You wrote you can't access the router which is odd. Is the router yours or someone elses?
You also wrote that "my PC and laptop aren't work fine" which makes me think that a HDTV would not work either.
I'd start over with my router and get my PC working first. Then I would get my HDTV working.
I bought a UE46ES6100 last week and have literally spent all week trying to get it connected to the internet. I've tried everything, i can connect to the modem but no futher. My ISP won't help as my PC and laptop aren't work fine. Run out of ideas now. The auto connection doesn't work at all. The manual insertion of IP's allows me to connect to the modem but no futher. I then get a DNS error message , contact ISP. All rather frustrating, i only bought it for the for SMART TV capability.
Any suggestions before i send it back. Any firmware updates to address this. I see only one for the UE46ES6100 on the website , is it worth trying?