Sony KV-2643R composite injection

[freakaftr8]

Hey all so I have this Trinitron KV-2643R that I just brought back from the bowels of the deep and installed a A67JHG01X from a roach infested tabletop. Dialed in and looks good but I'm interested in injecting composite or even better svideo into the chroma/luma pins at the jungle. It's a Sony CX-556 IC. Have no specs on it. Or a sams on the set. I've done many RGB mods on trinnys and others of the such, but usually have a schematic to help me out. Any ideas?

Thanks!