LG TV - Troubleshooting TV Intermittently Powers On/Off

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There are several things that can affect the TV's power, here are the most comon ones

1. Power Cord Issues

   Check the power cord:

   1. Unplug the power cord, if it is detatchable from the TV, remove it from the TV as well.
   2. Inpsect the pins that connect to the wall outlet to ensure they are not bent, or damaged.
   3. Inspect the power cord itself for slashes, exposed wire, melting or physical damage.
   4. If the cord detatches from the TV, inspect the connection end of the cord as well as the pins on the back of the TV that connect to the cord.
   5. If everything looks good, reconnect it and test the TV, if the issue persist a technician may be required

2. TV Ventilation

   If the TV overheats, it may turn off, to avoid this check the following:

   1. Do not install in a confined space such as a bookcase.
   2. Do not cover the product with cloth or other materials while plugged.
   3. Do not install in excessively dusty places.
   4. Keep the product away from direct sunlight.
   5. When mounting a TV on the wall, make sure not to install the TV by hanging the power and signal cables on the back of the TV.

3. Timer Settings

   The TV's may have an option to turn off after a certain amount of time

   Press the setting button on the TV remote and select [All Settings] → [General] → [System] → [Time & Timer] → [Timers].

   • Off Time - Turns the TV off at a preset time each day. Check if Off has been set.
   • On Time - If On Time has been set or the TV has been inactive (no buttons have been pressed) for 2 hours, the TV will turn off automatically to save power. Check whether the On Time has been set.
   • Sleep Timer - Turns off the TV after a prescribed period of time. Check if Sleep Timer has been set.
   

4. Checking HDMI - CEC

   On LG TVs, HDMI-CEC is known as "Simplink" and allows you to control connected devices (like soundbars or game consoles) with your TV remote.

   Your other devices may be affecting your TV if this feature is turned on.

   To disable this feature press the button on the remote control → [All Settings] → [General] → [Devices] → [HDMI Settings] → [Simplink (HDMI-CEC)] → [OFF].

   

5. Quick Start+

   On webOS 6 and newer, a feature called "Quick Start+" is enabled by default, which puts the TV into a standby mode when it is turned off allowing the TV to turn on quickly later.

   To disable this feature press the button on the remote control → [All Settings] → [General] → [Devices] → [TV Management] → [Quick Start+] → [OFF].

   

6. Wake on LAN (WoL)

   WoL (Wake on LAN) helps you remotely turn on TVs over the internet. Connect TVs and a PC in the same network, and send Magic Packet program to the MAC addresses of registered TVs. Then, it will wake up the TVs via LAN port.

   • To enable WoL, you might need to disable "Quick Start+"
   • When configuring Wake-on-LAN, make sure you're using the correct MAC address for the TV's WiFi interface, not the Ethernet interface.
   • If you're using Home Assistant, ensure the webOS TV integration is configured correctly for Wake-on-LAN, and that the TV and Home Assistant are on the same network.

7. Mobile ON

   LG TV models with WebOS 3.5 and later, can be turned on and off using the ThinQ app. For older webOS versions only the power-off function is available.

   Note

   This requires using the ThinQ App on your mobile device, for more information please check our How to Set Up the LG ThinQ App on Your LG Smart TV article.

   To disable this feature press the button on the remote control → [All Settings] → [General] → [Devices] → [EXTERNAL DEVICES] → [TV ON WITH MOBILE] → [TURN ON via WI-FI] -OR- TURN ON via BLUETOOTH → [OFF] .