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LG TV Powers On and Off Intermittently

  • Troubleshooting - Power
  • Intermittent Power or Powers Off/On
  • Troubleshooting
  • TVs



LG TV Powers On and Off Intermittently



A TV that intermittently powers on or off is usually caused by the timer setting.

1. With a TV that has a removable power cord,

    check whether power cord is securely plugged into the back of the TV.

2. Check if the TV power cord is securely plugged into the wall outlet or the power bar.

3. Time menu options affect TVs turning on or off automatically.

    To check if the TV timers are set, press the Smart button on the remote controller.
    Select Settings > TIME, then press WHEEL or ENTER.



Off Time - Turns the TV off at a preset time each day.  Check if Off Time 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 the Sleep Timer has been set. 


Note : If the TV is turning on by itself, then set the On Time to Off.

4. If following above steps did not solve the issue, reset the TV by unplugging it from the wall outlet or power bar.

5. Wait for 30 seconds before plugging in the TV power cord.

6. Turn on the TV. If the TV continues to intermittently power on and off, contact LG customer service.



If not a Timer issue, there have been occasions by which a television will turn off by itself then reboot. This usually happens with heavy video streaming viewers. The TV turns off on account of lack of memory/cache overload to clear out a lot of that unnecessary stored information.


The occasional alert message “This app will now restart to free up more memory” may appear prior to executing shut-down.


Causes: Cache overload

  • Heavy streaming user not exiting/closing app (i.e. Netflix, YouTube) when done
  • When QuickStart+ function is on, TV does not clear memory when powered off

Please do not replace Main board

  1. In User Menu turn the QST+ and SimpLink settings OFF
  2. Perform hard reset (unplug TV, wait 30 seconds, and plug back to AC power)
  3. Ensure the TV SW version is up-to-date
  4. Please EXIT streaming applications when done viewing.



If not a “Clear Memory Cache” issue and right before declaring television’s electronic components defective, is television reacting in the same fashion regardless of video signal source? Meaning, if this occurs only when viewing content from cable set-top-box and not from Blu-ray player, you may have a broken cable between the video source and the television. Consider switching cables around to confirm then, if the culprit, replace with a brand new set of wires.

IS THERE A BOSE SOUNDTOUCH sound bar connected to the LG TV? If yes and, in a dormant state when viewing television, please be cognizant of the following function of the sound bar:


Incident replicated at the factory. It so happens that when a BOSE sound bar is connected to an LG TV and not being operated, LG TV AUDIO SOUND OUT option set to TV INTERNAL SPKR or HEADPHONE, after 20 minutes of viewing TV, the sound bar, being completely inactive, sends a HDMI CEC command to the television to go into “stand-by” mode, therefore powering “off” the TV.


The BOSE sound bar features  “AUTO-OFF TIMER” function which through HDMI connectivity and CEC commands instruct all interconnected peripherals to shut down if sound bar inactivity has been detected after 20 minutes.



PLEASE ACCESS THIS FEATURE FROM YOUR MOBILE APP "BOSE SOUNDTOUCH" and DISABLE the feature. If you experience difficulties finding and disabling that function on your SoundTouch sound bar, please get in contact with BOSE Customer Service.


If all aforementioned troubleshooting tips did nothing in resolving your issue, then we must, regrettably, conclude there is something defective with the television. It could be a weak component such as a capacitor, a loose wire connection inside, a faulty LED strip, power supply or main board.

Please contact your respective LG Service Operations by locating coordinates from the website and clicking the appropriate subsidiary:


Then, scroll down the screen until you get to the area titled "LG Product Service and Support" as per below examples:


If you plan on providing feedback by filling below survey questionnaire, please ensure to provide the model number of your television so that we may investigate the matter more thoroughly.





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