Dead Pixel Test
for Your Phone
Full-screen test for iPhone and Android. Whether you call it a phone test, mobile pixel test, or mobile screen check — it works on any device, no download needed.
Testing a monitor, TV, or laptop? Use DeadPixelTest.pro — this tool is optimised for phone screens only.
How to Test Your Phone
for Dead Pixels
- 1
Clean your screen with a microfiber cloth — dust can look like a dead pixel.
- 2
Tap Start Full Screen Test above. Set brightness to maximum.
- 3
Tap through each colour — black, white, red, green, blue, yellow. A dead pixel stays black on all; a stuck pixel shows as an unmoving coloured dot.
Phone-Specific Testing Tips
High PPI screens (400–500+ ppi) make a single pixel about 0.05 mm — hold your phone 20–30 cm from your face.
Disable True Tone (iPhone) and Night Mode before testing for accurate colour reproduction.
Test in a dimly lit room — ambient glare hides faint defects.
Check all colours: a dead pixel is black on every background; a stuck pixel appears as a bright dot only on black.
What Does a Dead Pixel
Look Like on a Phone?
A dead pixel appears as a tiny black dot that stays black on every background colour. A stuck pixel looks like a bright coloured dot that does not change.
A dead pixel stays black on all colours. A stuck pixel shows as a bright dot only on black. Use the full test tool to check all colours at once.
Quick Answer — Is It Covered?
If the dead pixel appeared without physical damage, it is likely a manufacturing defect and is usually covered by your manufacturer warranty. Apple typically replaces the screen for any dead pixel. Samsung requires 3 or more on Super AMOLED screens — but phones reported quickly are often replaced with just one. See the full phone dead pixel warranty guide for carrier-by-carrier details.
Frequently Asked Questions
What does a dead pixel on a phone look like?+
A dead pixel is a tiny black dot that stays black regardless of what colour the screen shows. A stuck pixel is a coloured dot that does not change — often red, green, or blue on a black background.
Can a dead pixel fix itself on a phone?+
True dead pixels cannot fix themselves — the organic material or transistor has failed permanently. Stuck pixels sometimes recover on their own or after running a rapid colour-cycling tool.
Is a dead pixel covered by phone warranty?+
Yes, if caused by a manufacturing defect. Physical damage (dropping, pressure) is excluded. Apple covers any dead pixel; Samsung requires 3+ for guaranteed replacement. Report the issue as soon as you notice it.
What's the difference between a dead pixel and a stuck pixel on AMOLED?+
On AMOLED, a dead pixel is permanently dark because the organic emitter has burned out. A stuck pixel emits the wrong colour because it is stuck in one state — this is more common and sometimes fixable with a cycling tool.
Does dropping a phone cause dead pixels?+
Yes. Impact forces can damage the thin-film transistors that control individual pixels, or break the display driver IC. Dead pixels from drops are classified as physical damage and are usually not covered by standard warranty — but AppleCare+ and Samsung Care+ may cover them.
Will a dead pixel affect my phone's trade-in value?+
Yes — most carrier and manufacturer trade-in programmes treat dead pixels as screen damage, reducing your payout by 20–40%. See our trade-in guide for carrier-specific policies.