I had trouble with my set up, sound and no picture. But resloved this by buying a scart adapter/converter. which has rca for left/right speaker and video along side a s-video socket. Mine is made by jvc and brought at curries or comet @ £10 but I think places like maplins do them cheaper.
My cabling goes; two rca's for left/right audio with a 3.5 jack at the other end which connects to the line in on t.v card. I also have an s-video cable connected as well.
I'm assuming that you have a full copy of neo which includes neroexpress. If you use neroexpress then you can set it to make a dvd, and it should regconise the t.v card as a capture card, you well need the video on and it can take a little bit of massing to locate the correct channel. But once there you can either capture straight away or you can set a pretimed recording.
Neroexpress is basicaly an authoring software, but it does write straight to file, so there is no need to carry out a complete authoring if you don't want to, the file still will be there waiting.