If your Samsung Smart TV is engaging in power cycling, or turning off and then turning on again, it may need to be updated or have a damaged device. 

This guide by Fixwebnode can aid you in identifying and resolving the issue.

How to resolve Samsung TV Turning Off and On by Itself ?

1. Restart the TV

This is the simplest and most common fix.

To turn off the TV:

• Press the Power button either on the unit or on the remote.
• Then unplug it from the power outlet. 
• After 10 seconds, plug it back in.
• Finally, turn the TV back on by using the Power button.

2. Update your Samsung Smart TV

Smart TV firmware updates are utilized to enhance existing features, fix issues, and sometimes to install new applications to the device. It is advised you connect your TV to the internet in order to complete the update (recommended).

If forcing your TV to restart does not solve the problem, then you need to perform an Update on your TV. 

To do this:

• Give your remote's Menu button a press.
• Select Support.
• Now Select Software Update. Note: It is possible this area may be greyed out if the TV has just been powered on or you are accessing it through Smart Hub mode. If this is the case, wait a minute and then retry or go in after watching a channel from its own tuner.
• Turn on Auto update to make sure you have the latest updates. 
• If you want to manually check for an update, go ahead and press Update Now to trigger the search. 
• After the TV finds an update, pick Yes to initiate the download and installation. 

When the process is done, you can get back to enjoying your TV.

3. Check the power cord

• Inspect the power cord for any damage, such as cuts, fraying, or burns.
• If the power cord is damaged, replace it with a new one.

4. Disable the Eco Solution feature

The Eco Solution feature turns the TV off to save power when there is no input for a long time. This can sometimes cause the TV to turn off unexpectedly.

To disable it:

• Go to the TV's settings.
• Select General.
• Select Eco Solution.
• Select Auto Power Off.
• Select Off.

5. Disable the Sleep Timer

The Sleep Timer turns the TV off after a preset period of time. This can also sometimes cause the TV to turn off unexpectedly. 

To disable it:

• Go to the TV's settings.
• Select General.
• Select System Manager.
• Select Time.
• Select Sleep Timer.
• Select Off.

6. Reset the TV to factory settings

This is a drastic step, but it can sometimes fix the problem. Resetting the TV to factory settings will erase all of your settings and data. Make sure to back up your data before resetting the TV.

To reset the TV:

• Go to the TV's settings.
• Select Support.
• Select Self Diagnosis.
• Select Reset.

Here are some additional things to keep in mind:

1. The problem may be caused by a problem with the TV's power supply

If you have tried all of the above and the problem persists, you may need to have the TV's power supply repaired or replaced.

2. The problem may be caused by a problem with the TV's main board

If you have tried all of the above and the problem persists, you may need to have the TV's main board repaired or replaced.