I just picked up a 60PB5600 on Black Friday and was dissapointed with the initial black levels coming from an S64 Panasonic. I remembered this LG tweak from my previous 50" plasma and it worked great there so I was excited to get started.
Took all the screws off the back only to find that the base of the unit is actually holding onto the back panel as well. Can't get it off without unscrewing the base. Before I could do anything about that the front bezel flipped forward and the pane of glass off the front tumbled to the ground along with 3 of the internal mounting frames. Not sure of the 6600 is built the same way but I recommend proceeding with caution. Took me awhile to figure out how to put it all back together again, especially by myself. I was worried of getting dust/dirt inside the glass so I used a microfiber cloth. Got almost all of it but I can see a little bit still stuck in there when I get close on a full color slide.... sad.
So what am I to do now? I haven't done any of the tweaks still. I'm thinking of putting the plasma face down, removing the base and all the back panel screws, then lightly putting the base and most of the panel screws back in to keep the TV together a little bit - due to the tweaks/ test and then reverse the process.