How this test works
Cycle through solid colors and inspect every part of the panel at a comfortable viewing distance.
- Prepare the display using the checklist below.
- Select Start test and allow fullscreen mode if your browser asks.
- Use the arrow keys, on-screen controls, or click the pattern to move through the test.
- Exit the runner and save a local observation if useful.
Before you begin
- Clean the screen gently
- Set browser zoom to 100%
- Use a comfortable brightness
What to look for
- Dark points on white or colored screens
- Bright points on a black screen
- Marks that remain in the same position
Important: This is a visual check. Dust, surface marks, scaling, and eye fatigue can look like pixel defects.
Frequently asked questions
What is a dead pixel?
A dead pixel stays dark because it no longer produces light. A stuck pixel may remain red, green, blue, or bright.
Can this test repair pixels?
No. The test helps you locate possible defects but does not repair the panel.
Which colors should I check?
Black, white, red, green, and blue reveal most common pixel faults.