Does unplugging a television from the wall socket make it safer?
If the power button on your TV is a hard button (like the I/O button at the back of your PC case), it should completely cut the power lines from your TV set. It's just like that you unplugged your cable! But if your TV power button is a soft button, (like a push button) then the ac-dc converter of you TV is working and the controller circuit inside is on and working (but of-course the LCD row/column IC drivers are off). the TV is consuming some power but as long as there is no disturbance in your home AC power, there is no harm on the electronics circuit inside your TV set!
My home TV has a soft button, and I myself unplug the cable when I'm away traveling for a few days! :)