The simplest way to fix a black corner on a laptop screen

A black corner on your laptop screen is a sign that your computer is experiencing hardware or software errors. To avoid making the situation worse, you should quickly find a way to fix this error as soon as possible. 

Why is one corner of the laptop screen black?

The light emitted from laptop screens is blue light. This type of light inhibits the production of melatonin, which is the main cause of your insomnia. In particular, when your body is exposed to too much radiation emitted from the screen, the brain loses its ability to defend itself. This leads to neurological and brain-related diseases such as severe memory loss and increased risk of multiple sclerosis. Therefore, you need to find out the cause to avoid affecting your health.

There are many reasons why the screen turns black. You can refer to some of the reasons that lead to the above situation:

The simplest way to fix a black corner on a laptop screen Picture 1

Laptop screen is dark due to power saving mode

The laptop will reduce brightness when the battery level is below the specified level, activating the battery saving mode. Sometimes the laptop can hang in this mode, causing the laptop screen to darken in one corner, dim even when the battery is full.

Inappropriate brightness causes laptop screen to be dark

Your laptop's brightness changes every time you turn it on, sometimes the laptop screen is too dark or too bright. Just adjust the brightness on your laptop to your desired level.

Laptop screen has high voltage light short circuit

The best brightness level for a laptop is 1000cd/m2. If the high-pressure lamp reduces the brightness below 1000cd/m2 and breaks, it may be the cause of the black corner screen error.

The screen refresh rate is incorrect.

The oscillation frequency of a computer screen is usually in the range of 60Hz, 75Hz, 120Hz, 144Hz, 160Hz,. depending on the type, it will bring the best performance. If your screen frequency falls below the above level, the laptop screen will be dark in one corner or blurred.

Laptop screen is dark due to long-term use

Laptop screens and hardware both have a certain lifespan. After a long period of use, it is inevitable that errors such as a dark corner of the screen will occur.

If your job requires you to work continuously on a laptop for a long period of time, it is best to limit the brightness on the system settings and regularly turn off hidden software, clean up catch files and the computer's trash.

How to check if laptop screen has black corner?

One rule before buying a new laptop is to check carefully to see if the laptop screen has a black corner or dead pixels?

To check, you can use 'Dead Pixel Locator"

The simplest way to fix a black corner on a laptop screen Picture 2

This free software allows users to easily check whether their laptop screen has dead pixels or not. After downloading and installing successfully, the interface will display color boxes on the interface and what you need to do now is click on the two left/right arrows to switch between different colors on the screen. 

If your laptop screen has dead pixels, those pixels will have a completely different color than the background color you have chosen. 

After testing is complete, you can press the Esc button or press Alt + F4 to exit the interface. 

If you find dead pixels in your laptop right from the start, you shouldn't buy it, because sooner or later you'll have to replace the screen.

How to fix computer screen black corner error

As shared above, when using the device, the screen is black in one corner or the entire screen is dark, causing discomfort, affecting your eye health, your spirit and your work productivity. Therefore, you need to find a way to fix the error of the computer screen being black in one corner. Below are the simplest and most manual steps to fix this situation that you can easily do at home.

Step 1: First, turn off your computer.

Step 2: Then prepare a soft clean cloth.

The simplest way to fix a black corner on a laptop screen Picture 3

Step 3: Next, restart the computer and use the prepared cloth to gently press on the black screen area without spreading it to other areas. When pressing lightly, turn on the computer and turn on the screen to see if the black spot disappears. If the black spot remains, it means the hardware is faulty.

How to prevent laptop screen from turning black in one corner, laptop screen from going dark

Users need to pay attention when using computers or laptops to avoid unwanted situations where the screen becomes dark or black in one corner. 

1. Use genuine and quality backpacks and laptop bags to reduce impact force if it occurs.
2. Keep your laptop in a secure place, avoiding the risk of falling or impact.  
3. Be gentle and careful when opening and closing your laptop and using the screen.

Above are the causes and solutions for the error of a computer screen being black in one corner. This error may be rare but the cost of replacing the screen is very expensive, so be careful when using the computer. If you have any questions, please contact hotline 19001903 for the best advice and support.

Micah Soto

Update 16 January 2025