Very dark image on external big screen

Hi. I've got my 15"MBP attached to a Samsung 40" via miniDV out to VGA. Picture on the big screen is a lot darker than the Computer screen. Settings on the TV don't improve it. Also pretty dim when going through data projectors as well all on VGA. Any thoughts anyone. I had thought about the frequency settings on the display preferences.

Welcome to Apple Support Communities
Did you try re-calibrating the external to increase the brightness, or select another profile ?

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