Would like to know if my Tv set LG is compatible with my iPhone 11 Pro

Hi sandrine166,

It sounds like you're looking for help with AirPlay. If so, for assistance with starting the feature test the steps below found in the article here: Use AirPlay to stream video or mirror the screen of your iPhone or iPad

"Stream video from your iPhone or iPad to a TV or Mac

1. Connect your device to the same Wi-Fi network as your Apple TV, AirPlay-compatible smart TV, or Mac.
2. Find the video that you want to stream.
3. Tap AirPlay . In some apps, you might need to tap a different button first.1 For example, in the Photos app, tap Share , then tap AirPlay .
4. Choose your TV or Mac from the list.

To stop streaming, tap AirPlay  in the app that you're streaming from, then tap your iPhone or iPad from the list."

You can also check supported smart TVs from the list here: Home app - Accessories - Apple

Functionality may also depend on the app developer. If needed you can reach out to them with the steps here: How to contact an app developer

Cheers.

Depends on the model of the LG tv. Mine works fine.