🖥️ Learn how to check your screen for dead pixels, flickering and how to deal with them
Laptop and monitor diagnostic and solution guide
Have you noticed a small spot on your screen that never changes color? Or is the image flickering and tiring your eyes? In this guide you will learn how to identify these problems, what they really mean and what you can do to fix them easily and safely!
📺 What are Dead Pixels?
Your screen is made up of millions of tiny dots of light that create the image you see. Each dot is called a “pixel.” A dead pixels (dead pixel) is a point that has stopped responding and no longer changes color.
There are three main types of problem pixels:
• Dead Pixel: It stays completely black.
• Stuck Pixel: It stays "stuck" to a single color (red, green or blue)
• Hot Pixel: It always appears white and brighter than the others
⚡ What is Flickering?
The flickering (flicker) is when the screen seems to flash or "shake." Sometimes you can see it clearly, other times it's more subtle but annoying. It's like a light bulb that doesn't make good contact and flickers constantly.
Flickering isn't just annoying; it can cause eye strain, headaches, blurred vision, and in some cases even dizziness. If you notice it frequently, it's a good idea to address it immediately!
🔍 How to Check for Dead Pixels
Method 1: Use Online Tools
What is he doing: It shows full colors across the entire screen so you can identify areas that are not working properly.
How do you use it: You enter the site, click "Start" and carefully observe the screen for signs that do not change color.
What is he doing: It displays simple colored backgrounds (red, green, blue, white, black).
How do you use it: You click on each color and check if there is a point that doesn't change.
What is he doing: It offers more tests with different patterns and shades for more detailed control.
How do you use it: You follow the instructions and go through all the colors.
Method 2: Use a Simple Video
It is best to do the inspection in a dark room with the brightness turned up to maximum. This makes it easier to identify any defective areas.
🔧 How to Check for Flickering
Step 1: Observe Your Screen
Open a clean white page, such as a blank document. If the screen is flickering, you'll notice it more easily on a light background.
Step 2: Use the Mobile Camera
Cameras "scan" the image differently than our eyes, so they can detect flicker that we don't see. It's a very useful diagnostic method!
Step 3: Check the Refresh Frequency
On Windows, go to Settings → System → Display → Advanced display settings and check the refresh rate. If it's low (e.g. 30Hz or 48Hz), it may cause flickering. Opt for values like 60Hz, 75Hz or higher, depending on your screen.
🛠️ Solutions for Dead Pixels
What are you doing:
1. Turn off the screen
2. Take a soft cloth (not your fingers!)
3. GENTLELY press the problematic pixel for 5–10 seconds
4. While pressing, turn the screen back on
5. Leave the cloth
Why it might work: Sometimes the pixel isn't "dead" but just stuck. Gentle pressure helps it work again.
JScreenFix or UndeadPixel:
These tools change colors very quickly at the problem spot, aiming to unblock the pixel. Leave them on for 2–4 hours for best results.
If the screen is new and under warranty, many companies will replace it. Typically, 3–5 dead pixels will consider the screen defective. Each company has a different policy, so check their official support page.
Never press hard on the screen! Excessive force can cause permanent damage, such as white spots or larger dead pixels. If the methods don't work, the pixel is likely permanently damaged.
🔨 Solutions for Flickering
For Windows:
1. Right-click on the desktop → Display settings
2. Go to Advanced settings
3. Change the refresh rate (e.g. 60Hz, 75Hz, 120Hz)
4. Keep the one that makes the screen more stable
If you have a monitor that supports higher rates (144Hz, 165Hz, etc.), opt for them – they usually significantly reduce flickering.
Often flickering is due to a problematic or old cable:
• Make sure the cable is securely fastened on both sides.
• If you can, try another HDMI or DisplayPort cable
• Avoid low-quality adapters – they cause many signal problems
For Windows:
1. Go to Device Manager
2. Find the "Graphics Cards" category
3. Right click → Update driver
4. Restart
Note: If you have an application from the card company (e.g. NVIDIA or AMD), update from there as well for best results.
Power saving features can reduce image stability:
• Change the power plan to "High performance"
• Turn off automatic brightness adjustment
• For laptops: In battery settings, disable any feature that reduces screen performance
Many laptops use a way of controlling brightness that causes flickering at low values. If you notice flickering:
• Turn the brightness up to maximum
• If it improves, use free apps to adjust the brightness without affecting the screen:
For Windows:
👉twinkle tray – Adds a handy brightness slider to the system tray, suitable for Windows 10 & 11 (download from Microsoft Store or GitHub).
👉monitorian – Allows you to adjust the brightness on multiple displays at once and supports shortcuts.
DimScreen – Small, portable and no installation required. Makes the screen "darker" through software without affecting the hardware.
For Mac:
👉BetterDisplay – Allows brightness control via software, avoiding the flickering that occurs on laptops.
If flickering only occurs in certain apps or games, try turning off features like V-Sync or G-Sync/FreeSync in your graphics card settings. Sometimes these are responsible for the instability.
🎯 When is Screen Replacement Necessary?
Sometimes, unfortunately, the problem is not solved. Consider replacement if:
• You have many dead pixels (more than 5–10)
• Flickering does not stop with any solution
• Vertical or horizontal lines appear
• The screen has cracks or other physical damage
• Colors appear distorted or completely wrong
If the screen is under warranty, don't hesitate to contact the manufacturer. Many companies even offer a "zero dead pixel policy" for the first few months, replacing the screen completely free of charge!
🎊 Conclusion
Dead pixels and flickering are annoying problems, but they can often be solved with simple methods! The important thing is to check the screen regularly and react quickly when a symptom appears. Remember: the screen is your window to the digital world — make sure it stays in top condition!
(I.e. Last updated: December 2025
