Screen Defect

Monitor and screen tests

Dead pixel, stuck pixel, backlight and uniformity tests for any monitor or laptop, with a stuck-pixel fixer.

White screenBlack screenGrey screenRed screenGreen screenBlue screen
White screen⛶ Full screen
On whitedark spots, pressure marks, lines
On blackbright dots, backlight bleed, glow
On red, green, bluedead or stuck pixels, colour lines
Dead pixel testA dead pixel is a pixel that stays black on every colour: its transistor has failed and it never lets light through.Depends — see test

Not sure which one you have? Open the full-screen test, step through white, black and grey, and match what you see: a mark on every colour is in the panel; a mark only on light colours is a shadow on the backlight; a bright spot only on dark colours is a loose backlight reflector; lines that change when you tilt the lid are the cable.