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You unbox a new monitor, switch it on, and there it is: a tiny bright red dot in the middle of the screen that never changes. Or perhaps you notice a black speck on your laptop display while watching a film. Once you have seen it, you cannot stop seeing it. Pixel defects are small, but they matter, especially on a device you have just paid for.

Every modern screen is made of millions of pixels, and each pixel is made of three smaller subpixels in red, green and blue. They mix to create every colour you see. A 4K monitor has more than eight million pixels, which means around twenty five million subpixels, each controlled individually. With numbers like that, occasional manufacturing faults are unavoidable, which is why manufacturers publish pixel policies that describe how many defects they accept before replacing a panel.

There is one more thing that looks like a pixel defect but is not: dust or debris. A speck on the surface of the screen, or even trapped between layers of a screen protector, can look like a dead pixel. Always clean the screen gently with a microfibre cloth before you draw any conclusions.

The easiest way to spot pixel defects is to fill the screen with a single solid colour and look closely. Our display test does exactly that. Open it, switch to full screen and cycle through black, white, red, green and blue. Each colour reveals different defects. A stuck red subpixel is invisible on red but stands out on blue or black. A dead pixel is obvious on white.

1. Clean the screen with a dry microfibre cloth.
2. Open the display test and enter full screen mode.
3. Look at each colour from a normal viewing distance, then closer.
4. Scan in sections, top left to bottom right, so you do not miss anything.
5. Note the colour and rough location of any defect.

Do this in a dim room with the brightness turned up. It takes about five minutes. If you have just bought the screen, do this on the first day, because return windows are often short and pixel policies are strict about timing.

Sometimes, yes. The idea behind most fixes is to rapidly change the stuck pixel's state, so the liquid crystals get unstuck. Pixel flashing tools cycle colours very quickly over the affected area. You drag a small flashing window over the stuck pixel and leave it running for ten to thirty minutes. Success rates vary, but it is harmless to try and it has worked on plenty of screens. Anyone sensitive to flashing lights should avoid watching the screen while the tool runs.

Another method is gentle pressure. Turn the screen off, wrap a soft cloth around the tip of a stylus or a pen cap, and press lightly on the stuck pixel. While holding pressure, switch the screen back on, then release. The idea is to physically nudge the crystals back into place. Be careful. Pressing too hard can damage the panel and create more dead pixels, so only try this gently and on screens that are out of warranty or where you accept the risk.

Most manufacturers follow an industry approach where a certain number of defective pixels is considered acceptable. Policies vary a lot. Some premium brands promise zero bright pixels, others accept several before offering a replacement. The location often matters too, with stricter limits in the centre of the screen than near the edges.

Before you contact support, find the pixel policy for your specific model on the manufacturer's website. Note how many defects you have, what colour they are, and where they sit. Take a clear photo with the screen showing a solid colour, and include something like a ruler or a finger for scale. Retailers are often more generous than manufacturers during the first couple of weeks, so check the store's return policy as well.

While you are testing with solid colours, you may notice other issues. These are separate from pixel defects but worth knowing about.

• Backlight bleed: bright patches around the edges on a black screen, common on LCD panels, especially IPS.
• IPS glow: a hazy glow visible at an angle in dark scenes, a characteristic of the technology rather than a fault.
• Uneven uniformity: large areas that look slightly tinted or darker on grey backgrounds.
• Burn-in: faint ghost images of static interface elements, mostly on OLED screens after long use.
• Lines: vertical or horizontal lines usually point to a cable, connector or panel driver fault, not pixel defects.

Lines and flickering are worth testing with a different cable and a different device before assuming the panel is faulty. A bad HDMI or DisplayPort cable can produce effects that look alarming but cost only a few dollars to fix.

The same approach works on any screen. On phones and tablets, open the display test in the browser, go full screen and cycle colours. OLED phone screens are generally free of backlight bleed, but they can show slight tint shifts at low brightness, which is normal.

For TVs, you can use the TV's own browser, or connect a laptop and send the display test to the TV. Many TVs have a service or picture test mode as well. With TVs, sit at your usual viewing distance, since a single stuck pixel on a large 4K screen may be invisible from the sofa.

Most pixel defects happen at the factory, but some develop over time. Avoid pressing on screens, especially laptop displays, where closing the lid on a pen or earbuds is a surprisingly common cause of damage. Transport monitors in their original packaging or with proper padding. Keep screens away from extreme heat and moisture.

For OLED devices, reduce the risk of burn-in by using dark mode, letting the screen dim when idle, hiding static taskbars if possible, and avoiding maximum brightness for long periods with static images. These habits also help battery life on laptops and phones.

1. Clean the screen and dim the room.
2. Run the full screen display test with every colour.
3. Photograph any defects with a solid colour background.
4. Try a pixel flashing tool on stuck pixels for twenty minutes.
5. Check the pixel policy and the retailer return window.
6. Contact support with photos and details if defects remain.

Doing this on day one with every new screen is a good habit. It turns a vague annoyance into clear evidence and gives you the best chance of a replacement if the panel does not meet the manufacturer's standard.

When shopping for a monitor, laptop or TV, check the manufacturer's pixel policy before you buy, not after. Some brands and some premium product lines offer a zero bright pixel guarantee, which gives you much stronger grounds for a replacement if a stuck pixel appears. Buying from a retailer with a generous return policy also helps, because you can test the screen at home during the return window.

Test as soon as the screen arrives, using the full screen colour method described above, and keep the packaging until you are satisfied. If you buy second hand, ask the seller to show a solid white and solid black screen, or bring a phone with our display test open in the browser so you can check the panel on the spot.