To disassemble the iPhone 8 you need the following tools:
• Screwdriver set • Tweezers and opening plastic tool
• Plastic mediator • Suction cup for removing display
In the description of this video, I left links to the necessary tools and parts for replacement.
Before disassembling, turn off the iPhone and remove the sim card tray.
Unscrew two screws near the lightning port.
Display glued around perimeter of iPhone and we need to heat the surface of iPhone for
open it.
Apply the suction cup near to the “home” button and pull up on the ring.
Next, push the plastic mediator between the display and iPhone case.
From this position, evenly and slowly, open the display around the perimeter of
the phone.
The iPhone case opens like a book, open the display to the right.
Next, using a Phillips PH00 screwdriver, unscrew the 4 screws and remove the metal panel.
First, disconnect the battery cable from the mainboard.
After that, remove the 2 display cables.
Next, unscrew the 3 screws and remove the metal panel in the upper case of the iPhone.
Disconnect the front camera cable from the mainboard.
Unscrew the 3 screws and remove the metal panel.
Next, unscrew the 2 screws and remove the speaker.
Lift the light sensor out of its housing and separating adhesive holding camera and sensor
cable.
Remove the front camera and sensor cable.
Remove the old glue from the iPhone case.
Also, remove the adhesive from the display module.
After that, wipe the surface of iPhone case and display module.
Now take adhesive tape and apply to the case of the iPhone.
With this tape, you save waterproof resistance of the iPhone.
Also, I left link to this adhesive tape in description.
Connect two display cables and front camera cable to the mainboard of iPhone 8
Install the metal panels and fasten the screws.
Now close the iPhone 8 case ... and press down the display around the perimeter.
Fasten the two screws near the lightning port.
Now you can turn on the iPhone 8 and use it.