Dead or stuck pixels
Inspect five solid colors from your normal viewing distance.
Avada screen lab · private browser diagnostic
Online display tester
Check a laptop or monitor for defective pixels, uneven backlight, color banding, blurry text, weak viewing angles and motion trails before you buy.
Nothing is saved13 guided screens
Display test controls
Choose the screens to inspect
Run all 13 screens for a complete check, or select only the tests you need.
Used-laptop inspection
Find screen faults before you pay.
A screen can look acceptable on a product page and still have pixel, backlight, sharpness or motion problems. Run every check under the same room lighting.
Backlight and tint
Use gray fields to find bright corners, shadows and colored patches.
Text clarity
Look for halos and color fringes around small letters and numbers.
Motion quality
Compare trails at the same speed before choosing between devices.
Display tester guide
Read the screen like a technician
Work through the screens in order and inspect the entire panel, including corners and edges. Mouse wheel and arrow keys move between checks; the final screen exits the run.
How to test a used laptop display
Clean the panel, set browser zoom to 100%, reduce glare and let the display warm up. Start with the full test, scan from corner to corner, and repeat any unusual result at a second brightness level before deciding the panel is faulty.
Pixels and uniformity
Solid black, white, red, green and blue fields expose bright or dark points. Gray fields help reveal cloudy backlight, tinted patches and uneven corners.
Gradients and color distance
A healthy panel should separate nearby shades and show smooth ramps without abrupt stripes. Compare two devices with the same brightness and viewing position.
Sharpness and gamma
Small text should remain crisp without colored fringes or halos. Use the gamma mark at 100% browser zoom and adjust it until the solid letters blend into the stripes.
Viewing angle and motion
Move your head around the screen and watch for color shifts. Follow the moving blocks to spot obvious trails, then compare laptops using identical speed settings.
Questions
Display test FAQ
These browser checks help you notice visible problems. They are not a replacement for professional calibration equipment or a manufacturer warranty inspection.
Can this test find dead or stuck pixels?
The solid black, white, red, green and blue screens make unusual pixels easier to spot. A bright point on black may be stuck, while a dark point on a color field may indicate a missing pixel or subpixel.
Should I run the display test in full screen?
Yes. Full-screen mode removes most browser distractions and lets the color fields cover the panel. Keep browser zoom at 100% and press Esc whenever you want to leave.
Does the response-time check give an exact millisecond result?
The moving-block test is useful for visual comparison between laptops or monitors using identical settings. It can reveal obvious trails and ghosting, but it does not replace a laboratory response-time measurement.
How should I prepare a used laptop for screen testing?
Clean the panel, let it warm up, set browser zoom to 100%, lower strong room lighting and inspect from your normal viewing distance. Test before completing a used-laptop purchase whenever possible.