I tried to connect a Xcard from sigma designs to the component input of my loewe aventos. The Xcard is a pc mpeg decoder card. All I get is a "no signal" message on the tv I use the correct cable. I checked this. There is a signal comming from the xcard with a solid sync pulse on Y. I checked this with a scope The av3 scart is set to YUV with sync on Y any options ?