If I may stick my nose in here, I think it is your TV input and not the 990. I have the same issue with my Samsung DLP. 2 or 3 of the component inputs are for signals in HD (480p, 720p and 1080i) and one is for 480p and below (480i) only. I believe the transcoding of the 990 simply routes the 480i signal of S video & composite to component out on the 990, and does NOT upconvert it to 480p.

The onscreen display only works through component video on one input on my TV...the one designed to handle 480i signals. Plugged into the other ones I get the message "Not Supported Mode" This is somewhat of a catch-22 because all the HD signals need to be in one of the other component inputs if I want resolution of 720p that my TV is native to. Hence, I must run the onscreen display through S video and change the input to view the OSD. Now, all that being said. If the 990 is indeed suppposed to upconvert to 480p (I don't think so)...then there is a problem somewhere in the 990.