The hairline crack is the most common type of crack. Hairline crackscan quickly turn into bigger problems if they’re not dealt with properly. First thing you should do is evaluate the damage. If the crack is longer than an inch or if it’s starting to spread, you’ll need to take action to prevent further damage.

Since your screen is made up of pixels, a black spot is most likely because some pixels in a specific area have failed to work. These dead pixels can be due to a defect in the phone, physical damage, or issues with the battery. In most cases, it’s impossible to fix the dead pixels on your screen by yourself. 

(1) iPhone is having memory problems. eg:  If  is running under insufficient storage. (2)  If covered with water for long.(3) Something wrong with your iPhone software. (4)Hardware-related problems.

Whether the black screen issue began before or after login, you should first try to restart the computer. Sometimes all it takes is a simple reboot to get the system back on track. If you can’t restart the computer the in this way. Try to access the power button by pressing Ctrl + Alt + Delete

(1) Loose connection of flex cable: An intense rollercoaster ride, or just jumping from a high place to a lower surface might cause your flex cable to become hardly connected. (2) Water and other moisture: If your kid wets your iPhone with saliva all day long, that purple lines or tints will begin to develop on its screen. (3) Dropping your iphone on a hard surface: Mistakenly drop it on a hard surface, e.g., concrete, tiles. (4) Systems errors: Such as an update to iOS 16. Older generation iPhones are more susceptible to this issue.

A dead pixel occurs when the transistor that powers it fails to supply power, causing it to remain permanently black, never illuminating. The most common cause of dead pixels is a manufacturing defect. Undetectably small errors in assembly can result in a handful of dead pixels among the million of functional ones

Backlight bleed is characterized as light leaking around the edges or corners of an LCD. This is due to the way these displays work; they use a light behind the panel that faces the display. Backlight bleeding is simply some of the backlight leaking through.