Powers off after 15 seconds to 1 minute

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.
May 18, 2021

TV turning on and off by itself? Here's why-and how to fix it

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I turn on my TV then after a few minutes shuts off what's the ...

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When I turn it on it shuts off after a few seconds. It's a

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Help library: LG TV Powers On and Off Intermittently ' LG CA

LG Electronics https://www.lg.com > Home > Support > Troubleshoot
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REPLACE LAMP IF PERSISTENT REPLACE THE LIGHT ENGINE COS THE COLOR WHEEL IS WORN OUT

You either have a cold solder joint in your horizontal deflection circuits or your or in your horizontal output circuit. please be careful due to the fly-back transformer still holds power even unplugged until you discharge it.( ground it out). Hope this helps.

I have the exact TV and had the exact same problems. It is the light engine with color wheel that needs to be replaced, and they are VERY hard to come by for this model. Our repairman has had our TV for 5 months and still cannot locate a vendor that carries the part. He said according to Toshiba, the part has been discontinued. If you happen to find one, please post. I'll do the same.

tap on the power supply borad not to hard
and have some one let you know if pix fark out
go all thur all the board soune like you have bad solder jonts

i think the convergence amps are weak, or the akb circut has caused the tubes to go bad, google your model number to see if it is in the tube problem. sony made some projos w/ bad tubes in them. tv lasts only three or four years,no cause i had one

Which lights are lit on top of the amp when you power it up?

Which ones light up during the 15 seconds that it's on?

Are you running a signal sensing system or are you turning the amp on via the remote lead?

Is the signal sensing switch set to on or off?

You have a backlight board problem

I had the same problem, it because of heat buildup, and the inside is fried, you need repair

I would suggest that you guys turn the unit off when this happens, unplug the unit for 30 seconds, plug it back in, and see if this helps. If this does not solve your problem, you should call 1-800-448-2244, so a service center in your local area can be found for further assistance.