Hi my name is ***** ***** I will be the expert working with you today to help resolve your problem.
Televisions sometimes gets static charged after which it stops responding the buttons and on remote as well.
Unplug the power cable of the tv from the wall socket leave it turned off for 5 mins
while the power is unplugged push and hold down the power on button for 30 seconds and then release it.
replug the power cable and then tv should respond well and fine.
let me know if you have any question