Introduction
Use this guide to remove the fingerprint sensor in the Motorola Moto E4 Plus (XT1771).
Before you begin, download the Rescue and Smart Assistant app to backup your device and diagnose whether your problem is software or hardware related.
Before disassembling your phone, discharge the battery below 25%. The battery can catch fire and/or explode if accidentally punctured, but the chances of that happening are much lower if discharged.
In order to replace the fingerprint sensor you’ll need to remove the display first.
You’ll need replacement adhesive to reattach components during reassembly.
What you need
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Insert the edge of the spudger into the notch on the bottom right corner of the phone.
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Twist the spudger to start releasing the back cover from the phone.
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Slide the spudger along the bottom edge to separate the back cover from the phone.
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Remove the eighteen 3.3 mm Phillips screws securing the midframe assembly.
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Insert an opening pick underneath the bottom left corner of the motherboard cover.
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Slide the opening pick between the cover and the second SIM tray to release the plastic clip.
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Insert an opening pick underneath the bottom right corner of the motherboard cover.
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Use the opening pick to pry up the motherboard cover.
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Use the edge of a spudger to pry up and disconnect the battery flex cable from the motherboard.
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Tool used on this step:Tweezers$4.99
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Use the edge of a spudger to pry up the flap of the ZIF connector located below the SIM slot on the left side of the motherboard.
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Use a pair of tweezers to pull the power and volume button flex cable out of the ZIF connector.
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Use the flat end of a spudger to pry up and disconnect the interconnect flex cable.
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Use the tip of a spudger or an opening pick to pry up the flap of the ZIF connector, located in the bottom right corner of the motherboard.
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Use a pair of tweezers to pull the display flex cable out of the ZIF connector.
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Grasp the motherboard by the top corners and remove it by lifting up and pulling it carefully out of its recess.
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Remove the single 2.9 mm Phillips screw holding the charging board to the frame.
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Tool used on this step:Tweezers$4.99
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Use a pair of tweezers to pry up and disconnect the antenna cable.
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Use the edge of a spudger to pry up and disconnect the interconnect flex cable.
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Use the edge of a spudger to pry up and disconnect the fingerprint sensor flex cable.
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Insert the tip of a spudger underneath the bottom edge of the charging board and pry upwards.
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Remove the charging board.
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Tool used on this step:Tweezers$4.99
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Use a pair of tweezers to peel the copper tape from the right edge until the display flex cable underneath is fully exposed.
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Use a pair of tweezers to carefully peel the display flex cable off of the midframe.
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Prepare an iOpener and apply it to the display for at least two minutes to loosen the adhesive underneath.
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Once the screen is warm to the touch, apply a suction cup near the top edge of the phone right under the earpiece speaker.
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Pull up the suction cup, and insert the tip of an opening pick under the display where the earpiece speaker is located.
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Slide the opening pick to the top left corner of the phone to cut the adhesive.
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Insert a second opening pick and slide it to the top right corner of the phone.
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Slide the opening pick from the top right corner down the right edge of the phone and cut the adhesive with it.
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Slide the opening pick around the bottom right corner.
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Slide the opening pick along the bottom edge of the phone and cut the adhesive.
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Repeat the previous heating and cutting procedure on the left edge of the phone to cut the remaining adhesive.
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Carefully thread the display cable at the top and the fingerprint sensor cable on the bottom through their gaps in the midframe.
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Remove the LCD and digitizer.
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Apply an iOpener to the bottom edge of the screen for about a minute to loosen the adhesive beneath the fingerprint sensor.
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Tool used on this step:Tweezers$4.99
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Carefully pry off the fingerprint sensor by lifting it with the edge of an opening pick.
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Remove the fingerprint sensor with a pair of tweezers.
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The best way to secure the new screen is with a sheet of custom-cut double-sided tape. Apply the tape to the back of the screen, then carefully feed the display cable through the frame. Align the screen and press it into place.
To reassemble your device, follow these instructions in reverse order and reapply adhesive where it’s necessary.
If possible, turn on your phone and test your repair before installing new adhesive and resealing the phone.
Take your e-waste to an R2 or e-Stewards certified recycler.
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