The rig I made to raise and lower my Sony TV (X90C) from inside the roof.
It's driven by a garage door motor, supported by steel cables, and directed by drawer slides (3 sets attached to eachother to get the extension). The counter weight balances the weight of the TV to reduce the load on the motor (it was struggling without it).
Since uploading this I also added a flap (with foam for insulation) which closes over the hole when the TV is in the down position. I also plan to add a box enclosure up in the ceiling to help keep it sealed and cooler when in the ceiling. Though on really hot summer days I might just keep the TV down.
The garage door motor is a Chambelain HandyLift Plus. This worked well because it has programmable stop limits (which it remembers even if it looses power). It also has a learning over-torque function which will stop the motor if the torque is higher than normal (I.e. if the TV gets jammed or hits something on the way down). This motor comes with it's own remotes. The TV will automatically stop in the up or down position or you can press the button again to stop it at any position.
The drawer slides are 125kg rated x 500mm. With three sets together I could get 1.5m extension compressing down to 500mm. I needed this much compression because of how it is mounted to the TV and the limited space in the ceiling. If I had mounted all the way down the TV I could have used 2 sets of 750mm slides to get the same extension (this would have been more rigid). I got the slides from here http://www.indrub.com.au/hardware/drawer-slides/125kg-non-locking/125kg-drawer-slide-side-mounting-non-locking.html
I used stainless steel wire rope (2.0mm with 7x7 strands) for the cables. This is rated at 254kg per wire. I also used turnbuckles to give some fine adjustment of each wire. http://stores.ebay.com.au/lowcostwire/
I used 90mm plastic pulleys (designed for gym equipment) mounted to a 10mm shaft, stiffed by some 50x50x4 angle welded to the shaft with cutaways for the pulleys. You can get these off ebay.
I was able to get the cable real (plastic) for from an electrical supplier near me. I also mounted deep grove ball bearings in the cable real to take up the difference in diameter to the shaft.
Video used on the TV is here https://www.youtube.com/watch?v=iNJdPyoqt8U
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