Reviews, reviews, reviews...

Question: unable to get pic in pic

I recently bought a new sony 46ex710, mainly for the pic in pic feature. I had this feature on my previous set of 10 years, also a Sony. p-i-p is the main reason I bought this set. I find out I cannot use this feature, even tho it is one of the features you advertise. Or, maybe I should say no one knows how to make the correct cable/box connections. I'm using comcast xfinity, and comcast has no idea how to make the proper connections. I like p-I-p, as I like to, for instance) watch a sport ( YEA,BEARS), ON CHANNEL 6 AND A STORY ON CHANNEL 9, AND SWAP AS NECESSARY. So that's my dilemma. Can soneone please help me????THANKS