This TV can't understand a laptop signal directly (for most laptops - there are some computers that have a TV out option). The EWL20D6 has S-video, component and composite video inputs. Your best picture will be to get a VGA (RGB) to Component Video (YPbPr) converter with a 3.5 mm to RCA L/R audio cable. See this page for some idea of the available converters: http://www.ramelectronics.net/audio-video/video-converters/vga-rgb-hv-to-component-video/c10000-c11200-c11215-p1.html
. The VGA to component video cable is meant for projectors that can interpret the RGB signal, not TVs.
If your laptop has an HDMI port, you will need a different type of converter.
Once you have the correct hardware, you will need to make sure that the external video port is active on your laptop. For some machines, you may need to enable this in the BIOS first (press Esc, F1, F2 or F10 (depending on the computer) on bootup to get to the BIOS - it may take a few tries to time it correctly). Then turn off the TV and computer before connecting the cables. Then turn on the TV and set it to the desired input before turning on the laptop. Then set the laptop to send the video signal to the external monitor. (On my Win7 laptop, I right-click on the Desktop and select Graphic Properties. Then set the desired display (laptop screen, external monitor, both) and click Apply. Then press OK when you see the confirmation box on the now active screen.)
The Emerson EWL20D6 was manufactured by Funai for the Emerson line. Thus the manual is available here: http://www.funai-corp.com/support/manuals.aspx
. Manuals are listed in alphabetical order. (If you use the search function, leave off the brand name.) The direct link to the manual is: http://www.funai-corp.com/6pdf/om/EWL20D6.pdf
I hope this helps.