Screen Test: How to Check Your Monitor
Running a screen test is a practical way to review whether your monitor is working correctly across the whole visible area. It is not only useful for dead pixels: it can also help you spot color issues, uneven brightness, strange areas, or defects that are easy to miss during normal use.
In this guide, you will learn how to check a monitor step by step, what to look for during the test, and why a simple visual review can save you trouble before returning, buying, or selling a screen.
What Is a Screen Test?
A screen test displays different solid colors and uniform backgrounds to check how the panel responds. The goal is to review the whole monitor surface and detect problems that may not be visible on a website, desktop, or regular video.
This kind of test is useful for finding dead pixels, stuck pixels, uneven brightness, and other visual defects that affect panel quality.
How to Check Your Monitor Step by Step
- Clean the screen to rule out dust, fingerprints, or dirt.
- Open a fullscreen screen test.
- Cycle through solid white, black, red, green, blue, yellow, cyan, and magenta backgrounds.
- Look at the screen from up close and then from your normal viewing distance.
- Watch for fixed dots, patches, dark zones, or unusual colors.
- Repeat the sequence once more to confirm any irregularity.
This process helps you inspect the whole monitor without needing complex equipment. If a point appears in the same place every time, or if one area reacts differently from the rest, the test will help you confirm it.
What to Check During the Test
- Dead pixels that stay black.
- Stuck pixels that remain fixed in one color.
- Light bleed or uneven brightness.
- Odd tones on uniform backgrounds.
- Marks or spots that do not disappear after cleaning.
A good screen test is not limited to one type of defect. The more backgrounds you review, the more reliable the inspection becomes.
When You Should Run This Test
- After buying a new monitor.
- Before the return period ends.
- When receiving a refurbished or used display.
- If you notice a suspicious point while working or gaming.
- Before selling a monitor to someone else.
Frequently Asked Questions
How long does a full screen test take?
Usually one to three minutes, although you can spend longer if you want a more detailed review.
Is it only useful for dead pixels?
No. It can also help detect color issues, uneven brightness, and other visual panel irregularities.
Is it better to run the test at high brightness?
Yes, a medium or high brightness level usually makes defects and unusual areas easier to see.
Run your screen test now
Open our free tool and inspect your whole monitor in seconds with solid colors and fullscreen mode.