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Hi Tammy and welcome to JustAnswer,
Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, please describe what steps taken when attempting to set the TIMER to turn off the TV automatically.
Hi again Tammy,
This Vizio model has only a SLEEP TIMER; i.e. it will power itself OFF after the minutes it has been set to has elapsed. Should this serve your purpose, please click HERE.
It has no other feature/function that can serve as an alarm clock.
I realize that the above information may perhaps be not what was expected. Unfortunately, it would appear to be a design / feature limitation; sorry for having to be the bearer of bad news.