To check if your LG TV is using the correct wireless channel, first go into your TV's settings menu. Then, navigate to the network settings page. This page should provide a list of all the available networks in your area. Select the network that you're using for your LG TV and it should display the wireless channel it's using. If the channel is not correct, you can switch it manually. Once you've done that, make sure to save the settings and restart your TV. That should help your LG TV connect to the network properly.