I believe the 10A is the new(cheaper) replacement. It seems to be missing many of the options on the non 10A model. At least with the 20" model. Oh and on the 20" model, there is no NON 10A better model available. I think Vizio is cheeping out. My Insignia LCD also has no black light adjustments either.
Under advanced video settings go to the DCR and turn it off and that should bring up the backlight adjustment. I have a different model of Vizio TV but that's how I got mine to come up. With DCR on the backlight adjustment is turned off. Hope that helps!
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