noodles!
i tried the same thing one year ago, and get the same results!
the fresnel on OHP is doublet, it is two fresnels glued together, so you cant use it for this. try to put ordinary page magnifier with bumpy side towards the tv screen instead of OHP fresnel, combined with OHP magnifier (the one from OHP's arm)!
the reason you are getting pale image is that OHP magnifying lens has small diameter, so there is not enough light passing through it! try to move tv closer to the wall, you will get smaller, but brighter image!
or use the lens from opaque projector, it is basicaly the same as OHP lens, only much bigger, and it will give you much brighter image!