All iPhone models (including the earliest ones) are initially designed to adapt to various lighting conditions, which is done via a special ambient light sensor situated near the phone’s speaker. Going from a dark room into a brightly lit one may cause the iPhone to stay dim until the screen is unlocked. Sometimes, though, this simple trick doesn’t solve the problem—and may sometimes even reset the phone entirely.
iPhone screen repair centres around Melbourne have likely dealt with this issue on several occasions, and they can give a few explanations why. Most of the time, the problem is caused by the iPhone’s brightness setting or the special “auto-brightness feature” described in the previous paragraph. For the worst-case scenario, something may have gone awry within the phone’s screen itself, though screen failures aren’t necessarily that bad—the issue might be caused by a single, failing component inside.