I had the TPG ADSL 2 Modem for the last 5 years and the Samsung TV ran perfectly fine. However in the last 2 days i have upgraded to the NBN using TP Link Vr 1600v however the TV doesnt detect the WIFI connection. Every other device, Iphones, ipads etc have been able to connect.
Samsung say its fine, the modem is only 4 metres away in clear site
What troubleshooting have you done so far?
Have you tried to turn on and off the smart TV's wifi?
Changing modem/router's channel might also fix this issue.
How do we do this on the TPG Supplied Modems?
Credits to @Manuel
To see more details/benefits of changing wireless channel you can visit the original article here
Hope this help.
Let us know how it will go.