One dead pixel on a 65-inch 4K TV is a single dot out of 8.3 million. A whole cluster is harder to miss. Either way, a busy picture hides them and a solid color fill makes them jump out. Run the free dead pixel test full screen on your TV, spot every bad dot in a couple of minutes, then work through this guide to tell dead from stuck, try a fix, and see if your warranty covers it.
Dead, stuck, or hot: what you are looking at
A dead pixel is one with a failed transistor. No signal reaches it, so it reads as a tiny black dot on any picture, including pure white. Dead pixels are permanent. Rapid color cycling, the fix that sometimes works on stuck pixels, won’t touch it.
A stuck pixel has a working transistor but it’s frozen to one subpixel value. It glows red, green, or blue while everything else changes. Against a dark background it’s unmissable. Run color cycling over it for 20 minutes and there’s a decent chance it clears.
A hot pixel runs all three subpixels at full output. The dot stays bright white regardless of what’s on screen. It’s less common than a stuck pixel and rarely responds to color cycling.
Each full pixel has three subpixels. One bad subpixel shows against one specific fill color and disappears on the others, so testing a single color misses it.
Run the test on your TV
Smart TV browser: Open the dead pixel test in your TV’s browser. Go full screen so the solid color covers the whole panel. Cycle through white, red, green, blue, and black. A dead pixel appears as a persistent dark dot on the bright fills. A stuck pixel glows its fixed color against the black fill.
USB method: Put solid-color images on a USB drive (one per color: white, red, green, blue, black). Open them in your TV’s media player. Same scan, no browser required. Works on any TV with a USB port.
Get close during the scan. A pixel on a 4K TV is physically smaller than on a 1080p TV of the same screen size, because the same area holds four times the pixels. Stand an arm’s length away. Once you spot something, step back to your couch. If it vanishes at normal viewing distance, it’s not worth pursuing.
Rule out the easy causes
Wipe the screen with a dry microfiber cloth first. Dust is the most common false alarm: it mimics a stuck pixel perfectly on a bright fill, and it wipes away.
If a spot survives the cloth, connect a different source to another input. Dot gone? The cable or source device is the culprit, not the panel. Dot still there? Panel fault.
What you can try on a stuck pixel
Color cycling: Run the dead pixel test on Auto-cycle directly over the stuck spot. Rapid color changes flip the frozen subpixel through its range and can free it. Give it 20 to 30 minutes before you give up.
OLED-specific: LG OLED TVs include a Pixel Cleaning function under Settings > General > OLED Care > OLED Panel Care. It runs a full subpixel refresh cycle, takes about an hour, and is the right first step for any OLED with a stuck pixel. Samsung OLED and QD-OLED models have a similar routine in their picture settings.
LCD/LED-backlit TVs only: If color cycling does nothing, light pressure directly on the spot sometimes helps on an LCD panel. Power the TV off, fold a soft cloth over the exact pixel location, and press gently for a few seconds as you turn it back on. Use light pressure only. Pushing hard damages the panel and voids the warranty.
Never press an OLED panel. Pressure on the organic layer leaves a permanent white smear that’s worse than the original stuck pixel.
Dead pixels don’t respond to any of these. If you have one, skip straight to the warranty section below.
Know your warranty threshold
The ISO 9241-307 standard (Class II) lets manufacturers ship panels with up to 2 dead pixels and up to 5 stuck or partial ones before it counts as defective. Premium TVs sometimes carry a zero-bright-dot policy that covers a single stuck pixel. Budget screens often allow more. Your warranty document has the exact threshold.
Test the TV the day it arrives, while the return window is still open. A dead pixel on day one is a free exchange. The same pixel three months in and the manufacturer may cite their defect threshold and decline the claim. If you’re buying a used TV, run the test before any money changes hands.