Aller au contenu principal

Introduction

Follow this guide to replace the motherboard on a Google Pixel 4a.

The unreinforced display panel on the Pixel 4a is fragile. Pay special attention to the warnings in the opening procedure if you are reusing the screen.

  1. Insert a SIM eject tool, bit, or straightened paper clip into the SIM tray hole. Press directly into the hole to eject the SIM card tray. Remove the SIM card tray.
    • Insert a SIM eject tool, bit, or straightened paper clip into the SIM tray hole.

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

    • Remove the SIM card tray.

  2. You will need to pry the screen up to remove it from the phone. Read the following notes carefully before proceeding. Take note of the two seams on the edge of the phone: Screen seam: This seam separates the screen from the rest of the phone. This is where you should pry.
    • You will need to pry the screen up to remove it from the phone. Read the following notes carefully before proceeding.

    • Take note of the two seams on the edge of the phone:

    • Screen seam: This seam separates the screen from the rest of the phone. This is where you should pry.

    • Frame seam: This is where the plastic frame meets the back cover. It is held in place by screws. Do not pry at this seam.

    • Before you begin, note the following areas on the screen:

    • Screen flex cable: Do not insert the opening pick deeper than instructed or you risk damaging this cable.

    • Adhesive perimeter: Prying beyond this narrow perimeter without angling the pick will damage the OLED panel.

  3. Apply a heated iOpener to the right edge of the display for one minute to soften the adhesive.
    • Apply a heated iOpener to the right edge of the display for one minute to soften the adhesive.

    • 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.

  4. If your display is badly cracked, covering it with a layer of clear packing tape may allow the suction cup to adhere. Alternatively, very strong tape may be used instead of the suction cup. If all else fails, you can superglue the suction cup to the broken screen. Place a suction cup as close to the right edge of the screen as possible. Lift the suction cup with a strong steady force.
    • If your display is badly cracked, covering it with a layer of clear packing tape may allow the suction cup to adhere. Alternatively, very strong tape may be used instead of the suction cup. If all else fails, you can superglue the suction cup to the broken screen.

    • Place a suction cup as close to the right edge of the screen as possible.

    • Lift the suction cup with a strong steady force.

    • Insert the tip of an opening pick into the screen seam no more than 1 mm.

  5. This step shows how to insert the pick without damaging the OLED panel. Do this before beginning to slice the adhesive. With the pick 1 mm into the gap, pivot the pick upwards to a steep angle. At a steep angle, carefully push the pick into the gap about 1/4 inch (6 mm). The pick should slide in below the OLED panel.
    • This step shows how to insert the pick without damaging the OLED panel. Do this before beginning to slice the adhesive.

    • With the pick 1 mm into the gap, pivot the pick upwards to a steep angle.

    • At a steep angle, carefully push the pick into the gap about 1/4 inch (6 mm). The pick should slide in below the OLED panel.

    • Stop if you feel the point of the pick hitting a ridge. The pick may be pressing against the edge of the OLED panel. Angle the pick and try again.

  6. Slide the pick along the right edge of the screen to cut the adhesive. Do not insert the pick more than 1/4 inch (6 mm) or you may damage the screen's flex cable. Leave the pick in the top right corner to prevent the adhesive from re-sealing.
    • Slide the pick along the right edge of the screen to cut the adhesive.

    • Do not insert the pick more than 1/4 inch (6 mm) or you may damage the screen's flex cable.

    • Leave the pick in the top right corner to prevent the adhesive from re-sealing.

  7. The screen adhesive is very weak and you should not need to re-apply heat. If the screen does feel hard to slice, apply heat to the difficult area for one minute and try again. Insert another opening pick into the right  edge of the phone at an angle where a gap has already formed to prevent damage to the OLED panel. Slide the opening pick around the bottom of the phone to cut the adhesive.
    • The screen adhesive is very weak and you should not need to re-apply heat. If the screen does feel hard to slice, apply heat to the difficult area for one minute and try again.

    • Insert another opening pick into the right edge of the phone at an angle where a gap has already formed to prevent damage to the OLED panel.

    • Slide the opening pick around the bottom of the phone to cut the adhesive.

