How-To

LG TV Keeps Turning OFF (PROVEN Fix!)

For some reason most LG TVs eventually run into a similar problem – they keep turning off.

There are countless cases of LG TV owners who say they’ve had this problem – some say it’s been an issue they’ve dealt with for multiple years!

Luckily there is a very easy fix that should resolve about 80% or so of LG TVs that turn off by themselves.

Why Does My LG TV Keep Turning Off?

There are several possible reasons your LG TV keeps turning off:

  1. Your TV needs a reset
  2. The Simplink (HDMI-CEC) feature is turned ON
  3. Eco Mode is turned ON
  4. Certain Timers have been left ON
  5. Problems with the power supply
  6. Your TV is overheating
  7. Your TV’s software needs to be updated
  8. There is short in the cable that connects your main board to the power supply board
  9. Capacitors on your TV’s motherboard have failed

We’ll start with some of the easier solutions and then we’ll move on to some fixes that require you to take your TV apart.

Reset your LG TV

Often times, you just need to give your TV a good old fashion reset. There are a few ways to go about this.

First, try a power reset (also referred to as a power-cycle):

  1. Turn off your TV and unplug it. 
  2. Hold down the Power button on the TV for 30 seconds
  3. Now, connect the TV to the outlet. 
  4. Turn it on and check if the problem persists.

This will help to drain any residual power left in the TV and allows the TV to soft reset itself. This is different than simply switching the remote on and off!

Alternatively, if your TV keeps turning itself off, you can try a hard reset. This method reboots your TV to its factory settings, meaning you would lose all the information and settings you had. 

With the TV powered on (hopefully unplugging it or removing the remote batteries was able to temporarily power the TV) click the Gear icon at the top of your remote.

Then go down to All Settings (Advanced Settings) > General > Reset to Initial Settings. Your TV will turn off and on again and then display the initial setup screen.

This will essentially restore your LG TV to the settings it had on the day you purchased the television. That means all account settings will be removed, and any installed apps will be deleted!

Simplink (HDMI-CEC) is ON

HDMI Consumer Electronics Control (HDMI-CEC ), is an HDMI feature that helps your connected devices work better together.

It gives your HDMI connected devices partial control over your TV, and your TV partial control over your devices.

For example, with HDMI-CEC you could control your DVD player with your TV remote. Or your DVD player could automatically change your TV’s input to HDMI when it turns on.

In some cases, by default, HDMI devices are configured to turn the TV off automatically when they turn off.

LG calls this feature Simplink (also known as HDMI-CEC) and since your TV is turning off by itself, you should look into this.

  1. Press the HOME button on the remote control and select Setting icon at the top right.
  2. Go to All Settings icon >  General and select SIMPLINK (HDMI-CEC).
  3. Set SIMPLINK (HDMI-CEC) to OFF.
  4. Configure the Auto Power Sync settings to OFF.

Keep in mind that you will no longer be able to use your TV remote to control any other devices.

Wait to see if disabling Simplink solves your issue. If it doesn’t there are several other high probability reasons your LG TV is turning off.

Eco Mode is On

LG TVs also come equipped with something called Eco mode. This mode automatically controls various settings on your TV to save power whenever possible.

Sometimes these settings can take on a life of their own and its worth turning them off if you’re already experiencing some issues.

To disable Eco Mode:

  1. Press the Home/Start button on your remote
  2. Select Settings
  3. Select General (> Additional Settings)
  4. Click on Eco Mode
  5. Make sure it is OFF!
turn off eco mode on lg tv

Timers have been left ON

Like most TVs, LG TVs come equipped with a variety of timers. These timers include “sleep timers” that automatically shut your TV off at a certain time.

It’s possible that one of these timers is ON and simply needs to be shut OFF.

To shut off all timers on your LG TV press the HOME button > Settings > All Settings > General > Timers.

Problems with the Power Supply

Sometimes the answer to the problem is as easy as double-checking the power cord and outlet.

If there’s not enough power, your LG TV won’t be able to keep itself on, leading to automatic turn-offs after five seconds. 

If this is the problem, here’s what you can do: 

  1. First, check for any power issues in the power cord. If you notice it is broken or damaged, you need to replace it. 
  2. If the problem persists, the next step is to check for power problems with the outlet. Unplug your TV and connect it to a different power outlet. 
  3. Alternatively, connect another electronic device to the outlet to see if the outlet you’re trying to use actually works or not.

