I just got Dish network (DVR 625) a couple days ago and I am trying to get the IR remote to work with my TV. It will control the volume and the power, but will not operate the TV/Video button. The TV is a Philips-Magnavox (TP3681C1) that I purchased in 1999. I have tried using all the different codes in the back of the users manual for Philips and Magnavox. Any suggestions short of buying a new TV?