Dead Pixel Test
Clean the screen, start the test and look closely at each solid colour. A dot that never changes is a dead or stuck pixel.
Runs in your browser — nothing is uploadedTap or press → for the next colour, the left edge or ← for the previous one. Tap ✕ (or press Esc, or Back on your phone) to finish.
Tap for next colour · Esc to exit
How to use Dead Pixel Test
- Wipe the screen so dust isn’t mistaken for a pixel.
- Start the test — it fills the screen. Tap or press → for the next colour (the left edge goes back); tap ✕ or press Esc to finish.
- Look for dots that stay black on white, or stay lit on black.
Formula & assumptions
- Colours change only when you tap or press a key — there is no flashing.
Questions
Dead, stuck or hot pixel — what’s the difference?
A dead pixel stays black on every colour. A stuck pixel shows one colour (often red, green or blue) all the time. A hot pixel stays white or bright on a black screen.
Can a stuck pixel be fixed?
Sometimes it recovers on its own or with gentle pressure through a soft cloth while the screen is off. Dead pixels usually can’t be fixed — check the warranty’s pixel policy.
How do I check backlight bleed?
Use the black screen in a dark room: light leaking along the edges is backlight bleed, which is common on LCDs to some degree.