I have an old 32" Vizio that has been connect to TWC cable box for years. Now I want to move it to just a plane coax drop from TWC. When I connect the coax to the DTV port (plug and play) on the Vizio it goes blank. I think I have a bad DTV port. So, I am wondering if I can somehow take the coax drop and convert it to HDMI. I hope that the HDMI port is working. Has anyone performed this task? And if so, how did they do it.