Phone · Samsung · Galaxy S21 Ultra
Samsung Galaxy S21 Ultra Fingerprint Sensor Repair
Fingerprint Sensor Repair guide for the Samsung Galaxy S21 Ultra
Before you begin
Tools
- Heat gun or hair dryer
- Suction cup tool
- Plastic prying tools
- Precision screwdriver set (Phillips #00)
- Tweezers
- Spudger tool
- SIM eject tool
Parts / materials
- Replacement fingerprint sensor module
- Precut rear glass adhesive strips
- Isopropyl alcohol (99%)
Safety
- Wear safety glasses when handling phone panels with cracked glass.
- Disconnect the battery before touching internal components to prevent electrical shorts.
- Do not bend or puncture the lithium-ion battery with sharp metal tools.
Overview
Step-by-step
- 1
Power Off the Galaxy S21 Ultra
1 minPress and hold the Side key and Volume Down button simultaneously, then tap 'Power Off' on the screen.
- 2
Eject the SIM Tray
1 minInsert a SIM eject tool into the hole at the bottom of the phone to remove the SIM card tray.
- 3
Heat the Rear Glass Panel
2 minApply a heat gun evenly around the rear glass edges for two minutes to soften the adhesive.
- 4
Create an Entry Gap
2 minAttach a suction cup near the bottom edge of the back glass and pull up gently to form a gap.
- 5
Slice Through Back Cover Adhesive
4 minInsert a plastic opening pick into the gap and slide it along all four perimeter edges to separate the adhesive.
- 6
Remove the Rear Glass Cover
1 minCarefully lift the rear glass panel away from the phone frame once all adhesive is severed.
- 7
Unscrew Wireless Charging Assembly
3 minUse a Phillips #00 screwdriver to remove the screws securing the wireless charging coil and top shield.
- 8
Remove the Wireless Charging Coil
2 minGently pry up and peel the wireless charging assembly away from the motherboard frame.
- 9
Disconnect the Battery Cable
1 minUse the flat end of a plastic spudger to pry the battery connector straight up from the motherboard.
- 10
Unscrew and Remove Loudspeaker
2 minRemove the Phillips screws holding the bottom speaker module, then lift the speaker out of the frame.
- 11
Disconnect Fingerprint Sensor Flex
2 minLocate the fingerprint sensor flex cable connector on the lower circuit board and detach it using a spudger.
- 12
Remove the Defective Sensor Module
3 minApply mild heat to the front lower display area, then use fine tweezers to lift the sensor from behind the panel frame.
- 13
Position the New Fingerprint Sensor
2 minAlign the replacement sensor module into the recessed frame slot and gently press it into position.
- 14
Reconnect Flex Cables and Battery
2 minAttach the new sensor flex connector firmly, then reconnect the battery press connector to the motherboard.
- 15
Reinstall Speaker and Wireless Coil
3 minPlace the loudspeaker and wireless charging pad back onto the chassis and secure all Phillips screws.
- 16
Reseal Rear Glass Cover
3 minApply fresh precut adhesive to the phone frame perimeter and press the rear glass firmly in place.
After your Samsung Galaxy S21 Ultra fingerprint sensor repair
Power the Galaxy S21 Ultra back on and test the fingerprint sensor 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.
