Black Screen Dead Pixel Test
A pure black screen reveals stuck pixels and hot pixels — bright colored dots that are invisible on white. Dead pixels are always black and cannot be seen on a black background.
Black screen test
Look for any colored or white dots against the dark background. Go full screen for the most accurate result.
Look for bright or colored dots — stuck pixels glow on a black background.
Press F11 for best results on desktop
What to look for on a black screen
Red, green, or blue dot
One or two sub-pixels stuck in the on state — this is a stuck pixel. Try the fix tool: stuck pixels sometimes respond to rapid color cycling.
Bright white dot
All three sub-pixels (R, G, B) stuck fully on — this is a hot pixel. Visible as a white pinpoint on black. Also sometimes fixable with cycling.
Nothing visible
Dead pixels are always black — invisible on a black screen. If you suspect a defect, switch to the white test to find dead (dark) pixels.
Found a bright dot? Try the fix tool first
Stuck pixels visible on a black background are sometimes fixable. Run the free stuck pixel fix tool for 10–20 minutes and re-run this test. If the dot disappears, the fix worked. If it stays, check your warranty options.
Test on other colors too
Each color reveals a different defect type. A complete test uses all seven colors.
Best for dead pixels (black dots)
Reveals stuck blue & green pixels
Reveals stuck red & blue pixels
Reveals stuck red & green pixels
Frequently asked questions
What does a black screen dead pixel test show?+
A black screen reveals stuck pixels and hot pixels — pixels that emit light against the dark background. Dead pixels (always black) are invisible on a black screen. Use the white test to find dead pixels.
Why is black screen testing important for OLED?+
OLED produces true black by turning pixels completely off. A stuck pixel appears as a bright pinpoint against a perfectly dark background — far more obvious than on a backlit LCD. Black is the most revealing single test for OLED and AMOLED.
What is a hot pixel?+
A hot pixel has all three sub-pixels (R, G, B) stuck fully on — it appears as a bright white dot. A stuck pixel has one or two sub-pixels on, showing as red, green, blue, or a mix. Both appear on a black background.
Can I fix a stuck pixel found on the black screen test?+
Sometimes. Run the fix tool for 10–20 minutes — rapid color cycling can stimulate stuck sub-pixel transistors back into operation. Dead pixels (always black, never visible on black) cannot be fixed with software.