The Nokia Lumia 930 has a display problem. The Lumia 930 has a 5′ Full HD AMOLED display and Windows Phone 8.1 operating system. The display issue is related with a problem called purple tint where the display shows a light purple color on white and black backgrounds.
A problem like this shouldn’t be present on a high-end device like the Nokia Lumia 930. The good thing is that the purple tint issue is not a problem with the display. The problem is with the bad calibration Microsoft has done to the device.
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And like every other software problem, the purple tint problem on the Nokia Lumia 930 can easily be fixed by changing a few options on the settings menu.
To fix the purple issue on the Nokia Lumia 930, go to Settings > Display -> Adjust Color Profile. There are a few options like neutral, purple and green. You have to move the slider to green in order to remove the purple tint.
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Now, whenever your Lumia 930 displays a black or white display, it will be black and white and the tint issue will be gone.