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A dead pixel is a pixel that stays completely black or unlit because it no longer receives power—it's permanently off. A hot pixel, on the other hand, is always bright, usually showing a fixed color (red, green, or blue), because it’s stuck “on.”

Key difference: dead pixels are unlit, hot pixels are permanently lit.

Dead pixels usually indicate hardware failure, while hot pixels can sometimes appear temporarily due to heat or pressure and may disappear after a while. Both affect image quality but in opposite ways.

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