I have a brand new Dell 15r and got it to use on an older TV w/ RGB hook up and unfortunately it did not work properly. It could be due to the fact it's a new computer and is intended for older ones, but not matter what I tried to do to fix the problem nothing worked. Hope this is helpful.
I tried this cord with my Samsung HGTV and my father's Panasonic TV with my Dell laptop. I also tried this with my home PC to my Samsung HGTV and it didn't work. I tried connecting the ports on the back of the TV's as mentioned, but no picture ever displayed.