Sony tv KDL-50W800B not turning on

@gopikanth if you are sure you have power to the TV then it is time to check things out. First measure the output of your power supply. It should measure 19.5V. After that unplug your set and remove the back. Take a look at all the board. Check for any obvious damage like domed looking, leaking capacitors, as well as other components. Post a couple of images of your boards with your question so we can see what you see. Use this guide iFixitでの質問に画像を追加する方法 for that. You need a multimeter to check the main board and see if you have power going to it. First thing you want to do is to check the fuse(s) on the power board for continuity. I marked those with a red arrow.

After that use the flowchart for your TV

Let us know (see) what you find.