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

Usage Notices

• Make sure to wear the appropriate safety equipment before carrying out repairs. Samsung is not responsible for injuries that may occur because of not wearing the proper safety equipment. Refer to Tools for Disassembly and Assembly for a list of tools that you will need for assembling and disassembling the device. • Repair the device in a safe place. • Before repairing the device, make sure the device is turned off. To turn off the device, press the Volume Down button and the Side button at the same time, or open the notification panel and tap the Power icon. • If the device is damaged, emits smoke, or if you smell something burning, stop using the device immediately and contact Samsung. • It is recommended to use safety equipment such as glasses, gloves, and a mask when repairing the device. • Be careful not to damage the device when removing the back cover. • Before assembly, ensure that there are no screws or foreign objects around the battery. • During assembly, check if there are any abnormalities before reattaching the back cover, and be careful not to damage the battery by hitting or denting it. If the battery is damaged, visit a Samsung Service Center. • Do not place the device directly into a microwave and heat it. • Before repairing your device, make sure its battery is fully discharged. • Visit www.samsung.com to view the device information, related material, and safety information. ESD (Electrostatic Discharge) Precautions It is the sudden flow of electricity between two electrically charged objects caused by contact, an electrical short, or dielectric breakdown. ESD can cause negative effects on mobile phone, especially electrical parts. • It is recommended to use ESD safety (Anti-static) equipment such as an anti-static wrist strap and gloves, and an ESD safe mat when repairing the device. • Increase the airflow to the work area to decrease the chance of accidental static electricity discharges, as the potential for static electricity discharge may be increased in low-humidity environments, such as air-conditioned rooms.

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