Hello @gallovdaniel
Thanks for reaching out here in the Community.
We would recommend starting with the troubleshooting steps in this link: Why is my Roku® voice remote not controlling power and volume on my TV?
If still no dice, please be advised that remotes for Roku TVs are manufactured directly by the TV manufacturer. We suggest reaching out to the TV manufacturer's customer support team to report the issue and get help.
You can contact them here: Support | Philips
All the best,
Kariza
Kariza D.
Roku Forum Moderator