Use a Timer with multiple settings.

Plug it in to a lamp timer, and leave its switch turned on.

Most TVs don't operate like lamps. If you unplug a TV, and then plug it back in, it will not come back on until you press the power button on the remote.

There are multiple "smart" plugs that you can get. I have Sonoff smart modules and their interface module which connects to my router. Most anything plugs into the module and then you can control it from your phone anywhere you go with Internet access. The app also allows you to program on/off times as you desire. The app I use is eWeLink but I think there are many ones out there. Takes a bit of setting up, but very easy to use.

Digital Picture Frame
 

We have a MaxAngel Digital Picture Frame - Model 102KZ. We purchased it to start and stop family photos changing every 30 seconds. It runs continuously according to whatever start and stop times we select. Our children can send us photos and videos via the internet which enter our Picture Frame directly. It's a family shareable Digital Picture Frame that also has audio.

This could be used for your purpose using non family photos.

This is a hilarious thread! Nothing here would prevent someone figuring it all out, except for 1 (only 1 answer) . That is Samsung (Smart Things app) which would allow the remote control of the TV and channels etc. What y'all are missing is it has to be RANDOM! All patterns are detectable, even if I had smart lights, they would never be set to the same time every day. That's just asking for it.

You can purchase a Kasa smart plug for about $10. It needs wifi to initially set up with the Tapo app.
Once set up, you can set a schedule for when the plug turns on/off.

The plug will then turn on/off per that schedule (even if your wifi is down). And if your wifi is working you can manually turn on/off the plug from anywhere in the world with your smart phone or tablet using the App.

You plug this device into your wall socket and plug your TV into this device

Some posters are suggesting that you can control a TV with wall plug and/or a timer. These are not solutions because the TV will not come back on by just plugging it in. You need to press the power button on the TV remote control after you plug it in.

Install a home security system

I'm surprised folks don't feel safer, given we spend millions of dollars for "Community Watch".

No consensus on this thread that folks are feeling unsafe. A poster asked a question and got a lot of suggestions.

This seems like a paranoid, silly solution to a problem that probably doesn't exist. I've never heard of a break-in in my TV neighborhood ever other than in situations where ex-spouses or relatives are involved. There's tons of empty homes in TV that can be spotted a mile away with zero lights on for weeks/months that any potential burglars would surely target first.

Also, do most people actually have anything worth stealing anymore? Other than my vehicle and golf cart, I can't think of anything in my home outside of furniture or appliances that I paid more than $1000 for, which would be worth pennies on the dollar if resold.

Samsung, Sony and some other brands allow you to set “On” timers for various days of the week.

This video shows you how to do it:


https://m.youtube.com/watch?v=9sIG_omnXEM

tv timer
 

Just buy a TV from the early sixties.

LOL. But, note that today, most people don't use the tuner in a TV. They get their content from a cable box or from a wifi-connected streaming service and/or device. The TV is just used as a monitor.