Sharing your phone's screen with a TV isn't supported. Here are a few ways to share your screen with a media server or PC with the LG SmartShare app installed. A compatible display or additional accessories may be required. Check with your computer or media server manufacturer for additional support.
For more info about the SmartShare app, see this page.
Configure these settings to share files with a DLNA-enabled device (e.g., TV, game console, etc.). To determine whether your device supports the DLNA standard, see this product database.