Just to update you all:
Without selecting AV1-3 I can see the test pattern.
Running the “display” command I see that the test pattern is HDMI IN RGB 24Bit 720×480.
The Input source on the Xbox is set to AV2 (Component cables )
the ossc shows 525i , 15. 73Khz 59.94hz
I assume i need 480P / I out not the 525 PAL ?