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LG TV Powers On and Off Intermittently

Operation

TV POWER CYCLES ON & OFF


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.


On / Off Timer menu feature option


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.

Cache overload on screen message notification


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


Solution:
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:

Sound bar automatic shut off timer feature


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.


Sound bar mobile application


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.


Some customers have reported having resolved their issue of TV powering “on/off” intermittently simply by deactivating the Quick Start+ feature in the on-screen menu.

Quick Start Plus menu feature option


Others reported having achieved success in resolving the issue by un-plugging the AC cable from the rear of the TV and the AC wall socket then re-inserting both ends ensuring lug terminals fully inserted. Then, firmly but gently tap the rear panel with the palm of your hand to shake off the accumulated dust inside on the Printed Circuit Boards.

Firmly and fully insert power cord at both ends               Firmly and fully insert power cord to wall A C outlet


If all above fail at resolving issue, please try a Factory Reset:

Reset TV to initial setting steps to follow

Reset TV to initial setting on screen menu option


It has been observed on some Internet forums that some HDMI-CEC devices, i.e. Amazon FireStick, when the batteries run low or are dead, the peripheral causes the TV to intermittently turn itself on/off. Changing the batteries, disabling the HDMI-CEC feature on peripheral or turning off the SimpLink feature on the TV appear to have fixed the issue.


Some customer feedback comments:


“I have a LG UK6300PUE Smart TV that, due to a butt-operated Fire Stick voice remote, started to cycle on/off on a regular basis.  Despite numerous hard resets of AC power, disconnecting all attached devices (router, laptop, Fire Stick), continuous operation of the remote (power, home, input, settings, etc.) the cycling continued when set was plugged in.  I eventually used the Fire Stick remote to voice control the set to turn off, then on.  Cycling stopped. 4 hours of my life wasted.”

 
“CEC control using Alexa voice commands on Fire Stick turned out to be the culprit. My LG Smart TV started to cycle on then off with about a 5 sec period.  The cycling continued even after disabling Fire Stick. After an hour of disconnects and reboots, a single voice command on my Fire Stick remote to turn LG TV off did the trick. After repowering, cycling was eliminated.”

 
“Low battery on Fire Stick remote DID cause LG OLED to turn off and on rapidly. Thanks as in business for 35 years and never would have figured out. Had it down to TV, but changed batteries in remote and done. Had me freaking about my high dollar TV! Thanks.”

“It worked.  Turned off quick start and unplugged fire stick and turned off SimpLink and it did the trick.”



  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 to request a Repair Service.

American residents (USA) please click the following link:   LG Electronics USA

British residents (UK) please click the following link:           LG Electronics United Kingdom

Residents of India please click the following link:                LG Electronics India

Residents of Australia please click the following link:          LG Electronics Australia

Residents of Canada whose TV is under warranty:             LG Canada Request Repair Service

Residents of Canada whose TV is out-of-warranty:             LG Canada Request Flat Rate Repair Service



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.