Why is my TV screen flickering?
A flicker can be a loose cable, a setting doing its job too eagerly, or, less often, a backlight on its way out. The good news is that most are a two-minute fix, and worth ruling out before you fear the worst. Here is the order to work through, from most likely to least.
Start with the cable and the source
The most common cause is the dullest: A loose or failing HDMI cable, or a flaky box feeding the TV. Reseat the cable firmly at both ends, try a different HDMI port, and if you can, swap the cable for another. The telling clue is where it happens: If the flicker is only on one input, one console or one set-top box, then that device or its cable is the suspect, not the TV. A flicker on every input, including the TV's own apps, points further inside.
Energy saving and ambient light sensors
If the whole picture gently pulses or breathes, brightening and dimming on its own, an automatic brightness feature is fighting the room. The ambient light sensor and eco mode adjust the backlight on the fly, and on some sets that adjustment visibly pumps. Turn off Eco, Energy Saving, Ambient Light Detection and Auto Brightness. Our guide on why a TV looks dark covers where these hide, since they cause both problems.
Refresh rate and VRR flicker
A mismatch between what the source sends and what the TV expects can show up as flicker; setting your device to output a resolution and refresh rate the TV clearly supports often clears it. Separately, OLED TVs can flicker briefly in dark scenes when VRR (variable refresh rate) is switched on, as the panel shifts its refresh rate. If your flicker happens during games with VRR, mostly in dark areas, that is the cause, and turning VRR off stops it at the price of the feature.
Room lighting and fast backlight flicker
Some backlights dim by switching on and off very fast, called PWM. Most people never notice, but some are sensitive to it, especially at low backlight settings, and raising the backlight often reduces it. A quick test: Point a phone camera at the screen. If you see dark bands rolling up the image that your eye cannot see directly, that is the backlight pulsing, which is normal. Fluorescent or cheap LED room lights can also beat against the picture and look like a flicker on the screen.
When it is the backlight failing
If the flicker is erratic and getting worse, comes with dimming or a colour tint, or the screen sometimes blanks out entirely, an LCD's backlight or its power board may be on the way out. That is a hardware fault rather than a setting, and no menu option will fix it. On a set still under warranty it is well worth a claim before it fails completely.
Questions people ask
Why does my TV flicker only in dark scenes?
On an OLED with VRR turned on, the panel can flicker slightly as its refresh rate changes during dark content; turning VRR off stops it. On an LCD, dark-scene flicker is more often aggressive local dimming reacting to the picture, or, if it is getting worse, a failing backlight.
Is TV flickering dangerous, or will it get worse?
A flicker caused by a setting or a cable is harmless and stays stable once fixed. A flicker from a failing backlight or power board tends to worsen over weeks and is worth addressing under warranty before the panel gives out.
Why does my TV flicker on my phone camera but not to my eye?
That is normal and not a fault. The backlight pulses faster than the eye can follow (PWM), but a phone camera's rolling shutter catches it as moving bands. It only becomes a real problem if you can see the flicker directly, without the camera.
If the flicker turns out to be the panel rather than a setting, the Backlight Bleed Test and Dead Pixel Test help you document panel faults for a warranty claim, and the TV Capability Test shows the refresh rate your set reports.