How can I screen mirror my iPhone to a lg tv
How do I screen mirror to a smart lg tv
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You'll need to use an AirPlay-compatible device. That might be the TV itself, but if the TV is not compatible, you'll need to use an Apple TV, Roku box, or other similar in-between device to make the connection. Here are the directions for connecting:
Use AirPlay to stream video or mirror your device’s screen - Apple Support