Hi the TV coming on the cut off

matthewhenry606 what make and model is your TV? When you say it is coming on, does it show you a picture? Does it have sound? How long before it turns off? Does the power LED turn off as well? Give us as much information as possible.

This is usually caused by the TV going through a self check and finding something wrong. It may turn off to protect itself. Could be a power board issue but could be many more things.