1. Replace the battery of the remote controller with a new one, and check whether the positive and negative poles of the battery are installed correctly, and then try the voice remote control function.
Secondly, the remote control is too far away from the TV, or there is an obstruction in front of the TV. Bluetooth remote control will be better than infrared remote control.
3. Finally, check whether the voice function is turned on in the settings. If it is not turned on, select Turn on Voice to restore voice function.