I have a old 21" LG Sampoorna TV I would like to connect my laptop to it? Has any one done it earlier if so guide me how to do

If your TV has RCA or S-Video input jacks, you can purchase a VGA to RCA converter

Here is one, you can find more through Google
VGA to RCA Converter S-video (http://www.abccables.com/vga-rca-svideo.html)