how to check if iPhone Display is original or third party / fake

Third-Party Display Modification
Illuminate display with an LED flashlight. If reflection on display has color bands or refractive color banding as shown on the left, then it is an original Apple display. The banding will not be present on a device that has this type of third-party display. Note: If display powers on, then this test is not necessary.

originalthird party

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