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Difficulty

Moderate

Steps

20

Time Required

                          30 - 45 minutes

Sections

4

  • SIM Card
  • 2 steps
  • Back Cover
  • 13 steps
  • Battery Disconnection
  • 1 step
  • Battery
  • 4 steps

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1

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  • BackXiaomi Redmi Note 9T

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Introduction

For your safety, discharge the battery below 25% before disassembling your phone. This reduces the risk of fire if the battery is accidentally damaged during the repair. If your battery is swollen, take appropriate precautions.

You’ll need replacement adhesive in order to complete this repair.

What you need

Step 1

              Eject the SIM card tray
  • Insert a SIM card eject tool into the small hole in the SIM card tray, located on the upper left edge edge of the phone.
  • Press firmly to eject the tray.

Insert a SIM card eject tool into the small hole in the SIM card tray, located on the upper left edge edge of the phone.

Press firmly to eject the tray.

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Step 2

              Remove the SIM card tray
  • Remove the SIM card tray from the phone.
  • When reinserting the SIM card, make sure it’s in the proper orientation inside the tray.
  • A thin rubber gasket around the SIM tray provides water and dust protection. If this gasket is damaged or missing, replace the gasket or the entire SIM tray to protect your phone’s internal components.

Remove the SIM card tray from the phone.

When reinserting the SIM card, make sure it’s in the proper orientation inside the tray.

A thin rubber gasket around the SIM tray provides water and dust protection. If this gasket is damaged or missing, replace the gasket or the entire SIM tray to protect your phone’s internal components.

Step 3

              Insert an opening pick
  • The back cover of the Redmi Note 9T is held in place by plastic clips and mild adhesive around the camera cut-out. It might require some force to release the plastic clips.
  • Insert an opening pick in a steep angle between the display assembly and the back cover where the charging port is located. This might require some force.
  • Make sure to insert the opening pick between the back cover and the display frame to avoid separating the screen from the frame.

The back cover of the Redmi Note 9T is held in place by plastic clips and mild adhesive around the camera cut-out. It might require some force to release the plastic clips.

Insert an opening pick in a steep angle between the display assembly and the back cover where the charging port is located. This might require some force.

Make sure to insert the opening pick between the back cover and the display frame to avoid separating the screen from the frame.

Step 4

              Release the bottom edge plastic clips
  • Slide the opening pick to the bottom right corner to release the plastic clips holding the back cover in place.
  • Leave the opening pick in the bottom right corner to prevent the clips from snapping back into place.

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

Leave the opening pick in the bottom right corner to prevent the clips from snapping back into place.

Step 5

  • 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.
  • Leave the opening pick in the bottom left corner to prevent the clips from snapping back into place.

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.

Leave the opening pick in the bottom left corner to prevent the clips from snapping back into place.

Step 6

              Release the left edge plastic clips
  • Slide the bottom left opening pick along the left edge of your phone to release the plastic clips.
  • Leave the opening pick in the top left corner to prevent the clips from snapping back into place.

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

Leave the opening pick in the top left corner to prevent the clips from snapping back into place.

Step 7

              Release the right edge plastic clips
  • Slide the bottom right opening pick along the right edge of your phone to release the plastic clips.
  • Leave the opening pick in the top right corner to prevent the clips from snapping back into place.

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

Leave the opening pick in the top right corner to prevent the clips from snapping back into place.

Step 8

              Release the top edge plastic clips
  • Slide the left opening pick around the top left corner to release the top edge plastic clips.

Slide the left opening pick around the top left corner to release the top edge plastic clips.

Step 9

  • Slide the right opening pick around the top right corner to release the remaining plastic clips.
  • Don’t try to separate the phone assembly from the back cover all the way yet – the power and volume button cable is still connected to the motherboard.

Slide the right opening pick around the top right corner to release the remaining plastic clips.

Don’t try to separate the phone assembly from the back cover all the way yet – the power and volume button cable is still connected to the motherboard.

Step 10

              Open the phone assembly
  • Carefully fold the back cover to the left side of the phone assembly like you would open the cover of a book.
  • Take care not to strain or tear the power or volume button flex cable during this procedure.
  • During reassembly align the back cover with the phone assembly and snap it back in its original position.

Carefully fold the back cover to the left side of the phone assembly like you would open the cover of a book.

