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[When buying a laptop screen or a desktop PC monitor, or buying a used laptop, one dead pixel on the screen is not a problem yet. But if there are many dead pixels that you fail to detect, after a while your screen will fail, and then you will have to replace it, which is quite expensive
Dead Pixel Buddy is a lightweight program of only 288KB that lets you test the screen for dead or bright pixels and check whether the colors are accurate. The tool works by turning every pixel on the screen into a single color, such as Black, White, Red, Green,… so you can look over all the pixels on the screen to see whether there are any dead ones. From there, you can decide how to deal with them.
Download Dead Pixel Buddy
How to Check a Laptop or PC Screen for Dead Pixels
Download the Dead Pixel Buddy tool from the link I left above and open it
Below is the interface of the Dead Pixel Buddy tool; it is extremely simple to use. (This tool supports most operating systems: Windows XP, Windows 7, Windows 8.1, Windows 10,…)
This tool supports 6 colors corresponding to the number keys on the keyboard. Just press the corresponding number and that color is displayed
1. Black
2. White
3. Red
4. Green
5. Blue
6. Custom: Here you can choose any color you like; the default is yellow

After you press the corresponding number, every pixel on the screen changes to that color. You can then examine each point on the screen in detail to see whether there are dead pixels or screen lines
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