First, you do reset TP-link to default factory and connect your computer by the cable to the LAN socket. In internet browser you write http://192.168.1.1 and admin/admin. Configure Internet Access...

Do you know - CMD, please give us first screenshot from ipconfig /all from your computer when you have internet access and second screenshot when you have problems with internet.

Try to enter DNS from your ISP 194.168.4.100 and 194.168.8.100 click SAVE and reboot router. After reboot you check connection and internet access.

DHCP server on my laptop is disable. On your laptop or on your access point? On your WA730RE it is ok, because your main DHCP server is on Thomson tg784n.

WAN addresses looks ok. When you have problems with internet access this addresses looks the same? We need to determine where the problem lies in WAN connection or in LAN connection. What is your...

Do you know configuration by the internet browser? There you will catch DHCP configuration.