How to factory reset a philips 42" lcd tv?

I need to return a tv that is poor quality screen and too big than dimensions advertised. Apparently i cant if ive switched it on!! I want to factory reset it, the only thing i did was adjust the picture quality setting preference and i tried a ps3 on it and my sky plus box...how do i reset it so it i s like brand... show more I need to return a tv that is poor quality screen and too big than dimensions advertised. Apparently i cant if ive switched it on!! I want to factory reset it, the only thing i did was adjust the picture quality setting preference and i tried a ps3 on it and my sky plus box...how do i reset it so it i s like brand new? It is brand new condition with all cellophane still on it. thanks
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