Take care not to strain or tear the power or volume button flex cable during this procedure.

During reassembly align the back cover with the phone assembly and snap it back in its original position.

Step 11

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

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

Step 12

              Pry up the motherboard cover
  • Insert an opening pick underneath the bottom right edge of the motherboard cover.
  • Slide the opening pick along the right edge of the motherboard cover to release its plastic clips.
  • Twist the opening pick sideways to pry up the motherboard cover.

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

Slide the opening pick along the right edge of the motherboard cover to release its plastic clips.

Twist the opening pick sideways to pry up the motherboard cover.

Step 13

              Remove the motherboard cover
  • Remove the motherboard cover.

Remove the motherboard cover.

Step 14

              Disconnect the home and volume button cable
  • Use a spudger to disconnect the home and volume button cable by prying the connector straight up from its socket.
  • To re-attach press connectors like this one, carefully align and press down on one side until it clicks into place, then repeat on the other side. Don’t press down on the middle. If the connector is misaligned, the pins can bend, causing permanent damage.

Use a spudger to disconnect the home and volume button cable by prying the connector straight up from its socket.

To re-attach press connectors like this one, carefully align and press down on one side until it clicks into place, then repeat on the other side. Don’t press down on the middle. If the connector is misaligned, the pins can bend, causing permanent damage.

Step 15

              Remove the back cover
  • Separate the back cover from the phone assembly.

Separate the back cover from the phone assembly.

Step 16

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

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

Step 17

              Peel off the battery pull-tabs
  • Take care not to puncture or bend the battery with your tool—a punctured or bent battery may leak dangerous chemicals or cause a fire.
  • Use a pair of blunt nose tweezers or a clean fingernail to peel the orange adhesive strip labeled with an A off the battery.

Take care not to puncture or bend the battery with your tool—a punctured or bent battery may leak dangerous chemicals or cause a fire.

Use a pair of blunt nose tweezers or a clean fingernail to peel the orange adhesive strip labeled with an A off the battery.

Step 18

  • Repeat the previous pull-tab procedure on the orange adhesive strip labeled with a B.

Repeat the previous pull-tab procedure on the orange adhesive strip labeled with a B.

Step 19

              Lift the battery
  • Grab both pull-tab ends labeled with an A and pull up on the adhesive strip to lift the battery out of its recess and swing it up to an upright position.
  • If you’re having trouble lifting the battery out of its recess, apply a heated iOpener to the screen for two minutes to loosen the battery adhesive.
  • A hair dryer, heat gun, or hot plate may also be used, but be careful not to overheat the device.
  • Don’t point a heat gun directly onto the battery but only onto the screen to prevent the battery from overheating.

Grab both pull-tab ends labeled with an A and pull up on the adhesive strip to lift the battery out of its recess and swing it up to an upright position.

If you’re having trouble lifting the battery out of its recess, apply a heated iOpener to the screen for two minutes to loosen the battery adhesive.

A hair dryer, heat gun, or hot plate may also be used, but be careful not to overheat the device.

Don’t point a heat gun directly onto the battery but only onto the screen to prevent the battery from overheating.

Step 20

              Remove the battery
  • Peel the battery off the remaining adhesive.
  • Remove the battery.
  • Don’t reinstall a damaged or deformed battery, as doing so is a potential safety hazard.
  • Secure the new battery with pre-cut adhesive or double-sided adhesive tape. In order to position it correctly, apply the new adhesive into the device at the places where the old adhesive was located, not directly onto the battery. Press the new battery firmly into place.
  • During reassembly, temporarily reconnect the battery to the motherboard before you press it into place to ensure correct alignment. Disconnect the battery after it’s seated.

Peel the battery off the remaining adhesive.

Remove the battery.

Don’t reinstall a damaged or deformed battery, as doing so is a potential safety hazard.

Secure the new battery with pre-cut adhesive or double-sided adhesive tape. In order to position it correctly, apply the new adhesive into the device at the places where the old adhesive was located, not directly onto the battery. Press the new battery firmly into place.

During reassembly, temporarily reconnect the battery to the motherboard before you press it into place to ensure correct alignment. Disconnect the battery after it’s seated.

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.

For optimal performance, calibrate your newly installed battery after completing this guide.

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 Xiaomi Redmi Note 9T answers community for help.

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                    Dominik Schnabelrauch

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