Dead Pixel Test: How to Find (and Maybe Fix) Dead Pixels
⚡ Quick Answer
To run a dead pixel test, display solid full-screen colours — white, black, red, green and blue — and scan the screen for dots that stay dark or stuck on one colour. A free browser-based screen test does this in under two minutes with no download. Dead pixels stay black on every colour; stuck pixels glow one colour permanently.
Dead Pixel or Stuck Pixel? They're Not the Same Thing
You've spotted a tiny dot on your screen that won't go away. Before you panic, it helps to know exactly what you're dealing with, because the two most common pixel faults behave very differently.
A dead pixel receives no power at all. It appears as a black dot on every background colour, and unfortunately it's usually permanent. A stuck pixel, on the other hand, is receiving power but is frozen on one sub-pixel colour — so it glows red, green or blue no matter what's on screen. Stuck pixels can sometimes recover on their own or be coaxed back to life.
There's a third impostor worth ruling out: dirt. A speck of debris or a tiny mark on the glass looks remarkably like a dead pixel. Give the screen a gentle wipe with a microfibre cloth before you diagnose anything.
👤 Real-Life Scenario
James, a graphic designer from Leeds, noticed a green dot in the corner of his new monitor. He assumed it was faulty and started the returns process. A quick full-screen colour test showed it was a single stuck sub-pixel — and after cycling colours on that area for a few minutes, it cleared completely. No return needed.
How to Run a Dead Pixel Test — Step by Step
You don't need to install anything. A browser-based screen display test cycles your screen through the solid colours that make faulty pixels stand out.
- Clean the screen first — Use a dry microfibre cloth so you don't mistake dust for dead pixels.
- Open the screen test in your browser — Switch to fullscreen mode so the entire panel is covered.
- Cycle through solid colours — View pure white, black, red, green and blue one at a time. Each colour reveals a different kind of fault.
- Scan methodically — Work across the screen in rows, the way you'd read a page. Faults near the edges are easy to miss.
- Note what you find — A dot that's black on white is likely dead. A dot glowing one colour on a black screen is stuck. Take a photo with the position visible — useful for warranty claims.
Free Tool
🖥 Check Your Screen Now
Full-screen colour cycling, sharpness grid and resolution info — right in your browser.
Open Screen Display Test →Can You Fix a Dead or Stuck Pixel?
Honest answer: dead pixels almost never come back. Stuck pixels are a different story — many do recover. Here's what's worth trying, in order of least to most risky.
1. Wait and re-test
Some stuck pixels clear on their own within a few days of normal use. Run the test again after a day or two before trying anything else.
2. Colour cycling (pixel flashing)
Rapidly changing the colours in the affected area can sometimes 'unstick' a frozen sub-pixel. Software pixel-fixers flash colours at high speed over the fault for 10–30 minutes. Success rates are mixed — but it's free and harmless to the panel.
3. Gentle pressure massage — with caution
The classic trick: turn the screen off, place a soft cloth over the stuck pixel, and apply very gentle pressure with a blunt rounded object while turning the screen back on. Be careful: pressing too hard can damage more pixels than you fix, and on some panels it voids the warranty. If the screen is still under guarantee, skip this entirely and claim instead.
4. Accept it or replace the panel
One dead pixel in a corner is something most people stop noticing within a week. A cluster in the middle of the screen is a genuine defect worth pursuing with the manufacturer.
| What You See | Diagnosis | Outlook |
|---|---|---|
| Black dot on all colours | Dead pixel | Usually permanent |
| Red, green or blue dot on black | Stuck pixel | Often fixable |
| Dot that wipes away | Dirt on the glass | You're fine |
| Cluster of dark dots | Panel defect or damage | Warranty claim |
Dead Pixels and Your Warranty Rights (UK)
Manufacturers publish 'pixel policies' that define how many faulty pixels count as a defect — and they vary widely. Many follow the ISO 9241-307 standard, where a Class II panel is allowed a small number of faulty pixels per million before a replacement is due. Premium monitors increasingly come with zero-bright-pixel guarantees.
In the UK, the Consumer Rights Act 2015 also gives you protection when goods aren't of satisfactory quality. A screen that arrives with dead pixels out of the box is a strong case for rejection or replacement within the first 30 days, whatever the manufacturer's pixel policy says — you bought it from the retailer, and your contract is with them. Document the fault with photos and your screen test results, and contact the retailer first, not the manufacturer.
Buying second-hand? Run a dead pixel test before money changes hands. Our used laptop testing checklist covers the full 10-minute inspection routine.