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LG TV Won’t Turn Off or Keeps Turning On and Off Itself

LG TVs feature sharp graphics and built-in speakers that enhance the viewing experience for those who enjoy movies and TV shows. However, if your TV begins to malfunction, it can rob you of that remarkable streaming quality. LG consumers often run a particular problem: a TV that turns on and off (or won’t turn on and off) uncontrollably.

LG TVs that won’t turn off either have a problem with the remote control or motherboard. But if your television continues to power down automatically, there could be a wiring problem, or you may need to reset it. Disconnect the TV, disable timers, or delete your LG TV’s cache to solve the issue.

TV channel changing

This article will explain why your LG television continues to switch on and off on its own. We’ll also walk you through troubleshooting procedures to return your LG TV’s functionality!

LG TV Keeps Turning On by Itself

Person watching TV

One reason your LG TV may switch on automatically is due to its SIMPLINK settings. SIMPLINK is a feature that allows you to use the remote control for your television to control the simple functionality of other gadgets. SIMPLINK also connects the features of your television to other tech devices.

If the Auto Power Sync feature is active in the SIMPLINK settings, powering on a device connected to your television also powers the TV. As a result, the television seems to be malfunctioning while operating, according to this link.

You can deactivate SIMPLINK by taking the steps below.

  1. On the remote control, press the Home button.
  2. Navigate to the Settings section.
  3. Move to General.
  4. Select SIMPLINK.
  5. Set the Auto Power Sync option to off.

If SIMPLINK isn’t the problem, the issue is likely the main control board of your television.

How To Replace LG Motherboard at Home

Before attempting to replace the motherboard on your unit, it’s worth noting that LG consumers often misdiagnose this problem. As a result, it’s best to seek specialist assistance in diagnosing and repairing your panel.

However, if you believe that your motherboard is causing the automatic powering issue, keep an eye out for flashing images, occasional blue screens, a sluggish TV, or a lack of recognition for connected devices.

If you notice either of the above additional symptoms, conduct the following examination to see if the motherboard is defective before attempting repair:

  1. Remove the TV’s power cable and disconnect external devices.
  2. For fifteen seconds, hold down the television’s power button.
  3. Wait for one to two minutes.
  4. Reconnect the power wire.

If the issue continues, it’s best to replace the television’s motherboard. Switch the board with an OEM substitute and have an electrician install it. However, you can also replace the control panel if you have a flat screwdriver, needle-nose pliers, and a Phillips screwdriver.

How To Replace an LG TV Motherboard

After you have the proper equipment, here’s how to replace the motherboard:

  1. Unscrew the backplate.
  2. Manually disconnect the cables from the damaged motherboard.
  3. Squeeze the wire connectors with needle-nose pliers to unlock them.
  4. Disconnect the faulty mainboard.
  5. Using a screwdriver, secure the new control board to the chassis.
  6. Reconnect all cables. After reintroducing the ribbon into the connector, remember to close the top tab.
  7. Fasten the back cover.

LG TV Keeps Shutting Off by Itself Automatically

Person watching TV

When your LG system shuts down on its own, the power cord may be loose. Your first “fix” should be to ensure that the power cable is securely connected. It also helps to confirm that there are no physical damages to the wire.

Once you’ve established that the wire is secure, the issue could be with the equipment attached to your television rather than with the television itself.

When the batteries of some HDMI-CEC systems run low, the peripheral forces the television to switch off intermittently. If you have one of these devices connected, consider changing the batteries to solve your issue.

LG TV Keeps Turning Off and Turning On Repeatedly

Smart TV in modern living room

An LG television that powers on or off intermittently has one trigger: the timer function. To determine whether this is the cause of your issue, verify the presence of timers with these steps:

  1. On the TV remote, press the Smart switch.
  2. Navigate to Settings.
  3. Select Time and press Enter.

These steps will take you to the timer settings, where you’ll find three options:

  • On time: Powers the TV on at a set time.
  • Off time: Turns off the TV on a predetermined schedule.
  • Sleep timer: Automatically turns off the television after a predetermined amount of time has passed.

Disable the Off and On timers to stop your television from rebooting continuously.

If none of the preceding measures resolved the problem, reset your LG television. To start, unplug the TV from the wall outlet. After that, wait 30 seconds before plugging the television’s power cable back into the wall.

If your television still powers on and off intermittently, try deleting the cache on your television.

How To Delete the Cache From Your LG Television

If your concern is not due to a timer malfunction, your television is most definitely suffering cache overload, the most common issue on televisions heavily used for video streaming.

For some, an error note may occasionally appear indicating that the TV needs additional memory before shutting down. However, even if you haven’t seen this post, clearing your cache is still a viable option for resolving your problem.

To clear the cache on your LG television, follow the steps below.

  1. Using the remote, navigate to the Settings menu.
  2. Go to the User Menu.
  3. Disable Quick Start Plus.
  4. Disable the SimpLink configurations.
  5. Disconnect the LG unit from the wall socket.
  6. Wait approximately 30 seconds.
  7. Connect the power cable.

To avoid this problem in the future, always shut streaming apps down after you’re done watching.

LG TV Keeps Turns Off and Red Light Flashes

Couple sitting on sofa watching TV

When the LG television switches off automatically but still displays a blinking red light, there might be a problem with the main board of the television. Replace your control board by following the measures outlined above.

However, before you do so, take the following steps to assist in resolving your issue:

  1. Unplug the power cord.
  2. Allow approximately ten minutes to pass.
  3. For 60 seconds, hold the power button on the television.
  4. Plug the power wire in.

LG TV Won’t Turn Off

Confused male trying to fix TV

When your LG TV isn’t turning off, the most obvious solution is to power down the television by disconnecting it from the wall socket.

On the other hand, if the television turns off by the built-in power button but not via the remote, you can try troubleshooting the remote.

LG remotes come in two forms: magic and regular. You can identify the kind of remote control you have by observing the following signs:

  • Magic remote controls are equipped with a trackball. The mapping tool appears on the television screen in the same fashion as a mouse’s cursor.
  • Remote controls in the standard configuration are flat. On the television’s monitor, there’s no movable mouse.

Adjust the batteries as the first step in troubleshooting. This procedure applies to both remote versions. When changing the batteries, take care not to combine old and new batteries. Doing this can be hazardous.

You can also turn off the TV by ensuring no blockages between the controller and the device’s infrared sensors. Typically, this sensor is a flat panel that illuminates when the remote communicates with it.

The majority of tasks — such as powering down — are performed by an infrared light beam. Ensure that nothing is obstructing the line of communication to the television.

If none of the above troubleshooting tips resolved your problem, there’s a good chance that there’s a broken metal component, such as a:

  • Faulty LED strip
  • Weak capacitors
  • Broken power supply
  • Loose wire connections

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