How to check my screen for dead pixels?

One of the common faults that occur in computer displays are dead pixels. These cause a portion of the screen to be useless. This defect can happen to any device that uses both LED and LCDs. There are several causes of dead pixels, and we shall discuss most of them later in the article. Surprisingly, some of the causes don’t even have anything to do with how you use the monitor itself.

In this article, we shall discuss everything you need to know about dead pixels. We shall share with you what it means for a monitor’s pixel to be dead, what causes this fault, and the most reliable step-by-step method that you can use to detect these dead pixels. If you have a monitor that you suspect to be having dead pixels, you can have it along with you while going through the step-by-step method of detecting them. Let’s dive in.

What is a dead pixel? 

A dead pixel is a phenomenon where one of the pixels in a device's display is permanently off, and it doesn't bring color. For those who may not know, a pixel is the smallest addressable element of a display or an image. If you have a wide-screen Tv with a resolution of less than 4K, you can see its pixels when you get very close to it. Pixel density is one of the features used to determine the quality of a display. When some of the pixels get turned off permanently, that portion of the display where these turned off pixels are located will appear as black. For some displays with higher pixel density (number of pixels per inch), it may at times be hard to see the dead pixels more if they are few.

For instance, if you have a display with a 4K resolution, you will likely not see the dead pixels if they just 3 or 4 of them. However, there are some methods that can be used to detect any dead pixels even if you are having a high-resolution display. We are going to look at some of these methods later in this article. So, when you see a dark spot within your computer or phone's display, it is most likely the portion with dead pixels. Before you can conclude, it is always important to first clean the screen to ensure it is not dirt. The bad news about this defect is that it cannot be fixed once it has happened. The only solution to this issue is replacing the display with a new one. So, it is always better to avoid them before they occur.

What are the causes for dead pixels?

Several factors can lead to getting dead pixels, but some of the common ones include the following;

  • Physical damage

If your display gets hit by a physical object or if you accidentally drop it, there are high chances that some of the pixels in the screen may get damaged. In some incidents, the display may not even get shuttered, but some of the pixels inside may get turned off due to the shock caused by physical impact. So, when you drop your device, it is always important to check for dead pixels even when the display itself is not shuttered.;

In some scenarios, the pixels may work for a couple of days after the physical shock, but later become faulty. This simply means the transistors that power up these pixels were not immediately affected by the impact.

  • Water damage

When water gets into your display, it will cause short circuits amongst the transistors that power up the pixels hence damaging them. Just like physical damage, the impact of water damage may at times not be immediate, so you will have to be keen for a couple of days if your device gets in contact with water.

  • Manufacturing defect

Manufacturing defects are some of the most common causes of dead pixels. This usually happens during the earlier days of new display technologies. In some cases, the manufacturing process of displays may not be perfect due to a couple of reasons. If you happen to get a display that has a manufacturing defect, you can return it to your seller if your warranty is still valid.

  • Aging

Displays usually last long, but they can get dead pixels after using them for several years. The fact that a display is an electronic device, it is possible for the transistors that are responsible for providing power to the pixels to age and eventually stop working.

How to detect any dead pixel on my screen/monitor?

When you suspect some portion of your display to be having dead pixels, you can use our dead pixel test to detect them. Beforehand, we recommend that you clean your display with a soft cloth so that you don't confuse external dirt for dead pixels. Below is the procedure for detecting dead pixels. When you get to our dead pixel test, your web browser will go full screen and you'll be able to display eight colors on the entire screen. For each color, carefully look at all sections of your display and find out if there are any dark or odd colored spots. For better results, it is best you increase the brightness of your monitor to the maximum to ensure all its pixels get the highest amount of light possible. If your monitor’s maximum brightness is not high enough, you should consider doing this test in a place that has low light.

What to do if I find any dead pixel on my screen ?

If you happen to find any dead pixels after using the above method, you can refer to our dead pixel fix page. There, we will let you know a few tricks that might save your display.

In case these tricks don't work, if you only find a couple of dead pixels on your screen, you may opt to use the display because you may not even notice them if at all your focusing on the content being displayed on your screen. However, if you detect several dead pixels, you may want to replace your display. If your device still has a valid warranty, you should contact your supplier to replace the it for as long you didn't damage it physically since most warranties don't cover physical damages.