I have the European Model the TX-p50st50E.
And wen I set my PS3 to RGB Full over HDMI my TV does not change to Full range 0-255 mode, showing darker image and crushed blacks. It should change to the correct range automatically.
The European model doesn't have the HDMI Range menu to select manually it only has the DVI input settings that only appear wen I connect the PC with an DVI-HDMI cable our adapter, then i can select normal or Full, wen i select Full the TV goes to 0-255 mode and the image looks great.
His their any way I can trick the TV to switch to 0-255 range our is their a service menu option that lets you select the default HDMI Range.