Repair guide Galaxy S21 (SM-G991B) - English - Rev.1.0


Usage Notices
4

Precautions for Repair
4

ESD (Electrostatic Discharge) Precautions
5

Instructional Icons
6

Software Update
7

Updating Software through FOTA
7

Software Update Failure
7

Updating Software through Smart Switch
7

Recovering from a Software Update Failure
8

Recovering on Another Computer
8

Performing a Factory Data Reset
9

Quality Test
11

Quality Test Using the Samsung Members App
11

Device Diagnostics
11

Test Items
12

Calibrations
25

Calibrations
25

Used Parts and Calibration Functions in Supported Models
25

Using the Self Repair Assistant App
26

Optical Fingerprint Sensor Calibration
31

Resetting the Battery Cycle Count
34

Range Sensor Calibration
37

Touch Screen Panel Calibration
39

Speaker Calibration
41

Under-display Camera Calibration (Fold Models Only)
43

Digital Hall Sensor Calibration (Fold and Flip Models Only)
45

Exploded View and Parts List
48

Exploded View
48

Parts List
49

Disassembly and Assembly
50

Tools for Disassembly and Assembly
50

Fasteners (Adhesives and Materials) for Assembly
53

Disassembly for Back Cover, Display, and Charging Port Replacement
54

SIM Card Tray Remove
55

Button Remove
56

Back Cover Remove
59

Wireless Charging Module and Bottom Speaker Remove
69

Charging Port Remove
73

Main Board Remove
75

Front Camera Remove
79

Display Module
81

Reassembly for Back Cover, Display, and Charging Port Replacement
82

Preparing a New Display Module
82

Front Camera Assembly
84

Main Board Assembly
86

Charging Port Assembly
90

Wireless Charging Module and Bottom Speaker Assembly
92

Back Cover Assembly
95

Button Assembly
98

SIM Card Tray Assembly
101

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