To check for bad Mac screens, use the monitor to test the website, macOS-owned features, or third-party applications. ① Visit deadpixeltest.org and other websites to display solid color images such as red, green, and blue in full screen, and observe whether there are fixed black spots or color spots in dark light environments; ② Create solid color full-screen images through the "Preview" App and enlarge to view details, or zoom to check suspicious areas after screenshots; ③ Install Pixel Tester, LCD Inspector and other tools for more systematic detection, supporting custom pattern and brightness simulation; ④ Pay attention to distinguishing bad points from dust or stuck pixels, the latter may be restored through repair tools. After confirming that it is a bad point, you should contact Apple's official after-sales service in time.

It is not difficult to check the bad points on the Mac screen (Dead Pixel), but many people may not be clear about how to do it. If you find a small dot on the screen that keeps showing black, red, green or blue, and it doesn't change whatever you look at, it's likely that it's a bad dot. Here are some practical methods to help you quickly determine whether there are any broken points on the screen.

Test the website using a monitor

There are many free monitor testing tools online that can help you quickly detect whether there are any bad points on the screen. Open a browser and search for websites like "pixel check" or "dead pixel test", such as deadpixeltest.org or screenbity.com .

These websites usually provide full-screen solid color images (red, green, blue, white, black), and you can check each color for abnormal points. It is recommended to do it in dark light, so that the problem is easier to see.

• Show each color in full screen
• Slowly scan the entire screen about 30cm away from the screen
• Pay attention to fixed small dots, especially black or color dots

Use macOS to assist in troubleshooting

Although macOS does not have a special bad point detection tool, you can assist in the inspection through some system screenshots and enlargement operations.

1. Open the "Preview" app and create a new blank image.
2. Set the canvas to full screen size and fill it with solid colors (red, green, blue, white, black, etc.).
3. Zoom in and see details, especially where bad points are prone to appear in corner areas.

You can also use the shortcut key Command Shift 4 to take a screenshot and view it, which is suitable for finding small dots that have been noticed but are uncertain.

More professional testing with the help of third-party applications

If you want to check more systematically, you can install some apps specifically used to detect screen status, such as:

• Pixel Tester : The interface is simple, supports multiple color modes and automatic switching.
• LCD Inspector : In addition to basic testing, it can also help you record bad points and facilitate after-sales communication.

This type of software usually supports custom test patterns and can even simulate the display effect at different brightnesses, making it more suitable for those who want to check carefully.

Pay attention to distinguish between bad points and dust

Sometimes you think it's a bad point, but it's just dust or debris inside the screen. In this case, the point does not change the color as the picture changes, but it may be floating on the liquid crystal layer rather than the pixel itself is damaged.

In addition, some "stuck pixels" are just a sub-pixel that keeps on light and are not completely dead. This situation can sometimes be attempted to recover with a pixel repair tool or tap the screen.

Basically these are the methods. The detection process is not complicated, but requires patience to observe. If you really find a bad point, remember to contact Apple's official support as soon as possible to see if it is covered by the warranty.

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