I have two NEC displays (A PA271 and an older LCD2690WUXi). I use the NEC MDSVSensor to calibrate both. I am using the same calibration targets (D65, Gamma 2.2, 120 cd/m2) for both. The problem is that after (multiple) calibration(s), the 2690 displays colors significantly differently from the PA271. The difference, as far as I can determine, is primarily a higher saturation and intensity in the RED channel. The display does not have a red tint - it is just that the reds are more "candy apple" while the PA271 is more "blood red". I have eye-balled both units displaying an image of the X-Rite Color Checker Passport against the real thing and the PA271 is spot on. Repeated re-calibrations of both units result in the same results. This has been the case since I bought the PA271. I feel like I'm wearing two watches.
The PA271 has 2404 hrs and the 2690 has 13197 hrs. I use 52-step calibration. The puck is plugged into the USB port on the PA271.
I was hoping that someone might have a clue as to what could be causing these differences. What could I be doing wrong? Driving me nuts.