@LukasHe 

Hi, when you connect a wired computer to the LAN port 1 or 4, will the Ethernet LED on the AX73 light up or the computer recognize the Ethernet connection or not?

If not, please try different Ethernet cables, or try to use the same cable and same wired device to connect other LAN ports to confirm if the port 1 and 4 are defective in hardware. Try to reset the router to factory defaults by holding reset button, If the problem still happens only with the port 1 and 4, you will need to contact the retailer where you bought the router to check warranty and get it replaced.

Hi @LukasHe 

You can also try to check the IPTV settings in your router's web-interface before resetting it to default. 

Go to "Advanced" > "Network" > "IPTV" and check if the IPTV function enabled. If it is, then check what mode is it set to. You should see something like this:

Check to which mode LAN1 and LAN4 ports are set. If you're connecting a PC or other devices like that, then it should be set to "Internet" mode.