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Probably that varies from one manufacturer to another; it should be somewhere in the range of 50-100 watts. There should be a sticker on the back of your monitor that tells the electrical specifications, including how much watts it uses. If the sticker doesn't mention watts, it should mention volts and amperes. In this case, if you multiply volts x amperes, you get watts.

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Q: How many watts used in a 19 inch lcd monitor?
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