Some Sony TVs take a few seconds to warm up before the picture appears. This is true not only of Sony but other brands as well. The components inside the TV are responsible for this delay.
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Many older TVs, including Sonys, are made with glass vacuum tubes. A vacuum tube is the picture tube that allows the TV to display images.
The Heating Element
Vacuum tubes only work after they heat up. A heating element, such as a copper filament wire, is built into the TV. After the TV's power is turned on, it takes a certain amount of time for the heating element to warm the vacuum tube. There will be a small wait, measured in seconds, before the picture appears.
Plasma and LCD TVs
Modern plasma and liquid crystal display (LCD) TVs do not use vacuum tube technology to create a picture. These TVs work differently and typically take less time to warm up.
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