How to Color Correct the Yellow Screen of iPhone 7 or iPhone 7 Plus
On the device with the yellow tinted or unusually warm display, do the following:
Step 1. Open the “Settings” app and go to “General” and then to “Accessibility”.
Step 2. Tap on “Display Accommodations” and then tap on “Color Filters”.
Step 3. Flip the “Color Filters” setting to the ON position.
Step 4. Select the “Color Tint” option from the filter list.
Step 5. Now adjust the Hue to be less yellow by sliding the Hue bar, move it around until your screen is closer to the color hue you are looking for.
Step 6. Slide the “Intensity” filter to a low setting to offer a more subtle color correction.