LCD monitors have certain quality standards that allow the presence of a few defective pixels on the monitor. Therefore, it is important to detect such pixels before paying for the monitor, since the seller may refuse a refund if the number of dead pixels does not exceed the standard.
Necessary
test utilities for checking
Instructions
Step 1
Set the standard resolution in the monitor settings. LCD monitors perform differently at different resolutions, each with the optimal resolution recommended by the manufacturer. If you plan to use a different screen resolution than what is indicated optimal for this monitor model, then it is better to pay attention to other models or repeat testing later for the preferred resolution.
Step 2
Surely the seller of monitors has a program that allows you to evenly paint the screen in different colors. When turning on each color, carefully examine the screen, look for dead pixels. There are three types of faulty pixels: always lit (white or colored, respectively, they are clearly visible on a black background), always unlit (black, they are detected on a white background) and incorrectly displaying color.
Step 3
If there is no test program, then ask the seller to restart the computer with the monitor connected to it, carefully study the screen during the restart. At this point, on a black screen, you can see white dead pixels, and when starting the operating system, pay attention to black dead pixels. If there are any, then you can more easily find them in a familiar picture.
Step 4
On a black screen fill or when you restart your computer, also pay attention to the uniform illumination of the monitor. Black should remain black over the entire surface.