Note: The problem could also be a surge protector or extension cord you’re using. Double-check those as well before replacing your power cord.

Ideally you can get rid of the surge protector and extension cords altogether and just plug the TV directly into the wall to see if that fixes the problem.

Your LG TV Is Overheating

Your LG TV might also turn itself off automatically because it lacks proper ventilation. 

Without good airflow and ventilation, your TV can overheat and malfunction. 

If that’s the case, here’s what you can do: 

  1. Disconnect your TV. 
  2. Remove all dust from the back of the TV using a dry microfiber cloth. 
  3. Ensure nothing is blocking the TV vents as a blockage can prevent ventilation, leading to overheating.

You can also try changing rooms to one with better ventilation or install an air conditioner to keep the room cool. 

Your LG TV Needs an Update

A Smart TV needs constant updates to ensure that the system works perfectly. So, if your TV is behind on its software upgrades, it can malfunction. 

All you need to do is look for the newest firmware update available for your TV model.

To check automatic updates:

  1. Press the Home/Start button on your remote
  2. Select Settings
  3. Choose All Settings
  4. Select General
  5. Go down to About this TV
  6. Ensure that Automatic updates is checked. You can also Check for updates here.

However, you will need to be connected to the WiFi to download the updates this way.  

A way around this is to update your LG TV software manually. To update your LG TV software manually:

  1. Find the applicable Product Support Page
    1. Go to the LG Support Home Page
    2. Type in and select your TV model number
  2. Download the file and unzip it (right click, Extract All)
  3. Put the file on the USB
    1. On the root of the USB drive, create a folder and name it “LG_DTV”
    2. Place the unzipped file into this folder (file type should be EPK)
  4. Insert USB into the back of your TV
    1. Follow the instructions on the screen

Your LG TV has a Power Short

If you take off the back panelling off your LG TV, you’ll notice a cable that runs connects the main board to the power supply board.

This cable is known to occasionally cause a short between these boards, resulting in the TV turning on and off.

By disconnecting the fourth pin from the top of this cable connection, you’ll remove the short and resolve your problem.

To do so, push in and then pry up, pulling out the cable. This will stop the signal that’s shorting out your TV, causing the main board to automatically reboot.

The Motherboard Is Failing

Unfortunately, another reason your TV turns off every 5 seconds is that the motherboard is failing. 

The motherboard facilitates all of the electrical connections within the TV and enables various system parts to communicate. If it fails, then the TV fails.  

Specifically, the problem is usually with capacitors on the motherboard that have failed. Capacitors can fail for a variety of reasons, but more often than not the cause is a surge of electricity during a lightning storm.

The best thing you can do is get the motherboard professionally serviced or buy a new one altogether. 

However, if you’re feeling adventurous, you can take off the back panelling of your TV and look at the motherboard more closely for any capacitors that look swollen.

If you think you’ve found the culprit(s), buy new ones and replace the bad ones.

Conclusion

LG TVs are some of the most durable options on the market, but they are not perfect. They can malfunction just like any other TV. 

Here are some reasons why a LG TV keeps turning off: 

  1. Perhaps your LG TV just needs to be reset. Power-cycle and/or factory reset your TV.
  2. Anynet + (HDMI-CEC) is turned on and some other connected device nearby is controlling your TV, turning it off. You’ll need to turn Anynet + OFF!
  3. Energy saving “Eco Mode” is on and is automatically turning off your TV. It needs to be turned OFF.
  4. Certain timers have been enabled, like the Sleep Timer (for instance). Turn all timers OFF.
  5. There’s a problem with the power cord or socket. If that’s the case, replace the cable or switch sockets to solve the problem. 
  6. Your TV lacks proper ventilation. Clean the back of the TV and remove all dust. You can also change rooms for one with better airflow. 
  7. Your LG TV needs an update. Check for firmware updates regularly to avoid this problem. 
  8. There is a short in the cable that connects your main board to the power supply board. Disconnect the 4th pin from the top of the cable connector to remove the short and resolve the problem.
  9. The motherboard of the TV is failing. In this situation, you need to have your TV serviced or buy a new one. 

Hopefully one of these troubleshooting steps helped stop your LG TV from turning off by itself!