If it's anything like the 3803 then you can only get the onscreen display from either the s-video or composite inputs. There must be something in the manual about this.

2xM80 VP180 2xQS8 2xM3 HSU STF3 LG 60PS11 Denon 3808 ATI 1506 LCR 2xATI 1502 Oppo BDP-83