Can anyone tell me how to turn off the key lock? I accidentally switched it on and don’t know which buttons to press to turn it off again. Also I don’t have a working manual right now. Whenever I am watching a DVD I have no idea how to change the language etc, how to move through the menu. Whenever I press the arrow buttons the tv switches back on to tv. Is there a combination for it? Or is it simply not possible to use that tv without manual?Please help!!