Google Pixel 4a Fingerprint Replacement Guide

A faulty fingerprint sensor can prevent the Google Pixel 4a from recognizing fingerprints correctly or using fingerprint unlocking as expected. Replacing the fingerprint sensor requires opening the phone, removing the LCD screen and internal frame components, replacing the faulty fingerprint part, and then reassembling the device.

In this guide, we’ll cover how to open the Google Pixel 4a, remove the LCD screen, take out the mid frame plate and board bracket, replace the faulty fingerprint sensor, and complete the reassembly.

Repair Information

Repair Information	Details
Device	Google Pixel 4a
Repair Type	Fingerprint Sensor Replacement
Repair Difficulty	★★★★☆
Estimated Time	Approximately 1–2 hours

Reasons for the Repair

You may need to replace the Google Pixel 4a fingerprint sensor if you experience:

• Fingerprint recognition problems
• The fingerprint sensor not responding
• Fingerprint unlocking not working correctly
• A damaged fingerprint sensor
• Problems registering or using fingerprints

Important: Work carefully when opening the Google Pixel 4a. Avoid excessive force around the LCD, connectors, and internal components.

Before You Begin

Compatibility and Model Numbers

This repair guide based on Google Pixel 4A

Model Numbers | G025J, GA02099, G025N

Tools Required

• Mobile phone heating pad or hairdryer/heat gun
• Plastic pry tool / card pry
• Suction cups
• Torx T3 screwdriver
• Torx T4 screwdriver
• Torx T5 screwdriver
• Tweezers (for connectors)
• B7000 glue or double-sided adhesive (for back cover)
• Rubber bands or bonding clips to secure the back cover

How to Find Tools and Parts

• Heat Mat / Heating Pad – https://amzn.to/3H0tHzJ
• Best Portable Heat Gun – https://amzn.to/4cZYnhL
• Clamps – https://amzn.to/3GYJT4w
• STREBITO 142 Piece Repair Tool Kit – https://amzn.to/3UO1jUx
• Stronger Suction Cup – https://amzn.to/3UVb6YR
• Silicone Work Repair Mat – https://amzn.to/4euW6fs
• Must Have Glue | Adhesive – https://amzn.to/4uxhKog
• Compatible Parts –
  • Battery – https://amzn.to/3HVIKuZ
  • Screen – https://amzn.to/4nx0iwF
  • Other Parts – https://amzn.to/4gp2mEC

Step 1: Open the Google Pixel 4a

Begin by opening the Google Pixel 4a to access the internal components.

The LCD screen needs to be removed before the internal frame and fingerprint sensor can be accessed.

---

Step 2: Remove the LCD Screen

Gently heat around the edges of the LCD screen to soften the adhesive securing it to the phone.

A heating pad can be used to warm the display. Alternatively, a heat gun or hairdryer can be used carefully.

Once the adhesive has softened, use a suction cup to lift the screen slightly.

Insert a plastic card pry tool into the opening and carefully separate the adhesive around the display.

Work slowly and avoid inserting the pry tool too deeply, as internal components and the display flex connection can be damaged.

Once the adhesive has been released, carefully lift the LCD screen away from the phone.

---

Step 3: Remove the Mid Frame Plate

With the LCD screen removed, the mid frame plate can be accessed.

Carefully remove the mid frame plate from the phone to expose the components underneath.

Keep any removed screws organized so they can be returned to their original locations during reassembly.

---

Step 4: Remove the Board Bracket

Next, remove the board bracket.

Carefully release the bracket from the phone and set it aside.

Removing the bracket provides access to the faulty fingerprint sensor and allows it to be removed from the device.

---

Step 5: Remove the Faulty Fingerprint Sensor

Locate the non-working Google Pixel 4a fingerprint sensor.

Carefully remove the faulty fingerprint sensor from the phone.

Work gently during this step to avoid damaging the surrounding components or the fingerprint connection.

---

Step 6: Install the New Fingerprint Sensor

Take the replacement Google Pixel 4a fingerprint sensor and position it correctly.

Secure the new fingerprint sensor in its proper location.

Make sure it is positioned correctly before continuing with the reassembly.

---

Step 7: Reinstall the Board Bracket

Place the board bracket back into position.

Secure the bracket and make sure it is properly aligned with the surrounding components.

---

Step 8: Reinstall the Housing and Mid Frame Plate

Next, place the housing and mid frame plate back into position.

Make sure the frame components are properly aligned before continuing with the LCD installation.

Secure the required components in their original positions.

---

Step 9: Reinstall the LCD Screen

Before securing the LCD screen, make sure the display and phone frame are properly aligned.

Carefully place the LCD screen back onto the phone.

Apply gentle pressure around the display edges so the screen sits securely against the phone body.

If adhesive needs to be replaced, use suitable LCD adhesive to secure the display.

---

Step 10: Close the Phone and Install the Back Cover

Once the LCD screen has been installed, complete the final phone assembly.

Make sure the screen is firmly secured and properly aligned.

Complete the back cover installation and allow any display adhesive enough time to set before returning the phone to normal use.

---

End of Repair Guide

The Google Pixel 4a fingerprint sensor replacement is now complete. Once the phone has been fully reassembled, verify that the fingerprint sensor responds correctly and that fingerprint unlocking functions as expected.

---

FAQ

What components need to be removed to access the Pixel 4a fingerprint sensor?

The repair sequence includes removing the LCD screen, mid frame plate, and board bracket before replacing the fingerprint sensor.

Do I need to remove the LCD screen?

Yes. The LCD screen is removed at the beginning of the repair to provide access to the internal components.

Can I reuse the existing mid frame plate?

The procedure includes removing and reinstalling the existing mid frame plate.

Should I test the fingerprint sensor after replacement?

Yes. After completing the reassembly, verify that the replacement fingerprint sensor responds correctly and that fingerprint unlocking works properly.

What should I check before installing the LCD screen?

Make sure the housing and mid frame plate are properly positioned and the internal components are correctly aligned before reinstalling the LCD.

---

Troubleshooting

What if the fingerprint sensor does not respond after replacement?

Check that the replacement fingerprint sensor is correctly positioned and that its connection is properly secured before completing the final assembly.

What if the LCD screen does not sit correctly?

Check the alignment of the housing and mid frame plate before pressing the LCD into place. Make sure the screen is positioned correctly against the phone body.

What if the phone does not work correctly after reassembly?

Review the components and connections handled during the repair and make sure everything has been properly reinstalled before completing the final assembly.

What if the fingerprint unlocking still does not work?

Verify the fingerprint sensor installation and then test fingerprint recognition again after the phone has been fully reassembled.

---

Related

More Pixel 4a Repair Guides

Check Pixel 4a 5G Repair Guides

How to replace Pixel 5 Battery