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LG TV Powers On and Off Intermittently

LG TV Powers On and Off due to Overheating

LG TV Powers On and Off due to Overheating

All electronic devices generate heat the moment their respective printed circuit boards are in operation. As such overheating may sometimes cause the TV to power off. Refer to this article for more information about overheating

LG TV Powers On and Off due to Timer

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, Smart button on the remote controller. Select Settings > TIME, then press WHEEL or ENTER.

  4. On / Off Timer menu feature option

    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.

    Note : If the TV is turning on by itself, then set the On Time to Off.
  5. If following above steps did not solve the issue, reset the TV by unplugging it from the wall outlet or power bar.
  6. Wait for 30 seconds before plugging in the TV power cord.
  7. 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.

LG TV Powers On and Off due to Cache / Memory Issue

Cache overload on screen message notification

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 get Main board replaced. Futile!

Possible Solutions

  • In User Menu turn the QST+ and SimpLink settings OFF
  • Perform hard reset (unplug TV, wait 30 seconds, and plug back to AC power)
  • Ensure the TV SW version is up-to-date
  • 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.

LG TV Powers On and Off due to HDMI-CEC connected peripheral device such as a BOSE Sound bar, Firestick, Cable Decoder box, etc.

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.

NOTE: other peripheral devices featuring HDMI-CEC commands have also been found to interfere with the television.

This has happened to me a few times and many customers have reported the same as well. Falling asleep with the TV on and waking up to an update dialog on screen prompting me to either apply the update now, change the update schedule, or skip. If neither option is clicked within 5 minutes, the box will update on its own and reboot.

The Rogers Ignite set-top boxes, for example, do check for firmware updates and TV Guide updates in the middle of the night (by default between 2 AM and 4 AM) and do restart after applying the update. If it so happens that the Ignite decoder boxes’ HDMI-CEC setting is enabled, chances are, if TV HDMI-CEC setting is activated as well, the decoder box will wake up the TV in the middle of the night. Either disable both devices’ HDMI-CEC or at least one of them to avoid those middle of the night undesirable surprises.

NOTE: HDMI-CEC stands for Consumer Electronics Control which means certain commands only need to be executed once on a single device to activate same for all other interconnected peripheral devices.

Other solutions

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.

On webOS 23

Go to General > System > Additional Settings > Quick Start

quickstart menu

On webOS 6.0 and web22

Go to General > Devices > TV Management > Quick Start

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:

Go to General > System > Reset to Initial Settings

Factory reset menu

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.”

Isolated Cases:

From time to time, customers might experience some oddball issue that is still unknown to LG engineers. Should it be the case, we must carefully examine the problem in-depth. There are programming discrepancies that accidentally slip through. It happens.

Anytime such an issue is experienced by a customer, it should be urgently reported to LG Electronics so that our software engineers may investigate, identify and get some resolution going.

We would appreciate you providing us as much detailed information as possible by contacting LG and reporting the anomaly.

Please provide TV model number, serial number, app, feature or video signal source causing occurring issue and some screenshots (if possible). It would be tremendously helpful and appreciated.

Note :

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.

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.