Hello Patrick,
I suppose you have free the Decoder scart. Then, you need to send out composite video from Decoder scart to the projector. When you select AV-DVD, AV-TV, AV-video source... the Avant screen will turn off, but will send the video to projector. I have a similar setup and it's great.
The Beo5 is excellent for this.
My setup:
BV3:
- AV = BC2
- V.Tape = V.Mem = HDR2 with Nokia 110T
- Decoder = Connected a scart switch = Macbook and Playstation 3. From the scart switch go out a video composite to projector.
- Camcorder = Apple Dock for ipod.
- Coax 1 = BC2
- Coax 2 = Playstation 3 throught adaptor
Surround sound: BL8000+BL2+BL3
Projector Panasonic AX200
- Composite Video = recive the BV3 video (TV, HDR2, BC2,..)
- HDMI 1 = Playstation 3.
Beo5 = To control Light (3 LC2), Projector Screen (1LC2+rele), and Panasonic projector. The xml to control the Panasonic projector and Apple remote is available in the download site of Beoworld.
One button turn on the Beoliving: Light, Screen, AV-BV3, Projector,... Great!
I hope my setup can help you and gives you some idea.