New Monitor Unboxing Checklist: Dead Pixels, Backlight and Ports

Do the checks on a new monitor in the first days, inside the return window, in this order: keep the box and photograph the unit, connect it with the cable from the box, reset the menu, run a solid-color pass for dead and stuck pixels, check a dark screen for backlight problems, test the stand, and try every port. Most defects show up within that first hour or two.

This is the routine, not the theory. For a deeper look at what counts as acceptable pixel and uniformity behavior, see our guide on testing panel uniformity, dead pixels and backlight bleed. This page puts the checks in a sequence you can follow with the box still open.

Before you open it fully

• Keep everything. The box, foam, bags and paperwork stay until you are sure about the monitor. Returns often depend on original packaging.
• Look at the box. Crushed corners or torn tape can mean the monitor was dropped. Photograph the outside before you cut it open.
• Note the dates. Write down the purchase date, delivery date and the last day to return. Our guide to monitor return windows explains why the clock may start earlier than you think.
• Check the contents. Compare what is in the box with the listing: stand, base, screws, power cable or brick, video cable, USB cable, manual.

Set it up the plain way

Use the cable that came in the box, on the port the manual recommends, connected straight to your computer. That gives you a clean test. If you start with a long extension or a dock, a fault can look like a monitor problem when it belongs to the cable.

Handle the panel carefully. Do not press on the screen, and lift the monitor by the frame. Wipe off fingerprints with a dry soft cloth, or follow the cleaning instructions in the manual. Our guide to screen cleaning kits and safe solutions explains what to avoid. Once it is on, let it settle for a few minutes, then reset the on-screen menu to factory defaults so you start from the maker's baseline.

The pixel pass

Dead pixels stay dark, and stuck pixels stay lit in one color. Find them with full-screen solid colors. Use a plain test page or an image that fills the whole screen, in full-screen mode so nothing from the browser interferes.

1. Show black, and look for bright points.
2. Show white, and look for dark points.
3. Show red, green and blue in turn, and look for any pixel that does not match.
4. Check from normal sitting distance first, then from closer.
5. Photograph any defect, and mark where it is on the screen so you can tell if it changes.

Do not judge by one pass. Some defects are easier to see on one color than another, and a point you miss on black may be obvious on blue. Every maker has a pixel policy that sets how many defects it accepts on a given model. Find the policy on the maker's support page for your model, and note the retailer's return window, which is usually the easier route. A defect inside the retailer's window can often be settled without meeting the maker's threshold.

The dark-room backlight pass

Turn the room lights low, set the screen to a normal working brightness and show a full black screen. Look for bright patches along the edges or in the corners. Then show a mid-gray screen and look for tinted or darker patches.

Judge it from your normal seat, not an inch from the glass. Some glow is normal on many panel types and shifts as you move your head. Bleed that stays in the same place from any angle, or a patch you can see during ordinary use, is worth acting on. Take photos with a phone using settings that match what your eye sees, and avoid a long exposure that exaggerates the problem. Our uniformity testing guide explains how to tell glow from bleed.

Stand, build, ports and settings

Stand, hinge and build

• Raise, lower, tilt and swivel the monitor. Movement should be smooth and hold its position.
• Tap the desk gently and watch for wobble. Some wobble is normal on light stands, but a stand that cannot hold a position is a fault.
• Check that the panel sits flat against the bezel and that no gaps or creaks show up when you lift it.
• If you plan to use an arm, look at the VESA holes on the back and confirm they are intact. Do not mount the monitor yet.
• Listen for buzzing or whining in a quiet room at normal brightness.

Ports and extras

Do not assume every port works. Test the ones you will use and any you might need later, using devices that you know work.

If you use USB-C, remember that the cable and the laptop port both need to support video. Our guide to USB-C monitor cables explains the difference.

Settings sanity check

Finally, confirm that the computer is using the monitor's native resolution and the refresh rate you expect. If it lists only a low refresh rate, or the picture looks soft, the cause is often a setting, a cable or the port chosen, not a faulty panel. Write down what you changed so you can tell the seller what you tried if you do need to return it. If it is an OLED, show a dark gray screen for a minute and look for any faint outlines left behind from a menu or logo. Report anything like that to the seller immediately.

A schedule inside the window, then a decision

Keep, exchange or return?

A single faint defect you only notice when you look for it may be a monitor you keep. A defect in the middle of the screen, a fixed bright patch or a port that fails is a reason to act. If you are unsure, compare with a second unit if the retailer offers an exchange, remembering that a replacement may have different quirks. Document what you found, contact the seller inside the window and ask what they need from you.

Frequently Asked Questions