Yellow Screen

How to use a yellow screen

A display mixes every color from red, green, and blue subpixels. Pure yellow, #FFFF00, turns the red and green subpixels fully on and leaves blue off. Two channels are lit at once, so the screen is bright, and a pixel that is missing one of them changes color in a way that is easy to see.

1. 1

   Open it full screen. Browser toolbars around the field hide the edges and corners, where faults often sit.

2. 2

   Turn off color filters. Night mode and blue-light filters shift colors toward yellow and orange, which makes tint checks unreliable.

3. 3

   Clean the display first. A speck of dust can look like a dark pixel. If it wipes away, it was not a fault.

4. 4

   Scan slowly. Work across the screen one section at a time from your usual distance.

What a yellow screen can reveal

A green dot is a pixel whose red subpixel does not light, and a red dot is one whose green subpixel does not light. A fully dark dot means neither lights.

A pale or white dot can be a pixel with its blue subpixel stuck on.

Uneven tint, such as areas that lean toward green or orange, can point to uneven backlighting or panel variation. A small amount is normal on many displays, so check the manufacturer's warranty terms before deciding a panel is faulty.

Yellow and the blue channel

Yellow is white without blue. If the White Screen looks almost as yellow as this page across the whole display, and no color filter is on, the blue channel may not be working. Check it directly with the Blue Screen. For the other two-color mixes, use the Cyan Screen and the Magenta Screen, and confirm any dot that stays put with the Dead Pixel Test.

This screen's exact value has its own #FFFF00 color page, with its RGB and HSL values and its contrast against black and white.