wow no TV model stated, wow ! model NUMBER.
the #1 top question about computers (besides dead ) is
wifi dead, everybody uses it and it loves to fail or run slow.
wifi is a SHARED resource that you do not own. ok?
you are just user of the radio channel, shared, switch to channel 5 yet ? at the router but I digress.
The TV must be close to the router not 50feet away. ok?>
buy a AP access point wired bridge> (ask) put it near TV ?
first off use wired Ethernet
, see it works and everyday forward no PAIN.
if you must use WIFI learn to test it first. ok?
learn your credentials too. first. SSID and PW.
on a PC at home try wifi now, or on any smart cell phone
turn on wifi and turn off say 3G, does wifi work now?
if yes, then wifi is OK, testing wifi done.
now back to that TV (no model stated at all,sticker on rear words)
The TV can (most smart TVs) have a reset networking feature
RTM read the manual yet, id read it to you but no TV stated.
all do really, reset it and then it goes in to wifi setup
it asks you 2 things, really, just 2,
your SSID, that is your home wifi router name used in the PC or smart phone tests above.
my TV and all PCs show like 10 homes near by there SSID
and mine, , mine is (lie) FIDO123. so on my TV I see FIDO123.
and click that, now it asks for my password passphase,
mine is written down and is COMPLEX. (security max here)
I type that and like magic the wifi works , if not is it to far from your router , is it? TV >>>>>router???? distance is what? walls? of concrete are bad. for wifi. (dense walls bad of any kind)
Wifi is problematic for sure 801 b or g and n (geT "AC" if TV allows this) The best TVs are set up for. 801.11-/ac" features.
Wifi can run slow, or 1/2 speed if one other errant device in home causes N bonding drop out, making TV show buffering delays.
here is LG TV that does "AC"wifi spec.
LG 55" Class 4K (2160P) Ultra HD Smart LED HDR TV 55UK6090PUA
I your router is "AC"rated the pair work very good.
TVs 2013 and newer have this now for 6 years.