There are three reasons and solutions for why TCL TV keeps showing boot screen.
1. No signal source selected
Press the signal source button on the remote control, and select the signal source input to the TV.
2. TV freezes
If the TV freezes, you need to force restart the TV. Replug the TV cable, then try turning it back on again to see if it returns to normal.
3. TV systems are being upgraded
If the TV system is upgraded, it may also stay on the boot page. No need to power down, just wait for the update to complete.