The reason why there is no screen projection equipment for TV screen projection is because the mobile phone and TV are not in the same network, and screen projection can be realized by connecting TV and mobile phone to the same network. The specific operation steps are as follows:

1. Turn on the projection screen and projection switch in the TV application, and then connect the mobile phone and TV to the same network.

2. Find the video to be projected on the TV on the mobile phone, open it, and click the three points in the upper right corner to pop up the menu options.

3. Click the menu that appears again, select the projection screen, start searching for devices, and click the connection of the searched devices.

4. After the mobile phone is successfully projected, the TV starts to play the video in the projected content, and the mobile phone can return to do other operations.

5. After the screen projection is completed, the TV screen starts to play the video content transmitted by the mobile phone normally, and the TV screen projection is completed.