Dead Pixel Test
Online dead pixel test: cycles through black, white, red, green, blue and grayscale solid full-screen colors in turn to help find bright, dark and dead pixels on a monitor—a staple for checking screens when buying.
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Checks LCD / OLED screens for bright, dark and dead pixels; colors cycle through black, white, red, green, blue and grays. Raising the screen brightness is recommended for more accurate results.