Choose the colours (completed)

Check each colour in full screen (current step)

Order of colours

Click or press Space to change colour. Press Esc to leave.

After the full-screen check, record the result for each colour here.

Clean the screen with a soft cloth and raise the brightness.
Choose the colours to check in step 1, then select “Check in full screen”.
Look over every part of the screen for each colour, from the top left to the bottom right. Click or press Space for the next colour, and press Esc to leave.
After you leave full screen, record the result for each colour in step 3. If you find a fault, take a photograph with your phone and note its position.

What is the difference between bright, dead and stuck pixels?: A bright pixel stays lit on black. A dead pixel stays dark on white. A stuck pixel shows the wrong colour on red, green or blue, usually because one sub-pixel stays on or off.
Can a dead pixel be fixed?: Dead pixels and pixels that stay lit are usually panel defects and generally cannot be fixed by software. This page does not offer a fast-flashing “fix” pattern: fast flashing can trigger photosensitive epilepsy, and there is no evidence that it works.
How many dead pixels qualify for a return?: Each manufacturer sets its own rules on the number and position of pixel faults. The warranty terms of your product or the return policy of the seller apply.
Can I test a phone or a TV?: Yes. Open this page in the browser on the phone or TV. Browsers on iPhone cannot show a web page in full screen, so please hold the phone sideways and check every part of the screen.

Dead pixels show only against certain solid colours. Please check each colour as described below.

Bright pixel: A white or coloured dot that stays lit on a black background.
Dead pixel: A black dot that does not light up on a white background.
Stuck pixel: A dot with the wrong colour on a red, green or blue background. Usually one sub-pixel stays on or stays off.

Clean the screen first: Dust can look like a dead pixel. Only a dot that stays in place after you wipe the screen with a soft cloth is a pixel fault.
Brightness and colour: Please raise the screen brightness and turn off eye comfort, night mode and other features that change colours.
Full screen: Press Esc to leave full screen. Browsers on iPhone cannot show a web page in full screen, so please hold the phone sideways and check every part of the screen.
Record the position: If you find a fault, please take a photograph with your phone and note its position. Manufacturers set different rules for pixel faults. The warranty terms of your product apply to returns and repairs.