You're having network issue on your iPhone 7 and this isn't because of the antenna ? Maybe it's the grounding pin which is damaged ! Experts at SOSav will tell you how to fix it with out repair guide which comes with pictures and comments !
Before disassembling the grounding pin of your iPhone 7, you have to securely turn it off.
Maintain the power button on the top for a few seconds.
Then slide to the right to "power off" button in red.
Your iPhone 7 is now turned off.
With a pentalobe screwdriver, remove the two screws circled in red.
Those screws are on both sides of the dock connector.
Those two screws hold the bottom part of the display assembly to the iPhone.
With a hairdryer, heat up the edge of the iPhone' screen as shown in red on picture 2.
This consists in peeling the seal between the screen and the rear panel.
Then put the suction cups as near as possible to the home button.
Pull the cup enough to let a gap appear.
Put an opening pick between the display and rear case.
Take a second opening pick and slide it around between the display and rear case.
Start again on the right side.
Careful when sliding the pick because the screen connection cable are on this side.
You can now open the iPhone by swinging the display up from the left side, like opening a book !
The lower connector bracket is now removed.
Use a nylon spudger to disconnect the display connector .
Then unlock the second display connector.
With a cruciform screwdriver, remove the two screws that maintain the front panel sensor assembly connector bracket.
Remove the bracket with tweezers.
The bracket is now removed.
Disconnect the proximity/front camera cable.
The complete display assembly is now removed from the iPhone 7.
Disconnect the battery by lifting the connector from the logic board.
Use the cruciform screwdriver again and remove the 5 screws.
They are circled in red on the picture.
Use a pair of tweezers to remove the plastic bracket.
Remove the grounding pin screw with the cruciform screwdriver.
With a pair of tweezers, remove the grounding pin.
The grounding pin of your iPhone 7 is now disassembled.
You can replace it by a new one.
To reassemble your iPhone 7 follow this guide in reverse order.
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