New Monitor Checklist: Test It Before the Return Window Ends
A new monitor is worth ten minutes of checking on the day it arrives, because the two faults you are looking for are almost impossible to see once you have a desktop on the screen, and both are only worth arguing about while the return window is open.
Both checks need the same thing: full-screen solid colors, and a dark room.
Dead pixels, stuck pixels, and dust
Fill the screen with white and look for dark points. Fill it with black and look for bright ones. A point that stays black on every color is a dead pixel — the transistor behind it has failed. A point that stays one color while the screen changes is a stuck pixel, which is a different fault and occasionally clears itself.
Dust looks like both and is neither. The test is whether it moves. Change the background color and watch the point: dust sits on the glass and stays the same shade, while a pixel fault changes with the panel underneath it.
Manufacturers set a threshold before they accept a return, and it varies by brand and by panel size. Count the faults and photograph the screen with the count visible before you contact anyone.
Backlight bleed, and how much is normal
Fill the screen with black in a dark room. Light leaking in from the edges is backlight bleed, and some amount of it exists on almost every edge-lit LCD. That makes it the harder claim of the two.
What separates a defect from normal variation is shape and position. An even, faint glow along one edge is ordinary. A bright patch, a corner that is clearly brighter than the other three, or a streak reaching into the middle of the panel is not. Photograph it with the room lights off and the camera exposure locked, because a phone on auto exposure will exaggerate whatever it finds.
Photographing the evidence without overstating it
Both faults are argued over photographs, and a phone on automatic settings is a bad witness. Auto exposure brightens a dark frame until faint bleed looks severe, and HDR processing does the same thing more aggressively. A support agent who has seen a thousand of these will discount an obviously boosted image.
Turn HDR off, lock the exposure, and take the shot from your normal viewing distance rather than pressed against the glass. Include something in frame that gives scale. A photograph that looks like what you actually see is more persuasive than one that looks worse than reality, and it is the one that survives being questioned.
Do this before you mount the monitor
Both checks take longer once the screen is on an arm, cabled, and holding your desktop. Run them while the box is still in the room and the packaging is intact, because a return that needs the original box is a different conversation from one that does not.
Our monitor test cycles the solid colors full screen, so the whole check is a few clicks with nothing installed.
If the panel passes but the colors look wrong
A monitor can be free of pixel faults and still look wrong next to another screen, and that is a separate problem with a separate fix. Two panels bought at different times rarely agree on white out of the box. We wrote up the order for matching them by eye in how to make two monitors agree on color without a calibrator.
Related Desk Armory note
A dark-room photograph can exaggerate edge glow. Before treating it as a defect, use Backlight Bleed Test to compare the black screen under normal room lighting and normal content.
How this note was made
Desk Armory built the six-color full-screen test and arranged the checks around the return deadline. We did not set a universal pixel or leakage warranty threshold because policies differ by manufacturer, model, region, and seller.