Phone · Samsung · Galaxy S21
Samsung Galaxy S21 Microphone Repair
Microphone Repair guide for the Samsung Galaxy S21
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
Step-by-step
- 1
Power off the phone
1 minPress and hold the side and volume down buttons until the power menu appears. Tap Power Off to safely shut down the device.
- 2
Heat the back glass
3 minApply 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
Attach the suction handle
1 minPlace a suction cup near the bottom edge of the rear glass cover. Press down firmly to create a tight seal.
- 4
Create an entry gap
2 minPull 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
Slice the perimeter adhesive
4 minSlide the opening pick around all four edges of the phone to cut through the adhesive seal. Reapply heat if the pick meets resistance.
- 6
Remove the back glass
1 minGently lift the back glass off the frame. Set it aside on a clean, scratch-free microfiber surface.
- 7
Unscrew the upper motherboard cover
3 minUse a Phillips #00 screwdriver to remove the five screws securing the upper plastic cover and wireless charging pad. Keep the screws organized.
- 8
Remove the wireless charging coil
2 minGently pry up the edges of the wireless charging coil module with a spudger. Lift and remove the assembly from the device.
- 9
Disconnect the battery cable
1 minUse 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
Unscrew the lower loudspeaker
2 minRemove the five Phillips #00 screws holding the loudspeaker assembly over the daughterboard at the bottom. Separate these from other screws.
- 11
Remove the loudspeaker
2 minInsert a spudger beneath the loudspeaker housing and pry upward to unclip it. Remove the module from the frame.
- 12
Eject the SIM tray
1 minInsert 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
Disconnect the ribbon cables
2 minPry up the press connectors for the main display flex cable and interconnect cable on the daughterboard. Bend the cables back slightly.
- 14
Unscrew the daughterboard
1 minRemove the single Phillips #00 screw holding the daughterboard down to the bottom chassis. Set the screw aside.
- 15
Remove the old microphone board
2 minInsert 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
Install the new microphone board
2 minAlign 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.

