How to Fix a Dead Pixel

Defective pixels are a very annoying drawback to liquid crystal displays and unfortunately can strike at any time (even on new monitors).

ISO 13406-2 (Ergonomic requirements for work with visual displays based on flat panels) categorizes three different types of defective pixel:

1. Hot pixels (always on pixel)
2. Dead pixels (always off pixel)
3. Stuck pixels (one or two sub-pixels are always on or always off)

The image below, taken from Wikipedia, shows a close-up of a dead green sub-pixel.

This article aims to detail possible solutions if you discover you have a defective pixel. However before you read this article if your LCD is still under warranty you should check with the manufacturer on their defective pixel policy as in certain circumstances they may provide options to replace the panel. If you are out of warranty, or your manufacturer won't help, then this article might just save you.

Step One - Pixel Fixer Video:

First you should try running the pixel fixer video (by NICK TOOHILL), as stuck pixels can often be re-enabled by rapidly turning them on and off. To use this video open your media player (Quicktime) and set the video to repeat/loop (Apple+L on the Mac). Place the video over the defective pixel and leave it to run for up to six hours. Make sure your screensaver or power saving settings do not kick in after a period of time. If after six hours of use the pixel has not re-enabled then move on to the next step.

Step Two - Pressure Method:

Get a soft cloth (screen cleaner, sunglasses cleaner or alternatively a damp washcloth) and wrap it around the round end of a pencil/pen (a biro will be fine).

Turn off your monitor and apply pressure with your chosen utensil through the cloth (so not to mark your monitor). While applying pressure, turn on your computer and screen. Hold for a few seconds and then check. This works by attempting to spread the liquid in the liquid crystal to each pixel which can sometimes be the cause of defective pixels. If this does not work move on to the next step.

Step Three - Tapping:

Display a blank image as your desktop background that shows the defective pixel (black or white are usually the best). Take your soft cloth and pencil/pen and start gently tapping the area over the defective pixel. The pressure should be just enough to cause the display to show a white glow. Tap the area between five and ten times.

If these three steps do not restore your defective pixel it might be time to officially call it dead. This is where I hope its not in the middle of your display.