the TV will be alright if you switch it on and off a few times using the main switch (you must use the mains switch !!), leaving maybe 10 or 15 minutes between switch on. Or, if there is an option in the menu's, try degaussing it manually a few times. Failing that, you will have to try a degaussing wand or coil at a tv repair shop. but its not permanent damage !
Owen.