I have a BD-P1500 and an Onkyo TX-SR705 and am not experiencing your problem. I am using one of the HDMI inputs on the receiver and the HDMI out to my Samsung 52A650. Are you running the most current firmware on your BD-1500? If not haven't updated it, I would start there first. I'm assuming that you have tried using the same HDMI input and cable on a different device to confirm that you can pass audio and video. Have you checked on the Onkyo website for any firmware updates for your TX-SR606 or you might contact Onkyo at 800-229-1687, they might be able to talk you through a setting on your receiver.
I have a new BD-P1500 blue ray and a new Onkyo SR 606 receiver. The HDMI video will not pass through the receiver. HDMI audio from blue ray will play from the receiver. So the only way I can get video is to run HDMI directly to TV video input and use optical cable from blue ray to receiver for home theater audio. I've been told that I'm losing out on audio quality by not using the hdmi cable to DVD input on receiver. The hdmi port on receiver is not defective as I successfully passed through hdmi video and audio to TV from Phillips hdmi DVD.
I called samsung and was told that there is a compatibility problem between samsung and onkyo. Has anyone else had this problem? I have not seen it posted and its hard to believe there are not more people with samsung blue ray and onkyo receivers having this compatibility problem.