Okay, so I've done all the google'ing I can handle. I've got an old DIY Prismaik setup on my LG tv. I saw that with my tv rooted I could run Hyperion on it directly and not have to use my pc anymore, I'd love that. Did some digging and got Hyperion.NG and PicCap installed, and read somewhere that I need a RPi to drive the LEDs.
So what I can't figure out is how to send the signal from Hyperion on the TV to the Pi, or am I going about this all wrong?