On this page you can test yourself with little effort, how many defective pixels are on your laptop. The quick test runs first through black and white, followed by the three primary colors cyan, magenta and yellow.
Here you can now, on closer observation, to determine whether the LCD has dead pixels.
This is a test page and the results are not guaranteed.
If you start the test press the [F11] button, so the entire screen is filled full with the colors. After the test, you go back with pressing the [F11] button and return to your normal browser windows.
Run the test...