TCL TV line keeps restarting or will not stay on

The checks in more detail

unplug the TV for at least sixty seconds, and while it is unplugged hold the physical power button for about fifteen seconds, which drains residual charge; plug it directly into the wall and try again. If the TV starts with its own button but not the remote, the remote is the fault, so check battery placement and pairing. Disconnect every HDMI device, USB drive, soundbar and streaming stick, then reconnect them one at a time, since a stuck device can hold the TV in a restart loop.

Look for signs of power such as a standby light, a brief flash, a start-up screen or sound, because those mean the TV is on and the display is the problem. TCL says to contact support if there are no lights or sounds at all, the cord is damaged, the TV powers off again immediately, the standby light flashes continuously, or you hear unusual electrical sounds. Keep the box and a photo of the label with the model and serial number, since warranty and service requests ask for both.

A TV mounted on a wall hides its label, so take the photo before hanging it. TCL also says a TV that restarts by itself after power returns may be reacting to a stuck HDMI device or a failing power supply, so note whether it restarts with everything unplugged, because that one observation separates a device fault from a set fault. If the TV starts but shuts off after a few minutes, note the time it takes, because a fixed interval such as a sleep timer or an eco setting is a settings fault while a random one points at heat or power.