Power TV shuts off after 3 to 5 seconds have switched all outlets still 3 to 5 seconds then shut off

The only clue is that you posted to Television and Video.
All questions need full 'make model (what it is)' as first 3 words.

Check your power source.
You may also have an issue with your outlet. Try plugging the television into a different socket, preferably one not connected to a light switch. Or it could be a problem with your surge protector; if you've been using one, unplug the TV cord and connect it directly to a wall outlet.
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Help library: LG TV Powers On and Off Intermittently ' LG CA

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Seems to be a power issue.
-Overheating
-Short some where in the circuit
-Outlet Issue

Would advice the get a Tech so check/follow the power & check outlets.

AK

Do a Power Reset.
1. Turn off TV.
2. Unplug the power cord of the TV from the electrical outlet.
3. Let the TV remain without power for 60 seconds.
4. Plug the power cord back into the electrical outlet. (If the television is plugged into a power strip or surge protector, remove it from the power strip or surge protector and plug it directly into the wall outlet. If the issue is resolved, the problem is with the power strip or surge protector and not the television.)
5. Turn on the TV.
If issue persists after doing the steps, reset the TV to factory default settings.
1. Turn on the TV.
2. Using the supplied remote, press and hold the UP arrow button.
3. While holding the UP arrow button press the POWER button on the TV itself.
4. When the TV goes off, release the POWER and UP arrow button.
5. The TV will turn on by itself and the initial setup screen will be displayed. Just follow the on-screen prompts to finish the setup.
Sony KDL 46V5100 random shut off 15 20 sec

Hello,
It sounds as if you are having problems with the AC Power reaching the television. Please verify the cord is firmly seated the tv's ac inlet
Also check the wall outlet (and power strip) by plugging in a lamp into it and see if it flickers when the tv shuts off.
Good Luck!
Rich Lilja

Try turnning your tv off, unplug unit from outlet, press and hold down the power button for 30 seconds, let go of power button, if plugged into surge protector try wall outlet, if plugged into wall outlet try a different outlet, power tv on using power button on tv. Did you have a storm in you're area?

This could be caused by lots of things.

Possible causes that come to mind are.

1. TV is over heating -

2. Power cord not securely plugged in the wall outlet.

3.lamp door cover, which could trigger the auto-shutdown switch - you can fix this on your self by correctly resetting the door cover witch.

4.The power board is Malfunctioning

You may want a local company come out and take a look because it's difficult to pinpoint the cause without looking at it. You can find a local shop google tv repair in google maps, or call 800-SAMSUNG for an authorized technician.

unplug remove the back "CAREFULLY" slide the the plastic board assembly out do not unplug anything check near the flyback for a large grey capacitor check for burn marks underneath it if no check at the front of the same board inside one of the heatsinks for a swollen capacitor if thats not it you need a flyback and or horizontal output

Possible fault on the power board or panel as the TV seems to shut off on a protection.
Need to investigate on these boards for any physical failure preliminary
before starting on a circuit check.