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There are several things that can cause inverted luminance....Setting contrast and or AGC too high is one of them. Try minimizing contrast is that still does not fix it note the AGC setting and then try backing it down till the video un-inverts...If you loose signal before then, it indicates there are other problems and in that case it may be worth wile to return AGC to it's previous setting. Personally I would avoid monkeying with it until you have a decent modulator set up.
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