![]() However, very often this problem is caused not by the failure of the backlight itself, but by the related “backlight circuit” that powers and controls it. If this backlight fails, your screen will be very dark and only be visible under strong light. At the front, a filter layer adds colour, but it’s the backlight shining from behind that makes your phone’s screen light up. The LCD panel itself sits in the middle, but on its own this is just an unlit black-and-white display (think of a higher resolution version of the old-style LCDs used in digital watches or early Nintendo GameBoys). If your Apple iPhone or Apple iPad is having problems with a dim screen, it’s almost certain that the fault is related to the backlight.
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