Problem with TV Zoom, please help!

I have a panasonic PT47X64 CRT rear projection. My picture is zoomed in and cannot be adjusted. I went through convergence and couldnt fix it. I also went through the aspect ratio options, no luck.
I also have the same problem with other inputs, so I dont think its the cable.
There is also a zoom function but i cannot access it.
sombody please help, or point me in the right direction.