Step1： Check if you set the time in the clock menu- on time.
Reason： TV will be switched on when the set on time reach.
Solution： Cancel the on time that you set.
Step2： Check if you set the time in the clock menu-off time.
Reason：TV will enter standby mode when the set off time reach.
Solution: Cancel the off time that you set.
Note：Within 15 minutes there is no signal, the TV will auto sleep.
Remark : This function is not available in all model
Please call service when your TV not ok after above operation.