You can choose what screen your TCL Roku TV will display upon powering ON.  By default, your TV is set to display the Home screen as shown below:

You also have the option to specify the input type you want your TV to display when powered ON.  Here are the step-by-step instructions:

1. Press the Home button on your TCL Roku remote control.
2. Scroll down to Settings
3. Press the right arrow button and select System 
4. Press the right arrow button and select Power
5. Press the Right arrow button to select Power On
6. Press the Right arrow button and highlight the input that you would like displayed when you power on your TV.                    
7. Press  on your remote control.  A check mark should appear next to your input selection.
8. To confirm changes are applied, power OFF your TV then power it back ON.