Hi  @Ziyad123,

If only one or some of your devices like your PC/Phone can access the internet, but other devices like TV can't connect to the internet, please try the below:
1. Please connect the Ethernet cable from your modem or internet service provider to the Router's WAN port. 
2. Check if the router has configured a parental control profile and remove the device from the profile.
3. For wired devices:
1) Connect the device to other LAN ports instead of the IPTV port you configured//set up earlier on the router.
2) Change the Ethernet cable.
3) Switch to another LAN port on the router or the device.
3. For wireless devices:
1) Enable the guest network and connect the device to the guest network.
2) Enable a hotspot Wi-Fi on a phone and connect the device to the hotspot WI-FI. Please reach out the device support if this doesn't work.
4. Change the DNS server: How to Change the DNS Servers on a TP-Link Wireless Router (New UI).
5. Reset the device to factory default settings.