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This is the speaker used to listen while phone is held up to your ear.
Remove the two screws securing the upper component bracket:
4.0 mm Phillips #000
2.3 mm Phillips #000
It is imperative that the right screws are inserted into their respective holes. Otherwise it may cause severe damage to the LCD during reassembly.
Orient the phone as shown, with the home button on top and the earpiece speaker on bottom.
Gently dislodge the clip, near the bottom left corner of the earpiece speaker bracket, outwards from its recess on the front panel assembly.
Do not pry with excessive force, as the earpiece speaker bracket is fragile and malleable.
With a set of tweezers, shift the bracket to the left to unclip it.
Remove the bracket from the display.
Remove the earpiece speaker with a set of tweezers.
If you use your fingers, be very careful not to touch the gold contacts on the front panel. Finger oil can prevent good contact.
To replace the earpiece speaker, it is easiest to install the speaker and bracket together:
Place the earpiece speaker bracket over the speaker so that it fits snugly in its housing.
Slide the left hook of the bracket into the notch above the top left corner of the front facing camera.
Rotate the bracket so it lays flat on the rear case, aligning the two screw holes. Press the bracket into place, ensuring the hook on the right side of the metal bracket latches onto the display.