checking over my notes when i built a scart to bnc cable, i used Red (15), Green (11), Blue (7), and Video Out / Sync (19). now i also used R G B Sync grounds (13, 9, 5, 17) individually because of BNC's style of plug, but you could probably get away with using Common ground (21) on your DB9. I would also recommend using a male/femal scart extension, cutting off the male and and making the cable into an adapter. I don't have a 1080 monitor so I'm sorry I can't help more.