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 customers.
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