I would try turning the ASC feature off and changing the audio mode with the Dolby Pro Logic II button on your remote. I know if its in "Stereo" mode the rears will not work. After you find a setting you like you can turn the ASC back on.
Rear speakers of my Samsung Home Cinema system arent playing..While doing the Auto Sound Calibration test they are shown working with the sound test. Please help with a sloution..