Short answer: a TV that turns on by itself is almost always being woken by something – most often a connected HDMI device through HDMI-CEC (Anynet+ on Samsung, SIMPLINK on LG, BRAVIA Sync on Sony), a power-on timer, a phone or smart speaker on your network, or a stuck remote button. Samsung TVs from 2019 onwards even keep an event log that records why the TV switched on.
Why TVs turn themselves on
It can be unnerving when the TV lights up at 2am, and online forums are full of half-joking “is it a ghost?” threads. In practice, the causes are mundane:
| Cause | Typical sign |
|---|---|
| HDMI-CEC from a connected device | Happens at a regular time, e.g. when a set-top box, console or streaming stick updates overnight |
| Power-on timer | Same time every day |
| Phone, tablet or smart speaker on the same network | Coincides with someone casting, opening a remote app or a smart-home routine |
| Network wake features (Wake-on-LAN, “power on with mobile”) | Random times, often when other devices on the network are active |
| Stuck or dirty remote button | Random, sometimes the remote also behaves oddly |
| Software bug | Started after an update, or affects many owners of the same model |
| Power cut or loose connection | Coincides with flickering lights, or a One Connect box on some Samsung models |
Step 1: check the TV’s own records (Samsung)
On Samsung TVs from 2019 or later, go to Menu → Support → About TV → Event logs (update the TV first if you cannot see it). The log can show the power-on reason:
- CEC command – an HDMI device turned the TV on. Turn off Anynet+ (see below).
- YouTube or SmartThings app – a phone, tablet or other device on your network woke the TV.
- WOL (Wake-on-LAN) or BLE (Bluetooth) – a networked or Bluetooth device sent a wake signal.
- Sensor – the brightness sensor used by Ambient Mode.
Other brands do not usually offer a log, so work through the steps below one at a time and note whether the problem stops.
Step 2: turn off HDMI-CEC
HDMI-CEC lets devices control each other – handy when your soundbar or Sky box turns the TV on, less handy when a box updating at 3am does the same. It is the most commonly reported cause.
- Samsung: Settings → General → External Device Manager → Anynet+ (HDMI-CEC) → Off.
- LG (webOS 6.0 / 2021 onwards): All Settings → General → Devices → HDMI Settings → SIMPLINK (HDMI-CEC) → Off. On 2020 models it is under Connection → Device Connection Settings.
- Sony: look for BRAVIA Sync or HDMI-CEC settings in the external inputs or channels and inputs menu.
- Other brands: look for HDMI-CEC, “CEC control” or a brand name such as VIERA Link (Panasonic) or EasyLink (Philips).
LG notes you may also need to disable CEC on the connected device. A gentler option is to leave CEC on but switch off the device’s “turn TV on” feature, if it has one, so you keep one-remote control of your soundbar.
Trade-off: turning off CEC may stop your soundbar volume working from the TV remote. If that matters, try unplugging HDMI devices one at a time instead to find the one responsible.
Step 3: check timers
- LG (2021 onwards): All Settings → General → System → Time & Timer → Timers → make sure the Power On Timer is off.
- Samsung, Sony, Hisense and others: look under General, System or Time settings for “On timer”, “Power on time” or a scheduled wake.
Step 4: stop phones and smart devices waking the TV
- Check whether a household member’s phone, a smart speaker routine or a home-automation system is set to turn the TV on.
- Look for network standby or wake features (named things like “Power on with mobile”, “Wake on LAN” or “network standby”) in the network or general settings, and turn them off as a test. This may stop casting from waking the TV.
- Remove the TV from smart-home apps you no longer use.
Step 5: check the remote
Samsung’s own guidance lists dirt around the remote’s power button as a common cause. Take the batteries out overnight. If the TV stops switching on, clean or replace the remote – our TV remote troubleshooting guide explains how to test it. Our guide to common smart TV problems covers other remote and power symptoms.
Step 6: update and power-cycle
LG lists outdated firmware as a possible cause. Install any available update (how to update your TV), then power-cycle: switch off, unplug, hold the TV’s power button for 30 seconds, wait five minutes, and plug back in.
Step 7: reset or repair
If none of the above helps, a factory reset is the last DIY step (you will need to set the TV up again, including apps and logins). If the TV still turns itself on, or also switches off randomly, contact the manufacturer – especially if it is under warranty.
Is it a safety concern?
A TV switching on is not, by itself, a sign of danger. But if you notice a burning smell, buzzing, scorch marks, or the TV switches on and off repeatedly with clicking sounds, unplug it at the wall and get it checked. Never open the back of a TV – there are high voltages inside even when it is unplugged.
FAQ
Why does my TV turn on by itself in the middle of the night?
The most common cause is a connected box, console or streaming stick updating overnight and waking the TV through HDMI-CEC. Turning off CEC, or the device’s “TV on” option, usually stops it.
Can a neighbour’s remote turn on my TV?
It is possible but uncommon, as infrared remotes need a fairly direct line of sight. It is more likely to happen with TVs near windows. Rule out CEC, timers and network wake first.
Could someone have hacked my TV?
Unlikely, and the causes above are far more common. That said, keeping the TV updated and reviewing connected apps is good practice – see our smart TV security guide.
Sources and further help
- Samsung Support: How to troubleshoot a Samsung TV that keeps turning on by itself
- LG Support: Why does my TV turn on by itself?