISO 13406-2 sets the standards for the number of “broken” pixels per million units.
- 1 class. Does not allow a single problem element.
- Grade 2. Allows 2 "highlighted" and 2 "black" elements. Multi-colored dots up to 5 units.
- Grade 3. 5 white dots. 15 black and 50 different colors.
- 4th grade. Allowed 50 - 15-500 respectively. The presence of groups in the amount of 5 units is also acceptable.
The screen class can be found in the technical documentation that came with the TV.
How to check for dead pixels
A more accurate check for damage can be checked at a service center or independently using special programs.
First of all, special pictures will be required to determine the “broken” sections. They are standard for all types of screens and are posted on the websites of manufacturers of equipment or on specialized forums. After downloading the images to a portable information storage device, you need to connect it to the TV via a USB connector, and displaying the pictures in turn, visually look for damaged areas.
Programs that test the display using a special algorithm require connecting the TV to a computer. According to the test results, information is given about the problems and the compliance of the amount of damage with the accepted standards.
If the "broken" pixels appeared on the screen already in the process of operation after the purchase, do not get upset. Most problems can be fixed either on their own, using special software, or at service centers for repairing household appliances.
Subject to the proper operation of television technology, and this:
- The presence of a voltage stabilizer, with its drops in the network;
- Use of equipment in a dry room;
- Lack of mechanical impact;
- Being in the cold.
In these cases, the TV will last a long time without loss of image quality.
