Fixed my Wifi problem with below method :
I have been facing same issue. My Samsung TV connects to Wifi but no internet. It connects fine with mobile hotspot but Wifi it is was not working.
I try all solutions of changing DNS settings, restart of TV, restart router, reset smart hub but nothing worked.
Finally i tried below option and it worked like charm.
I have d-link router
1. Login to router with admin credentials
2. Navigate to wifi and advanced options
3. Mac filtering option
4. Enable Mac filter - Change "Mac Filter restrict mode" to Deny 5. Connect samsung tv again to wifi. It should connect to internet now
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