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I've done it with just a black screen - like you sometimes get with a modulator with nothing hooked to the input, or a DVD player turned on, but with no disc in it -- The black will look a little too red, green, or blue depending on which is set too high. With this method you can set the controls too low though, so you want to start with the controls a little high, then turn them down till just when the black screen stops looking too red, green or blue, but no lower.
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