i'm trying to calibrate my fmx touchscreen. its off by about 3/4" or so. i've tried going through the minor display calibration and it keeps telling me it failed because it is to far off. I've also held the lower brightness button on the back while powering up and it brings me to the same screen calibration and still fails. is there a different way of doing the major calibration? I'm running v5.01 (i believe).