The wood frame actually slides down after you remove the screws on either side inside the cabinets to the left and right, and the screws in the plastic cover under TV. And the drop cloth over the vents is avery good idea!

When you get the wood frame off you will find a pretty rugged metal frame assembly up there. I took my TV out just to tighten things up, tie up wires that were vibrating on plastic cover etc. I was impressed with how it was done. I'm going to keep the 2004 sony as long as the picture is so good. Would love to know how you make out with this project.