When buying a monitor, checking for broken pixels is not a redundant procedure. What is a broken pixel and why should it be checked? For buyers who are far from the intricacies of production and operational characteristics of LCD screens / monitors / TVs, all this sounds unusual and incomprehensible.
An LSD monitor consists of small dots (pixels) that reproduce light and color. A dead pixel is a defective pixel that does not work properly. It either does not work all the time (black dot), or constantly lights up in the same color (white, blue, red or green) regardless of the color of the image. Checking for broken pixels allows you to see a defect prior to purchase and require the seller to replace defective goods. Ignoring the check allows some unscrupulous sellers to sell obviously defective goods to inexperienced buyers.
Checking the monitor for broken pixels is actually an absolutely easy and simple procedure. It's true. It’s enough when buying to have a USB flash drive with a program for checking for dead pixels and a few seconds of time to start this program. After installing the program in a few minutes you can see what exactly you will pay your hard-earned money for. As a rule, any seller who values his reputation will not interfere with the verification process.
A few words about what the program should be. To check for broken pixels, there are mountains of software. It works very simply. After installing and starting the program, the entire area of the monitor glows in one color. Checking the monitor for broken pixels is a simple click on the left / right mouse button. This press changes the color of the monitor. When changing colors, it is possible to see defective (broken) pixels.
It makes no sense to list all existing programs for checking dead pixels. Any search engine for the request "check for broken pixels program" will return several hundred pages that have download links. Choose any, download, test and then throw it on a USB flash drive. In the store, she will provide you invaluable help, save money, time, a bunch of nerves.
Why is it important to check BEFORE a purchase? Indeed, the law is on the buyer's side, and according to the law, goods can be returned or exchanged. Yes it is. However, the seller is not always willing to exchange, referring to the standard ISO 13406-2, which allows a certain number of dead pixels and this is not considered a marriage.
The most interesting thing is that it is true. This standard prescribes the characteristics that an LCD monitor should have (brightness, color, uniformity of backlight, etc.). One of the parameters is the allowable number of defective pixels. "Fifteen" - no more than two defective pixels, 17-19 inches - no more than four, 21 inches or more - no more than six.
LCD panel makers are naturally familiar with these numbers. And, based on this, there is a division of LCD matrices into quality classes: the first class does not contain dead pixels at all, the fourth allows 256 defective units. Please note: branded manufacturers do not produce monitors lower than the second class. Accordingly, the "no-name" of the product can be of any quality. Checking for broken pixels in this case is simply necessary.
While your money is still in your pocket, the seller will make every effort to do you good: tell, show, test with you, replace (if necessary), or pick up another model. But as soon as you paid the money and took the goods - the degree of tenderness is rapidly falling. You may not recognize the dearest seller. Intentional misrepresentation of information, free interpretation of regulations and acts, references to non-existent documents may be used. To restore justice, you will need to butt with stubborn "managers", and even after that it (justice) cannot always be restored.
Checking for broken pixels is not a whim. This is a justifiable need, which will help to make the purchase and further use of the monitor as pleasant as possible.