I'm not sure about the other one, but: >Do modern TVs need high voltage circuits unless they're plasmas? The way a lot of power supplies work, is that they re

I'm not sure about the other one, but: >Do modern TVs need high voltage circuits unless they're plasmas? The way a lot of power supplies work, is that they rectify the 110V/230V to a reasonably high DC value, and change that to a high frequency AC signal so it can be transformed to a lower voltage with a smaller transformer. This means there's typically some capacitors charged with sqrt(2) * line voltage during normal operation.