    • Leave the pick inserted along the bottom edge to prevent the adhesive from resealing.

  8. Insert another opening pick into the bottom edge of the phone at an angle where a gap has already formed to prevent damage to the OLED panel. Use the pick to slice through the left edge of the phone. If the screen feels hard to slice, heat the left edge for one minute and try again.
    • Insert another opening pick into the bottom edge of the phone at an angle where a gap has already formed to prevent damage to the OLED panel.

    • Use the pick to slice through the left edge of the phone.

    • If the screen feels hard to slice, heat the left edge for one minute and try again.

    • Leave the pick inserted along the left edge of the phone to prevent the adhesive from re-sealing.

  9. Insert another opening pick into the left edge of the phone at an angle where a gap has already formed to prevent damage to the OLED panel. Slide the pick around the top edge of the phone to cut the adhesive. If the screen feels hard to slice, heat the top edge for one minute and try again.
    • Insert another opening pick into the left edge of the phone at an angle where a gap has already formed to prevent damage to the OLED panel.

    • Slide the pick around the top edge of the phone to cut the adhesive.

    • If the screen feels hard to slice, heat the top edge for one minute and try again.

  10. Once you have cut around the perimeter of the phone, carefully lift the right edge of the screen, opening the phone like a book. Do not remove the screen yet.
    • Once you have cut around the perimeter of the phone, carefully lift the right edge of the screen, opening the phone like a book.

    • Do not remove the screen yet.

    • Use an opening pick to carefully cut through any remaining adhesive.

  11. Lift from the top edge and swing the screen over the bottom edge until you can rest it glass-side down. Be careful not to put any stress on the attached ribbon cable. Be careful not to put any stress on the attached ribbon cable.
    • Lift from the top edge and swing the screen over the bottom edge until you can rest it glass-side down.

    • Be careful not to put any stress on the attached ribbon cable.

  12. Use a pair of tweezers to carefully peel up the black tape covering the screen connector bracket.
    • Use a pair of tweezers to carefully peel up the black tape covering the screen connector bracket.

    • If it is in good condition, you can re-use this tape during reassembly. Otherwise, replace it with a piece of electrical tape.

  13. Use a T3 Torx driver to remove the two 2.1 mm screws securing the screen connector bracket.
    • Use a T3 Torx driver to remove the two 2.1 mm screws securing the screen connector bracket.

  14. Use a pair of tweezers to remove the screen connector bracket.
    • Use a pair of tweezers to remove the screen connector bracket.

  15. Use the tip of a spudger to pry up and disconnect the screen flex cable. 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. Do not press down on the middle. If the connector is misaligned, the pins can bend, causing permanent damage.
    • Use the tip of a spudger to pry up and disconnect the screen flex cable.

    • 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. Do not press down on the middle. If the connector is misaligned, the pins can bend, causing permanent damage.

  16. Remove the screen.
    • Remove the screen.

    • Compare your replacement screen with the original. You may need to transfer additional components (such as speaker mesh) to the new part.

    • To install the new screen:

    • Scrape off remaining adhesive from the perimeter of the frame.

    • Follow this guide if you are using custom-cut adhesives.

    • If you are using double-sided tape such as Tesa tape, follow this guide.

  17. Use a T3 Torx driver to remove the eight 4.3 mm screws securing the back cover to the midframe. Use a T3 Torx driver to remove the eight 4.3 mm screws securing the back cover to the midframe.
    • Use a T3 Torx driver to remove the eight 4.3 mm screws securing the back cover to the midframe.

  18. Insert an opening pick into the seam between the midframe and the back cover. Slide the opening pick along the bottom edge of the phone to release the plastic clips securing the back cover to the midframe.
    • Insert an opening pick into the seam between the midframe and the back cover.

    • Slide the opening pick along the bottom edge of the phone to release the plastic clips securing the back cover to the midframe.

  19. Slide the opening pick around the left edge of the phone to release the plastic clips securing the back cover to the midframe. Slide the opening pick around the left edge of the phone to release the plastic clips securing the back cover to the midframe.
    • Slide the opening pick around the left edge of the phone to release the plastic clips securing the back cover to the midframe.

