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Local onlyClean your screen, then inspect each full-screen color.
▣5 solid colorsBlack · White · Red · Green · Blue
1 Clean the screen2 Dim reflections3 Inspect every corner
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Device check
Dead Pixel & Screen Test
Fill your display with solid colors to make dead, stuck or unusually bright pixels easier to see.
✓ Instant result✓ No sign-up✓ Runs in your browser
01
How to use this test
- Clean dust and smudges from the display.
- Start the full-screen color sequence.
- Inspect every area and tap to move through each color.
02
If something looks wrong
- A speck that moves when wiped is dust, not a dead pixel.
- View the screen straight on and dim harsh room reflections.
- A black dot on every color may be dead; a fixed bright color may be stuck.
What the result means
Solid colors make fixed pixel defects easier to isolate.
The test fills the display with uniform black, white, red, green and blue fields. A speck that remains in exactly the same physical position across colors is easier to notice without icons or text around it. Inspect at normal viewing distance first, then look closer only at suspicious areas.
A consistently dark point can indicate a dead pixel; a point fixed on one bright color can indicate a stuck subpixel. Dust, dried droplets, reflections and marks on a screen protector can look similar. Clean the surface safely and change both the displayed color and viewing angle before deciding the defect is inside the panel.
Reading the signal
Compare the same spot across every color.
Dark on every color
A point that remains black on white and on all primary colors may be a dead pixel or an opaque surface defect.
Fixed bright color
A red, green, blue or mixed-color point that does not follow the background may be a stuck subpixel.
Visible only on black
A bright point on a black field can be a hot or stuck pixel, backlight bleed, pressure mark or dust depending on its size and shape.
Cloud or edge glow
A broad area is not a single pixel. LCD viewing angle, backlight uniformity, panel pressure and dark-room exposure can make it more visible.
Browser-test limits
This is a visual aid, not an electronic panel diagnostic. Browser scaling does not prevent the solid field from revealing fixed defects, but the test cannot count physical subpixels, repair them or determine warranty eligibility.
Read our complete testing methodology →Troubleshooting
From symptom to next step.
What you seeLikely causeWhat to try
A speck changes when wipedDust, residue or damage to a removable protector is on the surface.Power the display down and clean it only with the method recommended by its manufacturer, then repeat the color sequence.
One colored point never changesA subpixel may be stuck, or image-retention behavior may be temporarily visible.Restart the display, leave it off briefly and compare a different full-screen source. Avoid pressing or rubbing the panel.
Bright patches near an edgeBacklight bleed, panel pressure or viewing angle is affecting a larger region.Return to normal room light and viewing position, reduce excessive brightness and compare with manufacturer tolerance guidance.
Quick answers
Good to know.
Can this repair a dead pixel?+
No. This test helps you find pixel defects; it does not repair the display.
What is the difference between dead and stuck pixels?+
A dead pixel stays dark, while a stuck subpixel often remains fixed on red, green, blue or another bright color.
Should I press on a stuck pixel?+
No. Pressure can permanently damage the panel or spread a defect. Use only manufacturer-approved procedures and rely on warranty support when the defect matters.
Is a dark speck always a dead pixel?+
No. Surface contamination and marks on a screen protector are common look-alikes. A true pixel defect stays fixed after careful cleaning and across different images.
Why does black look uneven around the edges?+
Many LCD displays show some backlight variation, especially in a dark room at high brightness. A broad glow is different from a single fixed pixel.