My LG TV is connected to wifi even when turned off, what do?

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Use a power strip with a smart power down function. 

There is something fundamentally wrong with 

having more than five devices that use wifi.                         

Plug your LG TV into a power strip and when you want to turn it off, cut the power.

How in the f**k was that hard?

I hear you!  We also got an LG this June, and there are quite a few wi-fi devices in the house, like many people.  Even when the TV is OFF - my apps that monitor for intruders to my wifi show it as active!  I think it might be the fancy infra-red (no sure) remote; if we are watching TV, and one of us even bumps the coffee table upon which the mouse is lying - the red marker shows on the TV.  We cannot watch something on TV, and simultaneously look at IMDB to read the plot, without the phone slowing down *iPhone 8+).  And that happens even if we are not using THAT remote - the TV is connected to a big 5-speaker sound system, the usual boxes as well, and a dedicated new/small computer, for watching things available there, and using the OTHER 2 remotes.  If you shot everything off - all three main devices - then about 40 seconds later, one of the boxes turns on by itself, like Casper is in the room.  We are decent at all this stuff, and our son has a MM degree in digital music and recording tech, and he set it all up for us - and he lives 4 hours away.  He also has no answer - we have to wait until  he can drive from PA to NY without quarantining  If any of the things in OUR setup ring a bell with you - or any of the responders - I will be thrilled to know!

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To those who advocate cutting the power via strip, etc - this will often enter a set up mode of sorts that causes reboot of your provider connection, etc.  Does not sound like it would - but these devious critters communicate behind our backs. 

Make sure the TV is actually off, and not just in standby/sleep mode. None of my Wi-Fi enabled devices show as connected, when actually turned off, if Wi-Fi on that device is turned off. 

Also make sure that all devices ARE NOT set to auto connect to Wi-Fi. This may very well be the reason any device reconnects, after it has been disconnected, especially if the devices wakes when a connected Bluetooth/Infrared accessories, are bumped or touched, which tells you it is in sleep or standby, rather than OFF. 

Unplug it from the wall..........