If one of the pixels of your LCD screen is constantly showing the same color then that pixel is stuck and needs some care. But don’t directly take it to your manufacturer as I will tell you some tips with which you can repair them:
1) Try using a software that rapidly turns on and off the pixels in an attempt to re-energize stuck pixels. If this way fails then you can try u the following steps.
2) Turn off the monitor.
3) Get a damp cloth so that you don’t scratch the screen.
4) Apply pressure on the area where you are having the stuck pixel.
5) Turn on the monitor at the same time.
6) Remove pressure and the stuck pixel should be gone.
Remember this works only in case you have a stuck pixel and not a dead one. A dead pixel appears black but a stuck pixel constantly shows the same color.
Via: wikihow