  20. Slide the opening pick around the top and right edges of the phone to release the rest of the clips. Slide the opening pick around the top and right edges of the phone to release the rest of the clips. Slide the opening pick around the top and right edges of the phone to release the rest of the clips.
    • Slide the opening pick around the top and right edges of the phone to release the rest of the clips.

  21. Carefully swing the back cover from the bottom of the phone over the top and around the back. Lay the back cover on the work surface and lightly rest the midframe on the back cover, being careful not to put any stress on the attached ribbon cables. Lay the back cover on the work surface and lightly rest the midframe on the back cover, being careful not to put any stress on the attached ribbon cables.
    • Carefully swing the back cover from the bottom of the phone over the top and around the back.

    • Lay the back cover on the work surface and lightly rest the midframe on the back cover, being careful not to put any stress on the attached ribbon cables.

  22. Use a T3 Torx driver to remove the seven screws securing the motherboard bracket: Three 2.9 mm-long black screws
    • Use a T3 Torx driver to remove the seven screws securing the motherboard bracket:

    • Three 2.9 mm-long black screws

    • Three 2 mm-long screws

    • One 4.1 mm-long screw

  23. Use the tip of a spudger to unclip the motherboard bracket from the upper-right and lower-right corners of the motherboard. Use the tip of a spudger to unclip the motherboard bracket from the upper-right and lower-right corners of the motherboard. Use the tip of a spudger to unclip the motherboard bracket from the upper-right and lower-right corners of the motherboard.
    • Use the tip of a spudger to unclip the motherboard bracket from the upper-right and lower-right corners of the motherboard.

  24. Use a pair of tweezers to remove the motherboard bracket. Use a pair of tweezers to remove the motherboard bracket. Use a pair of tweezers to remove the motherboard bracket.
    • Use a pair of tweezers to remove the motherboard bracket.

  25. Use the flat end of a spudger to pry up and disconnect the battery cable. Use the flat end of a spudger to pry up and disconnect the battery cable.
    • Use the flat end of a spudger to pry up and disconnect the battery cable.

  26. Use the tip of a spudger to disconnect the two  flex cables connecting the fingerprint sensor and buttons to the motherboard. Use the tip of a spudger to disconnect the two  flex cables connecting the fingerprint sensor and buttons to the motherboard. Use the tip of a spudger to disconnect the two  flex cables connecting the fingerprint sensor and buttons to the motherboard.
    • Use the tip of a spudger to disconnect the two flex cables connecting the fingerprint sensor and buttons to the motherboard.

  27. Remove the back cover. Remove the back cover.
    • Remove the back cover.

  28. Use the tip of a spudger to disconnect the headphone jack cable from the motherboard. Use the tip of a spudger to disconnect the headphone jack cable from the motherboard.
    • Use the tip of a spudger to disconnect the headphone jack cable from the motherboard.

  29. Insert an opening pick under the headphone jack and twist to release it from the adhesive securing it to the midframe. Remove the headphone jack. Remove the headphone jack.
    • Insert an opening pick under the headphone jack and twist to release it from the adhesive securing it to the midframe.

    • Remove the headphone jack.

  30. Pry up with the flat end of a spudger to disconnect the front-facing camera from the motherboard. Pry up with the flat end of a spudger to disconnect the front-facing camera from the motherboard.
    • Pry up with the flat end of a spudger to disconnect the front-facing camera from the motherboard.

  31. Use a pair of tweezers to remove the front-facing camera. Use a pair of tweezers to remove the front-facing camera.
    • Use a pair of tweezers to remove the front-facing camera.

  32. Use a T3 Torx driver to remove the two 4.1 mm screws securing the loudspeaker assembly. Use a T3 Torx driver to remove the two 4.1 mm screws securing the loudspeaker assembly.
    • Use a T3 Torx driver to remove the two 4.1 mm screws securing the loudspeaker assembly.

  33. Insert the tip of a spudger underneath the loudspeaker assembly. Be careful not to puncture the white membrane on either side of the speaker if you are intending to reuse it. Flip the loudspeaker assembly over so it lightly rests on top of the battery.
    • Insert the tip of a spudger underneath the loudspeaker assembly.

    • Be careful not to puncture the white membrane on either side of the speaker if you are intending to reuse it.

