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In case of you want to check for any such non working pixel in your monitor, try using theDead Pixel Locator software.

If you see any dead pixel on your LCD Screen, there are quite a few things you could do at your home or office.

How To Repair Dead Pixels on LCD Monitor

# 1) JScreenFix is an online tool to fix Dead Pixels Easily.

The tool launches a small applet in a separate browser window and you can drag the window to the respective spot or run it in full screen. The app could fix dead pixels with in under 20 minutes.

#2) Turn off the monitor. Now apply mild pressure over the pixel area and then rub the area around the stuck pixel with a soft  microfiber cloth. This is important because there is a big chance of scratching your LCD Screen surface if you other clothes which have rough texture. Now with the pressure applied over the pixel area turn on your monitor. The dead pixels might be gone when you turn on the monitor.

If the pixel is still stuck on your screen and does not go  even after trying the above mentioned methods, you could contact the manufacturer for a replacements if the warranty claim permits so.