Normally never need additionally degaussing the CRT, because the TV have own circuit to handle these problem. Unfortunately since TV-s is remote-controlled this circuit work only when firstly plug into the wall-socket,because the PTC and degaussing coil connected before the switching circuit. Try unplug from wall-socket - as bogdanfirst wrote - for 30 min. , this time enough for PTC to cooling and plug in. For strongly magnetized CRT repeat this procedure 4-5 times. If this method no help, the PTC is damaged, change it. (low cost)