Samsung Galaxy M31 Back Cover Fingerprint Sensor Replacement Repair Guide

Difficulty

Moderate

Steps

9

Time Required

                          20 - 30 minutes            

Sections

2

• Samsung Galaxy M31 Back Cover Removal
• 6 steps
• Back Cover & Fingerprint Sensor
• 3 steps

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Introduction

You’ll need replacement adhesive to reattach the fingerprint sensor when reassembling the device.

What you need

Step 1

              Remove 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 side of the phone.
• Press firmly to eject the 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 side of the phone.

Press firmly to eject the tray.

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Step 2

• Insert an opening pick between the phone assembly and the back cover at the bottom edge of the phone.
• Slide the opening pick around the bottom right corner to release the clips holding the back cover in place.

Insert an opening pick between the phone assembly and the back cover at the bottom edge of the phone.

Slide the opening pick around the bottom right corner to release the clips holding the back cover in place.

Step 3

• Insert a second opening pick between back cover and the phone assembly at the bottom edge of the phone.
• Slide the opening pick around the bottom left corner to release the plastic clips holding the back cover in place.

Insert a second opening pick between back cover and the phone assembly at the bottom edge of the phone.

Slide the opening pick around the bottom left corner to release the plastic clips holding the back cover in place.

Step 4

• Slide the opening pick along the left side of the phone to release the plastic clips on the left side of the back cover.

Slide the opening pick along the left side of the phone to release the plastic clips on the left side of the back cover.

Step 5

• Slide the opening pick along the right side of the phone to release the plastic clips on the right side of the back cover.

Slide the opening pick along the right side of the phone to release the plastic clips on the right side of the back cover.

Step 6

              Remove Back Cover               

• The flex cable of the fingerprint sensor is very short and the sensor is likely to disconnect itself during the following removal procedure. Avoid damaging the cable by removing the back cover too quickly.
• Carefully lift the phone assembly out of the back cover.
• During reassembly, this is a good point to power on your phone and test all functions before reinstalling the back cover. Be sure to power your phone back down completely before you continue working.

The flex cable of the fingerprint sensor is very short and the sensor is likely to disconnect itself during the following removal procedure. Avoid damaging the cable by removing the back cover too quickly.

Carefully lift the phone assembly out of the back cover.

During reassembly, this is a good point to power on your phone and test all functions before reinstalling the back cover. Be sure to power your phone back down completely before you continue working.

Step 7

              Soften Fingerprint Adhesive               

• Apply a heated iOpener to the back of the phone where the fingerprint sensor is located to loosen the adhesive underneath. Apply the iOpener for at least two minutes.

Apply a heated iOpener to the back of the phone where the fingerprint sensor is located to loosen the adhesive underneath. Apply the iOpener for at least two minutes.

Step 8

• Slide an opening pick underneath the edge of the fingerprint reader.
• Slide the opening pick around the edge of the fingerprint reader to cut the adhesive underneath.

Slide an opening pick underneath the edge of the fingerprint reader.

Slide the opening pick around the edge of the fingerprint reader to cut the adhesive underneath.

Step 9

              Remove Fingerprint Sensor               

• Remove the fingerprint reader.

Remove the fingerprint reader.

To reassemble your device, follow these instructions in reverse order. Apply new adhesive where necessary after cleaning the relevant areas with isopropyl alcohol (>90%).

Secure the fingerprint sensor with pre-cut adhesive or double-sided adhesive tape during reassembly.

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

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Author

                    Dominik Schnabelrauch                     

Member since: 11/23/2016

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legga001 - Dec 27, 2020

Reply

What type of adhesive is best to use to stick the back cover back on. Glue or tape?