If you have a Lcd TV on the wall and you want to watch netflix, youtube, hulu, go to facebook, or check weather watch live news online, but you dont wanna spend $200 buy a xbox or PS3. There is the best solution for how to make a Lcd TV as Smart TV, first you need have a old PC can't be too old i think best is XP or higher and make sure PC powers on and re-install the new OS, there is many ways to do it, download the ISO use usb drive make a boot drive you can find it on YouTube, burn a dvd and use Dcaemon Tools(Software can open ISO. after you install new OS
1. you need update the Video card you can buy one on amazon between $30 - $50 that is good price of video card of media use and make sure the video card have a HDIM output.
2. you need buy a HDIM cable from amazon is only $5, after you install the Video card use a HDIM cable connect TV and PC set up right input.
3. you need buy a wireless keyboard and mouse $20- $50 is good price to get one
turn on your TV and PC, change TV to the right input  connect wireless keyboard and mouse to PC go to browser and open netflix.com, now you Lcd TV is a Smart TV.