Xiaomi Redmi Note 9 Fingerprint Sensor Replacement Repair Guide

Difficulty

Moderate

Steps

Time Required

                          30 - 35 minutes

Sections

SIM Card Tray
1 step
Back Cover
7 steps
Fingerprint Sensor
6 steps

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Introduction

Before you begin this procedure, be sure to have a set of replacement adhesives for both the back cover and the fingerprint reader.

What you need

Step 1

              Eject the SIM card tray

Insert a SIM card eject tool, a SIM eject bit, or a straightened paper clip into the hole on the SIM tray located at the left edge of the phone.
Press directly into the hole to eject the SIM card tray.
Remove the SIM card tray.

Insert a SIM card eject tool, a SIM eject bit, or a straightened paper clip into the hole on the SIM tray located at the left edge of the phone.

Press directly into the hole to eject the SIM card tray.

Remove the SIM card tray.

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Step 2

              Heat the back cover

The back cover of the Redmi Note 9 is held in place by plastic clips and adhesive. It might require some force to release the plastic clips.
Prepare an iOpener and apply it to the back cover for at least two minutes to loosen the adhesive underneath.
A hair dryer, heat gun, or hot plate may also be used, but be careful not to overheat the phone—the display and internal battery are both susceptible to heat damage.

The back cover of the Redmi Note 9 is held in place by plastic clips and adhesive. It might require some force to release the plastic clips.

Prepare an iOpener and apply it to the back cover for at least two minutes to loosen the adhesive underneath.

A hair dryer, heat gun, or hot plate may also be used, but be careful not to overheat the phone—the display and internal battery are both susceptible to heat damage.

Step 3

              Insert an opening pick

Secure a suction handle to the bottom edge of the screen, as close to the edge as possible.
If the screen is cracked, the suction handle may not stick. Try lifting it with strong tape, or superglue the suction handle in place and allow it to cure so you can proceed.
Lift the screen and phone assembly with the suction handle to create a small gap between the assembly and the back cover.
In case you have trouble creating a gap, apply more heat to further soften the adhesive. Follow the iOpener instructions to avoid overheating.
Insert an opening pick in a steep angle into the gap you created. This might require some force.
Slide the opening pick to the bottom right corner to slice the adhesive and release the plastic clips holding the back cover in place.

Secure a suction handle to the bottom edge of the screen, as close to the edge as possible.

If the screen is cracked, the suction handle may not stick. Try lifting it with strong tape, or superglue the suction handle in place and allow it to cure so you can proceed.

Lift the screen and phone assembly with the suction handle to create a small gap between the assembly and the back cover.

In case you have trouble creating a gap, apply more heat to further soften the adhesive. Follow the iOpener instructions to avoid overheating.

Insert an opening pick in a steep angle into the gap you created. This might require some force.

Slide the opening pick to the bottom right corner to slice the adhesive and release the plastic clips holding the back cover in place.

Step 4

              Release the plastic clips and slice the adhesive

Insert a second opening pick in a steep angle at the bottom edge of your phone.
Slide the opening pick to the bottom left corner to release the plastic clips and to slice the adhesive.
Leave the opening picks in place to prevent the adhesive from resealing.

Insert a second opening pick in a steep angle at the bottom edge of your phone.

Slide the opening pick to the bottom left corner to release the plastic clips and to slice the adhesive.

Leave the opening picks in place to prevent the adhesive from resealing.

Step 5

              Release the plastic clips and slice the adhesive

If the adhesive becomes hard to cut, it has most likely cooled down. Use your iOpener to reheat it.
Slide the bottom left opening pick along the left edge of your phone to release the plastic clips and slice the adhesive.
Leave the opening pick in the top left corner to prevent the adhesive from resealing.

If the adhesive becomes hard to cut, it has most likely cooled down. Use your iOpener to reheat it.

Slide the bottom left opening pick along the left edge of your phone to release the plastic clips and slice the adhesive.

Leave the opening pick in the top left corner to prevent the adhesive from resealing.

Step 6

Slide the bottom right opening pick along the right edge of your phone to release the plastic clips and slice the adhesive.
Leave the opening pick in the top right corner to prevent the adhesive from resealing.
Do not try to separate the phone assembly from the back cover all the way yet, the fingerprint reader is still adhered to the back cover.

