Hi, I'm Nathan.Sorry to hear that you're having trouble with this but I'll do my best to help you.
What is the make/model of the tv?
When you go into the wifi setup, did it see your wifi network name? Did it accept the password?
Okay something is missing however, if it connects to the wifi, then you should at least get the local network connection properly. Internet may require some other settings,
are you sure it says local access fail still?If so, please unplug power to both the router and the tv. Wait a few minutes, plug router back in first, wait a minute (enough time to walk back upstairs) and plug the tv in and reconnect to test again.
Does it show an IP address in the network info?
The mac will not be the same, which is normal.
Go into the dns, and manually change it to 126.96.36.199 and let me know if that helps
that gateway will not work, and even the ip address is way off, it is not properly connecting to your router. Are you using some type of range extender or booster?
It is not providing a valid ip or gateway to the tv, and that coupled with the computer issues you had points to this being a faulty router
You can try updating the router firmware, but beyond that the router will likely need to be replaced, as that is the failure point here, not the tv.
A faulty router can still work with some devices, or have intermittent connections, but everything here points to a router fault. If it was working properly, the tv would be pulling a correct IP address, gateway, and DNS from it.
You can try taking the tv downstairs (or running a cord up) and physically plugging it into the router with an ethernet cable, even just temporarily, to see if it will connect and update that way, then test the wifi again after.
Okay, after you do that if you get stuck or need more help, just let me know and I'll be happy to guide you through.
If you need some router recommendations I can advise on that as well.
Just checking in, were you able to replace the router, or do you need any more help?