There are as many possibilities as there are when trying to find a needle in the haystack. The first think to look for is the WiFi is in range. How o you do the Internet on TV, cable, Wireless or... I don't know unless you spend little more time next time you write a problem on FixYa. You first need to explain whether it is cable connection to the TV, which is a bit impossible, unless your smart TV has wireless connections. Other things that you need to check is the wireless range seen on the TV (those tiny bar-graphs usually seen at the bottom right of the screen), are they all active? They're usually 5 little vertical bars. If the Wireless is fine, you can be sure you will have the Internet, no matter what. If it is not loading you have to reset the code to match the wireless signal of your ISP. Better still, your TV is really a modern one, since it is a Smart TV and it comes with a Manual you cannot fail to understand. Read it carefully under the 'Wireless Connection' section and you cannot go wrong. Panicking over nothing doesn't get you anywhere closer to a solution to your problem. Like computers, Smart TV requires an Internet Service Provider (ISP) and a Wireless Modem to start with. Do you still feel confused? Then try this link below. It may help you... http://www.knowhow.com/article.dhtml?articleReference=1246&country=uk
...or, lastly, contact Hitachi.