I managed to install a 6 inch deep LCD TV behind a 4 inch gap between main wall and drywall. I took apart a functional LCD TV panel (THOMSON model 42M71NH20 42 inches wide) and placed it behind drywall. Here is how I did it.
Step 1: Dissasembly
Every LCD TV is different and you need some prior experience with taking apart and putting them back together agian. I've fixed at least 5 laptops and several monitors, so I knew what I was doing. I carefully took the unit apart. I did not use force. When something did not immediatly disconnect I tried looking on-line and attempting to take that particular part again in a different manner.
Step 2: Testing If the Unit Is Still Operational
After I took all the insides of my LCD out, I connected all wires back to where they were originally connected and powered up the unit without the casing. I lay the LCD panel and tuner with power supply on the floor and turned it on. I was very happy to see the unit operational. I could now bring the parts to my appartment and start assembling the LCD behind drywall.
Step 3: Assembly
I attached the unit to metal drywall beams.
Step 4: Testing Functionality Again
After I fastened the unit to drywall beams I turned it on again to see If it all works fine.
Step 5: Setup Complete
And finally my setup is complete.