New budget gaming monitor check: dead pixels, backlight bleed and IPS glow in the return window
Your new monitor has a bright dot in the corner and a pale patch along the bottom edge — is that a return, or is it normal? The honest answer depends on three things most unboxing guides never put together: what the defect actually is, where it sits, and which clock is ticking. The manufacturer's warranty clock is the slow, strict one. The retailer's return window is the short, useful one. This check is built to run inside the second clock, before it closes.
Why the return window, not the warranty, is your real protection
Here is the number that reframes the whole task. ASUS states, on its own warranty page, that it conforms to an acceptance level of between 3 and 5 defective bright or dark pixels — a panel at or below that count is considered an acceptable monitor under the warranty. Its premium range offers a stricter Zero Bright Dot warranty, but a budget panel should not be assumed to carry it.
That pattern is not unique to one brand: most manufacturers set a minimum defect count before they will replace a panel. So a single dead pixel that bothers you every day may still be, in warranty language, no defect at all.
The retailer is a different conversation. Most retailers give 14 to 30 days to return a product. Inside that window, your own judgement about whether you can live with a defect counts. Outside it, the manufacturer's threshold decides. That is why the check below belongs in the first week, not the first month you get around to it.
Before the patterns: warm-up, cleaning, settings
Three preparations, each of which prevents a false alarm. Let the monitor warm up for 15–30 minutes first, because backlight and colour drift while a panel is cold. Wipe the screen before judging anything: dust looks exactly like a dead pixel until you move it, and a speck of dust has ended more than one return argument. Then reset the monitor to defaults and set the panel's native resolution and its highest refresh rate in your operating system's display settings — a monitor left at the wrong rate or resolution can mimic faults that are really settings.
Short version: warm, clean, correctly set. Then test.
The timed check, in order
- Pixels, on five fields (about 5 minutes). Display full-screen black, white, red, green and blue in turn. Black reveals stuck and bright pixels; white reveals dead and dark pixels, plus any dust you missed; the three primary colours reveal a subpixel fault that can hide on white. Use the definitions: a dot that stays black on every colour is a dead pixel, and dead pixels almost never recover. A dot that stays one fixed colour is a stuck pixel, which can sometimes be recovered — rapid colour cycling over the spot for 10–30 minutes is the documented attempt worth making before you decide.
- Backlight, in a dim room (about 3 minutes). Show a full black screen with the room lights low, brightness at about 30%, and judge from your normal seating distance. Do not judge from a phone photo on long exposure — that exaggerates the effect well past what your eyes see in use. A small amount of light at the corners is normal for IPS panels.
- Uniformity, on grey (about 3 minutes). A mid-grey field is the toughest uniformity test: tints, patches and uneven brightness show there before they show anywhere else. Note where any patch sits — centre or edge — because position feeds the decision below.
- Motion and tone, briefly (about 4 minutes). Confirm the display is running at its rated refresh rate, and glance at a smooth gradient for harsh banding steps. Browser pattern tests like these are exact for what they show — the page puts precise pixel values on screen and your eyes do the judging — while browser timing figures are estimates, not lab measurements.
What success looks like: five colour fields with no dot you can find twice, a black field you judge acceptable from your chair at normal brightness, and a grey field with no patch you notice in ordinary content. Write down anything else, with its position. That note is the input to the decision, and the evidence if you return the panel.
Glow or bleed? The movement diagnostic
Budget IPS panels produce two pale effects on a black screen that look alike in a photograph and behave differently in a room. Separating them takes ten seconds and no tools.
Sit in your normal position and note the pale area. Now move your head — shift left, right, and closer. Then look at the same area from a different angle.
- If the pale area changes, moves or fades as your viewpoint changes, it is IPS glow: an effect of viewing the panel's light at an angle. It is a property of the panel type, not a fault in your unit, and a replacement unit of the same model will show it too.
- If the pale area stays fixed at the same edge or corner whatever your viewpoint, it is backlight bleed: light escaping at that spot. That is a property of your individual unit, and a replacement can genuinely differ.
Returning a monitor for glow, expecting the next unit to fix it, is the most expensive misunderstanding in this category — in time, in shipping, and in goodwill with the retailer. Returning one for fixed, visible bleed inside the window is exactly what the window is for.
Keep or return: the matrix
| Finding | Keep if | Return (inside the window) if |
|---|---|---|
| One dead or dark pixel | It sits near an edge and you cannot find it in ordinary content | It sits in the centre of the screen, or you see it every session — the warranty threshold (an acceptance level of 3 to 5 on the ASUS page checked for this guide) may never help you later |
| Stuck pixel | A 10–30 minute colour-cycling attempt frees it | It survives the attempt and sits where your eyes rest |
| Pale patch on black | It shifts with your viewpoint (glow), or it is corner-only and invisible at your normal brightness in normal content | It is fixed at an edge from every viewpoint and visible in dark scenes at your normal brightness |
| Grey-field patch or tint | It is faint and only findable on the test field | It shows in ordinary content — documents, video, game menus — at your usual settings |
One rule runs through every row: judge in normal use, at normal brightness, from your chair. A defect that only exists under test conditions you will never recreate is data, not a problem. A defect you see every day at your desk is a problem even when a warranty document calls it acceptable — and the return window is the one period when your definition is the one that applies.
If you return it: document it properly
Photograph the defect as it appears on screen, note the test field and brightness at which it is visible, and record the date — all inside the retailer's stated window, which most retailers set at 14 to 30 days. Check the exact window and the manufacturer's pixel policy for your model on the day, because both vary. A true colour calibration, if colour accuracy ever becomes the question, needs a hardware colorimeter; that is a different purchase and a different problem from the return-window check.
General information only. Pixel-policy figures are taken from the manufacturer's warranty page checked 2026-10-29; policies differ by brand, model and region, and your monitor's own warranty terms govern. No monitor was tested for this article — the procedure is built from the documented test sources cited in the research for this guide.
— Dex Carter, Tech Writer