OK here's how.
1) Connect PS3 via composite or scart adaptor so you can see the screen, picture quality poor but there you go - i.e. set sw to AV2, source as dvd2 and no HD - you simply want the ps3 image and access to the menus.
2) Choose DISPLAY SETTINGS on the PS3 menu
3) Choose Output medium as Component
4) Says SCREEN WILL GO BLANK FOR 30 SECS ETC - PRESS X to begin
5) Best thing to do is have the Component leads already connected to the BV7, usually on AV4 and sw settings to PC or V.MEM
6)Presss X
7) disconnect the lead from composite/scart adaptor at ps3 end and put in component lead end (into PS3)
8) Press V.MEM or PC on BEO4 (whichever you chose to identify ps3 by)
9) Press X on PS3
Clear as mud? But it works........................... all this from an £8000+ set, but after you've done this you'll be over the moon.