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There is high voltage inside a TV set to launch the electrons through the CRT with enough velocity to cause the phosphor coating to light up. There is also a high voltage for the steering coils to cause the electron beam to curve to allow it to hit the top and bottom rows of the set and to scan across each row.

I assume TVs don't have a ground pin because they likely have an isolation amplifier inside them which would separate the TV set from the household power. This would prevent noise from the household power from recking the tv signal. I'm not sure though. The reason that Air Conditioners, irons, and refrigerators would not, is because noise travelling to those devices is typically not as big a problem so an isolation transformer wouldn't be necessary.

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