I want to reiterate, this unit has a bad GP
I failed to look at the back of the unit, but when you mentioned s/video it jogged my mind. On the back it has HDTV/ATSC and UHF/VHF. Boat these inputs are Coaxial.
It also has A/V imput, This input looks like a headphone jack. Svideo, Infrared transmitter out, SVIDEO, S400, and Optical out Still did not see the 15 pin plug.
I know if you have bad gpu in a computer you can connect to another computer and get a screen. What I don't know if it is possible with this unit