Since we know that faulty DNS settings lead to the issue of Samsung TV won't connect to WiFi, so to refresh DNS settings: From the Menu option on the remote, go to the Settings. Here, Select Network > Network Settings > Start > IP settings > DNS Mode and make sure that Manual mode is on Green check and press OK.A) Press Home button from the TV remote then select Menu. B) Select settings. C) Select All Settings on TV screen. D) Select Support option from the TV remote. E) Select Device Care, then select Self Diagnosis option. F) Select Sound Test from the TV remote. G) After selecting the Sound Test, check whether sound is coming proper or not, if Yes FJuU.