Your smart TV turns on by itself because of a setting called HDMI-CEC, which lets connected devices send power commands to your television. This is the most common cause of the issue, far more frequent than electrical faults or ghost signals, and it's the first thing you should check. Disable HDMI-CEC (often labeled Anynet+, Simplink, or HDMI Control) in your TV's settings menu, and you'll likely stop the random power-ons immediately.
Turning off HDMI-CEC to stop a smart TV turns on by itself
HDMI-CEC (Consumer Electronics Control) is a feature that allows devices connected via HDMI ports to control each other. When your Blu-ray player, game console, soundbar, or streaming stick sends a command, like waking from standby, your TV interprets it as a power-on signal. This is the number one reason for a smart TV turning on by itself, and similar signal confusion can also make my Samsung smart TV glitching with random inputs. Here's how to disable it:
Step 1: Open your TV's settings menu
Press the Menu or Settings button on your remote. Look for the gear icon on the home screen if you can't find a dedicated button.
Step 2: Locate the HDMI-CEC setting
Navigate to General, System, or External Devices. The exact name varies by brand:
- Samsung: Anynet+ (under General → External Device Manager)
- LG: Simplink (under All Settings → General)
- Sony: Bravia Sync (under Settings → External Inputs)
- Vizio: CEC (under System → CEC)
- TCL/Roku: HDMI ARC or CEC (under System → Control other devices)
Step 3: Turn it off completely
Toggle the setting to Off or Disabled. If you see sub-options like "Auto Power On" or "Device Power On," disable those too. Once disabled, your TV will no longer respond to power commands from HDMI-connected devices. This single change resolves the problem for most users. If you need to keep CEC for convenience, at minimum turn off the "Auto Power On" sub-option, but full disable is the most reliable fix.
Reset your remote control and check for signal interference
Remote issues are the second most common cause. A stuck button, low battery, or cross-signal from another remote can send the power command repeatedly. Here's a quick troubleshooting sequence:
Step 1: Pull the batteries and drain residual charge
Remove the batteries from your remote. Press and hold the Power button for 10 seconds to discharge any stored power. This resets the remote's internal circuitry.
Step 2: Reinsert batteries and resync
Put fresh batteries in and, if your remote uses Bluetooth, resync it by holding the Back and OK buttons together for 5 seconds (check your manual for exact pairing steps).
Step 3: Eliminate signal interference
Move other IR-emitting devices, like a second remote, a gaming controller, or a universal remote, away from the TV. Also, check if any device in the room uses the same IR frequency (e.g., a soundbar remote). If your TV has a physical power button, make sure nothing is pressing against it (like a stack of books or a decorative item).
Disable scheduled software and network updates
Smart TVs often have automatic update timers that wake the TV from standby to install firmware or refresh content. These updates can trigger a power-on in the middle of the night or during the day. To stop this:
Step 1: Find the update settings
Go to Settings → Support → Software Update (Samsung), or Settings → General → About This TV (LG). Look for "Auto Update" or "Update at Scheduled Time."
Step 2: Turn off auto-updates
Disable the automatic update option. If you see a "Time" setting, change it to a time when you're awake and can observe the TV, or simply turn it off entirely. Also, check your network settings:
Keeping your TV's software updated is still important for security, but you can manually trigger updates when you're ready, rather than letting the TV decide to turn on by itself.
Verify power connections and check for stuck buttons
A less glamorous but common cause is a physical issue. Loose plugs, a failing surge protector, or a stuck power button on the TV itself can cause random power-ons. Here's what to check:
Step 1: Inspect the power cable and outlet
Unplug the TV from the wall and check both ends of the power cord for damage. Plug it into a different outlet, preferably one that's not shared with a high-draw appliance (like a refrigerator or microwave) that can cause voltage dips. If you're using a surge protector, test the TV directly in the wall outlet to rule out a failing protector.
Step 2: Test the physical power button
Press the power button on the TV itself (not the remote) several times. If it feels sticky, doesn't click cleanly, or stays depressed, that's your culprit. Clean around the button with a dry cloth. If the button is physically damaged, you may need to disable it in settings (some TVs allow you to lock the physical buttons) or consult a technician.
Also, check if any object is leaning against the TV's IR sensor or power button, this happens more often than you'd think with kids or pets in the house.
When to reset your TV completely
If you've disabled HDMI-CEC, reset the remote, turned off updates, and verified power connections, but the TV still turns on by itself, a full reset is the next step. This clears any glitchy software states that might be causing phantom power commands.
Step 1: Perform a soft reset
Plug it back in and test.
Step 2: Factory reset
If the soft reset doesn't work, go to Settings → General → Reset (or System → Reset). You'll need your PIN (default is usually 0000). This wipes all settings and returns the TV to its out-of-box state. After the reset, set up the TV again and do not re-enable HDMI-CEC or auto-updates until you're sure the issue is gone. For a detailed walkthrough, see our related guide on How Do You Reset A Smart TV.
If the problem persists even after a factory reset, it could indicate a hardware fault in the main board or power supply. In that case, you may need to determine if the backlight or power supply is failing to diagnose the issue before calling a repair service.
Keep your picture looking right
Once you've stopped the random power-ons, you might notice that your picture settings were reset during troubleshooting or that you want to fine-tune the display now that you're not fighting the power issue. The good news is that you can easily optimize your screen for your room and content. Check out our guide on adjusting smart TV picture settings to get the best brightness, contrast, and color balance for your viewing environment. If your Samsung still shows a generic logo at boot, you can change the startup screen on my Samsung smart TV to complete the personalized feel. Whether you're watching movies, sports, or gaming, a properly calibrated picture makes the TV feel like new again, and now it won't turn on when you're not using it.
For the wider topic, see adjusting smart TV picture settings.
