How to check if a display has a dead pixel?
When using a bright or colorful screen, a dead pixel will be obvious as it will remain dark or unresponsive. A few users may mix up stuck pixels with dead pixels, though stuck pixels tend to display one color rather than black. You can perform a pixel test on your screen to verify the problem, or on your cell phone. Several dead pixels could make the display look poor and might require professional repair or replacement.
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