Slide the bottom right opening pick along the right edge of your phone to release the plastic clips and slice the adhesive.

Leave the opening pick in the top right corner to prevent the adhesive from resealing.

Do not try to separate the phone assembly from the back cover all the way yet, the fingerprint reader is still adhered to the back cover.

Step 7

              Heat the fingerprint reader

Prepare an iOpener and apply it to the back cover where the fingerprint reader is located for at least two minutes to loosen the adhesive underneath.

Prepare an iOpener and apply it to the back cover where the fingerprint reader is located for at least two minutes to loosen the adhesive underneath.

Step 8

              Remove the back cover

Carefully lift the back cover upwards whilst pressing down the fingerprint reader with a finger.
The fingerprint reader should separate from the back cover during this procedure. In case the adhesive is too strong, you can reapply a heated iOpener to the fingerprint reader for one to two minutes to further loosen its adhesive.
Remove the back cover.
Secure a new back cover with pre-cut adhesive or double-sided adhesive tape. Apply the new adhesive into the back cover and not onto the frame of the phone assembly. After installing the back cover, apply strong, steady pressure to your phone for several minutes to help the adhesive form a good bond—a stack of heavy books works well.

Carefully lift the back cover upwards whilst pressing down the fingerprint reader with a finger.

The fingerprint reader should separate from the back cover during this procedure. In case the adhesive is too strong, you can reapply a heated iOpener to the fingerprint reader for one to two minutes to further loosen its adhesive.

Remove the back cover.

Secure a new back cover with pre-cut adhesive or double-sided adhesive tape. Apply the new adhesive into the back cover and not onto the frame of the phone assembly. After installing the back cover, apply strong, steady pressure to your phone for several minutes to help the adhesive form a good bond—a stack of heavy books works well.

Step 9

              Loosen the fingerprint sensor

The fingerprint sensor is held in place by mild adhesive.
Slide the tip of an opening pick underneath the fingerprint sensor and pry it up to separate it from the motherboard cover.

The fingerprint sensor is held in place by mild adhesive.

Slide the tip of an opening pick underneath the fingerprint sensor and pry it up to separate it from the motherboard cover.

Step 10

              Unfasten the motherboard cover screws

Use a Phillips screwdriver to remove the eleven 3.9 mm-long screws securing the motherboard cover.

Use a Phillips screwdriver to remove the eleven 3.9 mm-long screws securing the motherboard cover.

Step 11

              Pry up the motherboard cover

Insert the tip of an opening pick underneath the bottom left edge of the motherboard cover.
Pry up the motherboard cover.

Insert the tip of an opening pick underneath the bottom left edge of the motherboard cover.

Pry up the motherboard cover.

Step 12

              Remove the motherboard cover

Carefully remove the motherboard cover.
Take care not to strain the finger print cable during this procedure. In the meantime the fingerprint sensor might adhered to the motherboard cover again and needs to be loosed before removing the cover.

Carefully remove the motherboard cover.

Take care not to strain the finger print cable during this procedure. In the meantime the fingerprint sensor might adhered to the motherboard cover again and needs to be loosed before removing the cover.

Step 13

              Disconnect the fingerprint cable

Use a spudger to disconnect the fingerprint cable by prying the connector straight up from its socket.

Use a spudger to disconnect the fingerprint cable by prying the connector straight up from its socket.

Step 14

              Remove the fingerprint sensor

Remove the fingerprint sensor.
During reassembly apply new adhesive where it’s necessary after cleaning the relevant areas with isopropyl alcohol (>90%).

Remove the fingerprint sensor.

During reassembly apply new adhesive where it’s necessary after cleaning the relevant areas with isopropyl alcohol (>90%).

Compare your new replacement part to the original part. You may need to transfer remaining components or remove adhesive backings from the new part before you install it.

To reassemble your device, follow these instructions in reverse order.

Take your e-waste to an R2 or e-Stewards certified recycler.

Repair didn’t go as planned? Try some basic troubleshooting, or ask our Answers community for help.

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Introduction#

What you need#

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Introduction

What you need

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