Quote:
Originally Posted by g-sani
I am asking this WM6 thinking of the AC mains.
May be we detect this as well when the set is on. 
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AC mains voltage remain too in TV after turn TV OFF, but this voltage is not so high as voltage at CRTs High Voltage Anode made in form of shielding. This voltage remain long after turn TV OFF. This is explanation why you can sense CRT after turn TV OFF.