When buying a LCD TV you can get all the instance with beaten pixels on the screen. Return this TV in the store will not be easy.
It is therefore important to know how to check your TV on dead pixels before buying.
Pixel called cell participating informing an image on the screen. The main pixel consists of three subpixels: green, red and blue. By combining these colors, you can seek out the different shades and colors.
When the matrix is OK, the picture on the screen without defects. If a pixel or a transistor that controls them is damaged, there is a defect, which is called "broken pixel."
Broken pixels are unlit and burning. Unlit pixel appears as a black dot. Burning pixel is solid white. They manifest contrasting background. Another defect - broken, or "stuck" subpixel. It manifested glow one of the primary colors - blue, green or red.
Why check the TV on dead pixels
The presence of dead pixels does not affect the overallTV operation. Most manufacturers allows a certain number of defective pixels on the screen. This amount depends on the class and the monitor is usually stated in the warranty documentation.
If you do not check out when buying a LCD TV andonly at home to detect the presence of broken pixels, return this unit to the store will be very difficult. If the number does not exceed the standards set by the manufacturer, the TV will not be accepted and the service center.
The manufacturer does not consider this a fault orbreakage. A recovery of dead pixels in most cases impossible. Therefore, check the TV directly into the store, where you will be able to withdraw from the purchase if you find a defect.
How to find dead pixels
Testing for dead pixels is quite simple. Since defective pixels have a constant color, they are well appear on a contrasting background. You will need to display multiple series of color fills.
How to do it? It is advisable to connect the TV to your PC or laptop. This will allow you to use a special program to check the monitors and televisions. Also check for dead pixels, these programs allow you to check a number of other important parameters. The most popular program for this purpose - TFTTest.
Not all stores will go to meet you andprovide computer. Of course you can bring your own laptop. But if you have selected the TV model is equipped with a USB interface, it is sufficient to take a USB stick. Record video at him with a succession of colors or just the right image with the fill different colors.
Connect the drive to your TV and startvideo or viewing pictures. As the playback of different colors carefully inspect the entire screen area. Dead pixels, if any, will manifest themselves in the form of contrasting points.