There is no "back again".
When you do this, you set a menu item on the LT150 to "component input". Then, as I understand it, the pj synchs on G (instead of H & V with RGB). I assumed Chele would use the breakout cable (comp to mini 15) that came with the pj (at least it did with my 150z). Works fine - you can use 4:3 & 16:9. Hope that clears it up. HNick