Why would cutting power to an LCD cause any damage? It's the same as cutting power via the power button.
I own a Xenarc 700TSV and I was wondering if a hard shutoff of the screen would damage it or would not be good for it. I'm planning on taking the cigarette lighter power cable and cutting it then wiring it to the ignition wire on the harness. That way once I turn the key, the monitor will be powered and when I take the key out, the power is cut off.
My screen is powered by the 12V supply in the computer. That way it goes on and off with the pc. It also is guaranteed smooth regulated power.