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The light bulb/Fan trick basically raises the temp high enough to reduce condensate from forming on surfaces inside the TV. Another approach would be to place a tray of silica gel or drierite (CaSO4) inside the set for a day or so.
I'm 5 miles for the Ocean in San Diego. Even at this distance I'm careful about exposed high voltage anodes outside when the humidity > 60%. Of course, warm humid days and cool nights often leaves the air saturated causing dew to form on cooler surfaces - hence the possibility of arcing.
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