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I had the same thing happen to mine. A momentary power outage rendered the TV lift non-functioning. First, remove the center speaker cover above the TV and find the control box for the lift. IF the TV works ok, you know you have power to the lift controller. If it does't, check breakers. etc to locate the cause. Since you didn't mention it, I assume the TV works ok. The controller has three connections that come from the multiplex system. Try disconnecting the three leads, keeping track of which goes to each terminal. The center is a common and one side is the up terminal and the other is the down terminal. With a jumper, screwdriver or paper clip, jumper between the center screw and one side, and then the other. If the TV lift operates, you have a multiplex problem. You should hear a relay click when making contact. If that doesn't work, you may have a bad controller. Also be advised, there is a manual "crank" that lets you raise or lower the lift by hand. It has a clutch that is engaged by pulling the shaft out. Note, with the shaft out and the clutch engaged, the electric lift is disabled, so make sure you have the manual shaft pushed in fully. It should turn freely and nothing should happen when it is disabled.
I purchased a new controler from the Lift Manufacturer, located near Bellingham, WA for about $250. Let me know if you can't find them and I will try to locate them. Unfortunately, my coach is halfway accross the country right now, so I don't have access to a lot of the information.
Joe Van Loan