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Samsung Galaxy S21 Ultra Microphone Repair

Microphone Repair guide for the Samsung Galaxy S21 Ultra

Moderate
~30 min
15 steps

Before you begin

Tools

  • Heat gun or hair dryer
  • Suction cup tool
  • Plastic prying tools
  • Spudger tool
  • Precision screwdriver set (Phillips #000)
  • Tweezers
  • SIM eject tool

Parts / materials

  • Replacement Galaxy S21 Ultra daughterboard (primary microphone assembly)
  • Rear glass replacement adhesive strip
  • Isopropanol alcohol wipes

Safety

  • Wear safety glasses to protect your eyes when working around heated glass.
  • Disconnect the battery press connector before touching internal components to prevent short circuits.
  • Do not bend or puncture the lithium-ion battery during disassembly.

Overview

# Samsung Galaxy S21 Ultra Microphone Repair Repair Guide Action-specific microphone repair walkthrough for the Samsung Galaxy S21 Ultra. About 30 minutes across 15 steps. This DIY guide walks through microphone repair on the Samsung Galaxy S21 Ultra (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 Ultra specifically—not a similar Galaxy S sibling. Most DIY techs finish this Samsung Galaxy S21 Ultra 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 Ultra job: Heat gun or hair dryer, Suction cup tool, Plastic prying tools, Spudger tool, Precision screwdriver set (Phillips #000), Tweezers, SIM eject tool. Parts and supplies: Replacement Galaxy S21 Ultra daughterboard (primary microphone assembly), Rear glass replacement adhesive strip, Isopropanol alcohol wipes. Power the Galaxy S21 Ultra 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 Ultra, 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 device and eject SIM tray

    1 min

    Ensure your phone is completely turned off. Insert a SIM eject pin into the hole on the bottom left of the phone to remove the SIM tray.

  2. 2

    Heat the rear glass perimeter

    3 min

    Apply heat evenly around the edges of the back cover using a heat gun for 2 to 3 minutes. This softens the waterproof adhesive holding the glass.

  3. 3

    Attach suction cup to back panel

    2 min

    Place a suction cup near the bottom edge of the rear glass. Pull up firmly to create a small gap between the glass and the frame.

  4. 4

    Slice lower edge adhesive seam

    2 min

    Insert a plastic opening pick into the gap created by the suction cup. Carefully slide the pick back and forth along the bottom edge to cut the adhesive.

  5. 5

    Slice side and top adhesive seams

    4 min

    Work the opening pick along the left, right, and top edges of the phone. Be careful around the camera housing to prevent cracking the glass.

  6. 6

    Remove the rear glass panel

    1 min

    Lift the rear glass off the frame completely once all adhesive is severed. Set the glass aside on a soft, clean surface.

  7. 7

    Unscrew the wireless charging bracket

    3 min

    Remove the six Phillips #000 screws securing the wireless charging coil and NFC shield to the chassis.

  8. 8

    Remove the wireless charging assembly

    2 min

    Use tweezers or a spudger to unhook the edges of the wireless charging pad, then lift the entire assembly out of the device.

  9. 9

    Disconnect the battery flex cable

    1 min

    Use the flat edge of a plastic spudger to pry the battery connector straight up from the motherboard to cut power.

  10. 10

    Unscrew the lower loudspeaker housing

    2 min

    Remove the five Phillips #000 screws holding the loudspeaker module down over the lower sub-board.

  11. 11

    Lift out the loudspeaker assembly

    2 min

    Pry up the edge of the loudspeaker using a spudger and remove it from the bottom of the frame.

  12. 12

    Disconnect the daughterboard flex cables

    2 min

    Pry up the display and main interconnect flex cable connectors attached to the lower sub-board with a spudger.

  13. 13

    Unscrew the sub-board assembly

    1 min

    Remove the single Phillips #000 screw securing the daughterboard to the lower section of the phone frame.

  14. 14

    Remove the primary microphone sub-board

    2 min

    Gently insert a plastic spudger beneath the daughterboard and pry it up. This board contains the primary microphone and USB-C port.

  15. 15

    Install the replacement microphone sub-board

    2 min

    Align the new sub-board into the lower housing slot and press down gently until it sits flat and flush.

After your Samsung Galaxy S21 Ultra microphone repair

Power the Galaxy S21 Ultra 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 Ultra 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 Ultra repair context in the encyclopedia, or open related DIY guides.

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