@John_23 

The user guide manual might provide more information and walk-through on how to setup IPTV and what version. Normally, if the setup is not compatible the router will gray out the settings. For example, turning on NAT Boost will gray out some of the QoS or Traffic Logging option. Review the user guide, perform trial and error, post here to the community of your results.

https://www.tp-link.com/en/support/download/archer-a5/

@Godzilla 

Thanks for reply. Well, if i use access point for the operation mode, the IPTV function do inacessible. However, if i keep using as wireless router mode for operation mode, and changing the IP to, 192.168.1.1, i can still access the internet, and the IPTV option is available. however, when i enabling it, my internet access is gone. So perhaps the router need some tweaks to make it work or it just this router can not support IPTV if being second router. =/