    • Flip the loudspeaker assembly over so it lightly rests on top of the battery.

  34. Use the tip of a spudger to disconnect the antenna flex cable from the loudspeaker assembly. Use the tip of a spudger to disconnect the antenna flex cable from the loudspeaker assembly. Use the tip of a spudger to disconnect the antenna flex cable from the loudspeaker assembly.
    • Use the tip of a spudger to disconnect the antenna flex cable from the loudspeaker assembly.

  35. Carefully peel the loudspeaker assembly up off of the tape underneath it. Be careful not to puncture the white membrane on either side of the speaker if you are intending to reuse it. Remove the loudspeaker assembly.
    • Carefully peel the loudspeaker assembly up off of the tape underneath it.

    • Be careful not to puncture the white membrane on either side of the speaker if you are intending to reuse it.

    • Remove the loudspeaker assembly.

  36. Use the tip of a spudger to disconnect the loudspeaker cable from the motherboard. Use the tip of a spudger to disconnect the loudspeaker cable from the motherboard.
    • Use the tip of a spudger to disconnect the loudspeaker cable from the motherboard.

  37. Use a T3 Torx driver to remove the three screws securing the motherboard:
    • Use a T3 Torx driver to remove the three screws securing the motherboard:

    • Two 2.9 mm-long black screws

    • One 2.1 mm-long screw

  38. Use the corner of an opening pick to peel up the tape covering the earpiece speaker.
    • Use the corner of an opening pick to peel up the tape covering the earpiece speaker.

  39. Use a pair of tweezers to completely remove the tape covering the earpiece speaker. It is not required to reinstall this tape during reassembly. It is not required to reinstall this tape during reassembly.
    • Use a pair of tweezers to completely remove the tape covering the earpiece speaker.

    • It is not required to reinstall this tape during reassembly.

  40. Insert the tup of a spudger underneath the bottom edge of the motherboard and pry it up enough to grip it with your fingers. Insert the tup of a spudger underneath the bottom edge of the motherboard and pry it up enough to grip it with your fingers.
    • Insert the tup of a spudger underneath the bottom edge of the motherboard and pry it up enough to grip it with your fingers.

  41. Remove the motherboard. Remove the motherboard.
    • Remove the motherboard.

Conclusion

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 installing.

To reassemble your device, follow the above steps 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.

Une autre personne a terminé cette réparation.

Sam Omiotek

Membre depuis le 25/02/2019

26 920 Réputation

180 tutoriels rédigés

Équipe

iFixit Membre de l'équipe iFixit

Community

138 membres

16 447 tutoriels rédigés

Longshot here… I dropped my phone and it appears to be dead, although no physical signs of damage. Right after it happened, I could see an image on the screen but it was frozen, so I pressed the power button and the screen turned off, and then I wasn’t able to turn it back on from then on. There are no signs of life at all… no lights, no vibrations, no sounds. If I plug it into my computer, nothing happens. So totally dead. I already opened it up and checked for any obvious damage to internal components or loose cables. Didn’t find any smoking guns, so I just tried disconnecting and re-connecting all the ribbon cables. Still no success. I’m wondering if you have any thoughts on whether a battery or motherboard replacement might bring my phone back to life, and if so, if you have any thoughts on one or the other. My initial thought is that’s it more likely that something on the motherboard got damaged from a physical drop vs. the battery, but any other input you could offer would be great.

Sally Hoo - Réponse

That’s a tough one Sally… I can’t guarantee replacing any certain component will fix your phone given the information. Disconnecting and reconnecting the cables was a good idea. No signs of life at all suggests to me it’s likely the battery or motherboard, like you said.

If it’s still under warranty see if Google will replace it, they replaced my pixel 3 twice when it bricked for no apparent reason. If it’s not then I think the best course of action would be to meticulously search for the damage starting with the motherboard. Use a magnifying glass. Even if a single tiny transistor popped off that would be enough to brick it. If you can’t find anything, you’ll have to take a chance replacing one part at a time until you get it working again.

Good luck!

Sam Omiotek -

Ajouter un commentaire

Nombre de vues :

Dernières 24 heures : 7

7 derniers jours : 60

30 derniers jours : 236

Total : 1,557