How do I connect my Pioneer LaserDisc player to my TV that only has a Coaxial Input? It only has S-Video outputs.

how 'bout using a cable converter ?

Hmm thats not gonna be to difficult I found a schemtaic for you. If it is what I think and you have S-Video out put from your Laser disc and Coaxial input to your Television you can build it your self for about ~$3 I could check radio shack price lists if you want. here's the schematic for the signal combiner and seporator. so either way you have it here:

basically you can combine the seperated signals from the s-video with a capacitor. Or with an LC network. Try it out. No guarantees though as I have nothing that uses s-video to test it on.

Heres the page I got the info from:
http://www.sbe.org/~sbe26/newsletters/200112.pdf

If you want to use the LC network and cant quit see all the components all redraw the schematic for you.

http://www.hut.fi/Misc/Electronics/circuits/svideo2cvideo.html
one more link very simple circuit.