Blue screen
A pure blue field across the whole screen. Blue is where a cool corner or an uneven backlight tends to give itself away, and it is the field on which a failed blue sub-pixel becomes obvious.
The test
The full screen field needs JavaScript to run. Everything below still explains what this color reveals, so the page is useful either way.
Blue screen, full screen
Fills the entire screen with nothing else on it. Press back or escape to leave. On a television, open this page in the set's own browser and drive it with the remote.
What this field reveals
A dark dot on blue means the blue sub-pixel has failed. The dead pixel test steps through every field needed to be sure.
Uneven blue is what usually makes a corner look cold; compare with the uniformity test.
Blotches on a solid field are a panel-quality matter rather than a signal fault.
If your TV shows a blue picture on its own, with no signal, that is an input problem: see the no signal guide.
Quick answer
A blue screen test drives only the blue sub-pixels at full output. A dot that stays black on blue has a failed blue sub-pixel, and uneven zones often read as a corner that looks cooler or dimmer than the rest. This is a test pattern, not the Windows error screen of the same nickname: nothing here indicates a system crash, it is simply a solid blue picture for checking a display.
The other full screen colors
Each color exposes a different kind of fault:
Keep testing
Dead Pixel TestOr jump straight to another test:
Questions people ask
What is a blue screen test for?
It fills the display with pure blue so only the blue sub-pixels are driven. That makes a failed blue sub-pixel show as a dark dot and helps reveal uneven areas, particularly corners that lean cool. It has nothing to do with the Windows blue error screen.
My TV shows a blue screen by itself. What does that mean?
That is usually the set telling you there is no picture on the selected input, not a fault in the panel. Check that the right input is chosen and that the source device is on, or work through the no signal guide.
Why do the corners of my screen look blue?
Uneven backlighting or panel tint, both common on LCDs. It is most visible on dark and neutral scenes. Mild tint is normal; if it is strong enough to notice in ordinary viewing, judge it with the uniformity test while the set is still returnable.
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