How to mirror iPhone to LG TV?

do the tv support it?

my lg does but doubt all models do,

mine show up along side my appletv box

maybe it can be disabled and enabled in the tv's settings though

otherwise you can try to force restart the iphone

Force restart iPhone - Apple Support

and of cause if the iphone and tv are operating on different networks such as

wired/2.4Ghz/5Ghz then the wifi router needs to be set to bridge the network types

LG TVs can be hit or miss with AirPlay, but if yours doesn’t support it, there are still ways to mirror your screen. DoCast is a good option since it lets you both mirror and stream videos, which not every app does.

Some people go with the Screen Mirroring App, but that one only offers basic mirroring - no direct video or photo streaming. Also, the Replica app does both, so it’s worth a shot, too.

Honestly, these apps all have their little quirks, so the best move is to try a couple and see which one works best with your TV. 

If you don’t want to deal with Wi-Fi or app limitations, just grab a Lightning-to-HDMI cable and connect your iPhone straight to your LG TV. It’s old-school, but it works every time.

I also own an LG TV, and streaming through AirPlay works seamlessly. Recently, I bought a new TV - my model is UN85, and as I understand, it has built-in AirPlay. My old TV didn't have it. What's your model?

Above, some mirror apps were suggested. Give this one a try: https://apps.apple.com/us/app/docast-screen-mirroring-to-tv/id6446948344

It quickly connected my iPhone to the TV for smooth streaming.