Unplug the TV and the HD receiver before you make any connection:
Connect the Component '(Y, Pb, Pr)' Video Out jacks from the HD receiver (or similar to device) to the 'HD INPUT' jack on the bottom/back/side of the TV.
Connect the red and white Audio cables to the audio (left and right) output jacks on the rear of the HD receiver to the 'AUDIO IN (PC/HD)' jack at the bottom of the TV.
Turn the TV and the HD receiver ON.
Press the 'HD' mode button to set the TV into the HD mode and tune to the HD signal.