How to Dead Pixel Test?

First, make sure your screen is clean.

No "dead pixel test" can automatically show you the dead pixel dot, so you should do this test carefully by looking at the screen.

To start the test, press “Switch to Full Screen” below — the color cycle will not begin until you are fullscreen.

Sample dead pixel image

For example, a different shade of color appeared in the form of a dot in the middle of the "green" color.