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Samsung Galaxy S21 Microphone Repair

Microphone Repair guide for the Samsung Galaxy S21

Moderate
~30 min
16 steps

Before you begin

Tools

  • Phillips #00 screwdriver
  • Heat gun or iOpener
  • Suction handle
  • Plastic opening picks
  • Spudger
  • SIM eject tool
  • Tweezers

Parts / materials

  • Replacement Galaxy S21 daughterboard with primary microphone
  • Pre-cut back cover adhesive sticker
  • Isopropyl alcohol (99%)

Safety

  • Wear eye protection when applying heat to glass components to protect against flying fragments.
  • Disconnect the battery press connector before touching or removing internal circuit boards.
  • Do not puncture or bend the lithium-ion battery while prying inside the device.

Overview

# Samsung Galaxy S21 Microphone Repair Repair Guide Action-specific microphone repair walkthrough for the Samsung Galaxy S21. About 30 minutes across 16 steps. This DIY guide walks through microphone repair on the Samsung Galaxy S21 (Galaxy S series phone). Before you open the device, confirm the exact model number on the Samsung settings screen or rear housing so your replacement part matches the Galaxy S21 specifically—not a similar Galaxy S sibling. Most DIY techs finish this Samsung Galaxy S21 microphone repair in about 30 minutes when parts and tools are ready. Difficulty is rated intermediate for this model. Recommended tools for this Samsung Galaxy S21 job: Phillips #00 screwdriver, Heat gun or iOpener, Suction handle, Plastic opening picks, Spudger, SIM eject tool, Tweezers. Parts and supplies: Replacement Galaxy S21 daughterboard with primary microphone, Pre-cut back cover adhesive sticker, Isopropyl alcohol (99%). Power the Galaxy S21 off completely, remove SIMs/SD cards if present, and work on a clean, well-lit surface with a magnetic mat for screws. If a step feels wrong for your Samsung Galaxy S21, stop and compare the connector layout to the photos in this guide. When you prefer a same-day pro repair in Seattle instead, LML Repair can handle microphone repair for this model with tested parts and a workmanship warranty.

Step-by-step

  1. 1

    Power off the phone

    1 min

    Press and hold the side and volume down buttons until the power menu appears. Tap Power Off to safely shut down the device.

  2. 2

    Heat the back glass

    3 min

    Apply heat to the edges of the rear glass cover for two minutes using a heat gun or iOpener. This softens the strong factory adhesive beneath the glass.

  3. 3

    Attach the suction handle

    1 min

    Place a suction cup near the bottom edge of the rear glass cover. Press down firmly to create a tight seal.

  4. 4

    Create an entry gap

    2 min

    Pull up on the suction handle to create a small gap between the glass and the body frame. Insert an opening pick into the gap.

  5. 5

    Slice the perimeter adhesive

    4 min

    Slide the opening pick around all four edges of the phone to cut through the adhesive seal. Reapply heat if the pick meets resistance.

  6. 6

    Remove the back glass

    1 min

    Gently lift the back glass off the frame. Set it aside on a clean, scratch-free microfiber surface.

  7. 7

    Unscrew the upper motherboard cover

    3 min

    Use a Phillips #00 screwdriver to remove the five screws securing the upper plastic cover and wireless charging pad. Keep the screws organized.

  8. 8

    Remove the wireless charging coil

    2 min

    Gently pry up the edges of the wireless charging coil module with a spudger. Lift and remove the assembly from the device.

  9. 9

    Disconnect the battery cable

    1 min

    Use the flat end of a spudger to pry the battery press connector straight up from its socket. This cuts power to prevent electrical shorts.

  10. 10

    Unscrew the lower loudspeaker

    2 min

    Remove the five Phillips #00 screws holding the loudspeaker assembly over the daughterboard at the bottom. Separate these from other screws.

  11. 11

    Remove the loudspeaker

    2 min

    Insert a spudger beneath the loudspeaker housing and pry upward to unclip it. Remove the module from the frame.

  12. 12

    Eject the SIM tray

    1 min

    Insert a SIM eject tool into the hole at the bottom frame next to the SIM slot. Press firmly to pop out and remove the tray.

  13. 13

    Disconnect the ribbon cables

    2 min

    Pry up the press connectors for the main display flex cable and interconnect cable on the daughterboard. Bend the cables back slightly.

  14. 14

    Unscrew the daughterboard

    1 min

    Remove the single Phillips #00 screw holding the daughterboard down to the bottom chassis. Set the screw aside.

  15. 15

    Remove the old microphone board

    2 min

    Insert a spudger under the edge of the daughterboard and gently pry it up from the chassis adhesive. Lift out the board containing the microphone.

  16. 16

    Install the new microphone board

    2 min

    Align the replacement daughterboard over the bottom well and press down gently until it sits flush. Ensure the microphone port aligns with the frame opening.

After your Samsung Galaxy S21 microphone repair

Power the Galaxy S21 back on and test the microphone repair function before you put every screw away. Check touch/display response, charging, cameras, buttons, and wireless as relevant to this repair. If something fails after closing the device, reopen carefully and reseat the connectors for this Samsung Galaxy S21 job before assuming the part is defective. Keep leftover adhesive and screws labeled in case you need a second pass.

Keep learning

Explore more Samsung Galaxy S21 repair context in the encyclopedia, or open related DIY guides.

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