You are likely using one of two standards: USB-C Alt Mode or MHL (Mobile High-Definition Link). Power on the television first, then turn on your phone, and the screen should automatically sync.
iPhone Connect TV USB Method: Step-by-Step Connection Process
Start by powering off both your television and your phone to prevent any potential damage to the ports. Cheap, unbranded cables can result in compressed video or audio delays.
Connect one end of the HDMI cable to the adapter and plug the adapter into your phone. If you see a "No Signal" message, double-check that the adapter is seated firmly in the phone port and that the HDMI cable is plugged in tightly at both ends.
iPhone Connect TV USB Method: Step-by-Step Connection Process
Step-by-Step Connection Process Configuring the TV Input Source If the television does not display your phone screen immediately, you likely need to change the input source manually. Another common issue is the television failing to recognize the connection due to insufficient power; most adapters require power, and if the TV port cannot supply enough, you may need a USB cable that connects to a separate power adapter to keep the phone charged and powered.
More About How to connect my phone to tv with usb
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