Unable to adjust brightness, nor color level?

I have an (Orion television set, Model # STV2763). I do not have the original remote to this set and I am unable to make any adjustments to my screen brightness levels or the color levels with any other remotes that I know of. Certainly not any of the ones i've purchased. Any help here please!? It is a nice set all in all, but the screen is much too often, too dark, and the colors are often a bit too briliant.