How to fix dead pixels

hardware Fix pixel errors - this is how it works

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You don't always have to live with defective pixels in your monitor: sometimes the guarantee helps, sometimes simple freeware can correct errors. In the following article, we will show you what you can do against pixel errors.

What are defective pixels anyway?

First of all, it should be clear what exactly is meant by pixel errors. Basically, it is quite obvious: somewhere on the LCD screen, a pixel lights up incorrectly or not at all. But you can and must differentiate between three types of errors: There are dead pixels (dead) and hanging pixels (piece). There are two types of dead pixels: Type 1 are pixels that always remain in the up position, i.e. glow white. Pixel after Type 2 remain in the down position, i.e. remain black. These errors are not very noticeable, as the ambient lighting dampens the effect a little. However, these pixels are literally dead, usually nothing can be repaired here. Without going into detail: The cause is usually problems with the transistors and the liquid crystal, which let through all or no light.

With Type 3 ultimately the stucco pixels are meant. These are subpixel defects: Each pixel is made up of three subpixels that glow red, green and blue. Such subpixel errors result in colored, extremely annoying dots on the monitor. However, such errors can go away on their own over time. But if you don't have the patience or a brand new monitor, you can also help yourself.

New monitor thanks to standard and guarantee

No technology without a standard! ISO 9241 is a standard for human-computer interaction that deals with pixel errors, among other things. The classification of the three types of errors can also be found here. The errors allowed to meet the standard are now of interest. Because if the manufacturer states that it fulfills this standard, too many errors are a case for the guarantee.

The standard divides into five defect classes with different values ​​for defects per 1 million pixels: Class 0 means zero errors, Grade 4 allows 50 type 1 errors (white pixel), 150 type 2 (black pixel) and up to 500 subpixel errors. The standard leaves some leeway and not every device on the market will be certified, but at least the standard is a guide. At least one thing is clear, namely that a single pixel error is usually not considered a defect and insofar as it does not necessarily grant a right of return. However, some manufacturers give guarantees that there are no dead pixels, completely outside of the norm. In any case, it is worth taking a closer look at the matter.

Find pixel errors

Finding pixel defects is very simple. Basically, you only have to alternately fill the monitor completely with black, white, red, green and blue - individual pixels that fall out of the frame are also immediately noticeable. There is a lot of online help for this, but of course the tool that we use for repairs also includes the function.

Dealing with the freeware Dead Pixel Tester is very simple:

  1. Start the tool and you will immediately see the entire screen filled with a pattern.
  2. About a Left click on the background switch colors, about one Right click show and hide the program window.
  3. You can change the type of background via the menu under "PatternsIn addition to various color patterns, there are also backgrounds with noise, where one or the other defective pixel is more likely to be found.
  4. Once the defective pixels have been identified, the repair can begin - unfortunately, dead pixels have no chance of shining again as zombie pixels.

Fix pixel errors with freeware and a pen

There are now three unspectacular options for repairs: The Dead Pixel Tester has a button for the "Exciser"which simply shows a small square flashing in all colors on the monitor. Now move this square with the mouse onto a defective pixel. You can also click the "Excerciser" button more frequently to conjure up more squares. This animation program for bored pixels should regenerate the subpixels and resume regular operation. And there are quite a few reports with success reports.

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The other methods rely on (moderate) physical strength: Nudge and apply pressure. To begin with, you should try gentle pressure. Insert one Kitchen towel or something similar about the spot with the hanging pixel and place one pen right on that pixel. Turn off the monitor, apply a little pressure, wait two or three seconds, and then turn the monitor back on. Then you can remove the pen again and the pixel could / should work again. You can also save yourself having to switch the monitor on and off the first time - that is usually enough. A tip for printing: You should be able to see a small white circle around the pressure point.

Alternatively, you can try the tip of one Erasers or some other small, rather soft object towards the pixel beat. If it doesn't work after ten, fifteen tries, then you must write off the pixel. Both methods are intended to ensure that the liquid crystal is properly distributed again and that the pixel can be controlled correctly again.

And another method can be found, albeit much less often, as a tip: heat. Soak to do this Cloth in around 85 degrees hot water, seal it tightly in a freezer bag and gently press the hot bag onto the area with the affected pixel for a few seconds. Here, too, the construction of the "pixel" should loosen up again in order to start normal operation.

The whole thing may sound a bit like a mixture of technoid heart massage and IT esotericism, but there are many success stories, it costs nothing and is done quickly! Of course, despite everything, you should be frustrated with pixels to act with caution: Too much pressure, too much heat or too violent "nudging" have the potential to destroy more than just a single subpixel. In particular, wild knocking leads to more than fewer mistakes. An LCD display is just not a tube monitor that sometimes needs powerful blows. Above all, all of this can of course be used Loss of guarantee to lead. The physical methods should only be used very moderately and / or only with monitors that you could get over losing in an emergency. But when Last rescue It is definitely worth a try in front of the recycling center.