I cannot turn on the TV using voice recognition
This can be the reason
Quick Start+ is off.
Is your Quick Start+ turned on?
Follow below steps to turn on the Quick Start+
How to turn on [Quick Start+]
Press settings ( ) button from the remote control → Go to [All settings] →[General] →[Additional Settings] →[Quick Start+]→[On]
1 Turn on the TV and press [Settings] button from the remote control.
2. Go to [All Settings]
3. Go to [General] and then to [Additional Settings]
4. From [Additional Settings], turn [ON] the [Quick Start+].