Teardown difficulty:
Moderate

Recommended tools

Disassembly of the mobile device Samsung Galaxy S21 Ultra SM-G998 (Samsung Galaxy S21 Ultra 5G) with each step description and the required set of tools.


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How to disassemble Samsung Galaxy S21 Ultra SM-G998, Step 1/1

Step 1. Before disassembling!

⚠️️ Before disassembling, do not forget to turn your phone off.


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Step 2. Remove the tray

Use the ejection tool (aka Needle) or Paperclip. Push the tip all the way into the hole until the tray ejects, and then pull the tray of SIM and Memory card (Micro SD) out.

⚠️️ Pay attention! The tool must be inserted into a hole on the edge of the phone's housing. Do not press too hard. It may break the tray eject mechanism.


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Step 3. Open the back cover

We recommend using a special heating device such as a separator machine, heat gun, or heating mat. It will simplify the process. You can use a home hairdryer, but you will have to make a nozzle by hand or have a suitable one in the kit to gently heat and concentrate the heat flow in the right place.

ℹ️️ The surface of the back cover must be heated to soften the adhesive underneath. The approximate heating temperature is 50° C / 125° F.

Use a thin plastic film or pick for separation. To facilitate the process, you can use isopropyl alcohol. It is often most difficult to pass the tool between the parts to be divided. Choose the far edge from the FFC cables or buttons.

Do not use a lever or any force for separation that could damage the elements inside.


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Step 4. Unscrew the screws

Using a screwdriver (Philips 1.5 mm PH000), unscrew six screws.


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Step 5. Remove the wireless charging

Disconnect the two connectors. Pry over edges and detach the cover with Wireless charging and NFC tag. The opposite side of the tag is glued to the lower cover with adhesive, so we have to carefully peel it off.


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Step 6. Disconnect the battery connector

Disconnect the battery connector as soon as possible. It is better to use a non-metal or plastic tool to avoid any damage.

ℹ️️ The Samsung Galaxy S21 Ultra 5G SM-G998 model has a battery EB-BG998ABY with 5000 mAh capacity (aka rechargeable battery).

⚠️️ It is highly recommended to disconnect the connector to avoid possible short circuits during disassembly.


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Step 7. Unscrew the screws

Using a screwdriver (Philips 1.5 mm PH000), unscrew four screws.


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Step 8. Remove the earpiece speaker

Pry up the connectors and carefully remove the cover with antennas tracks, sensors, flashlight and the earpiece speaker located from the inside.


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Step 9. Unscrew the screws

Using a screwdriver (Philips 1.5 mm PH000), unscrew four screws securing the cover.


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Step 10. Remove the loudspeaker

Pry at the edges and remove the loudspeaker assembly with antennas.


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Step 11. Remove the inter-board cables

Carefully, preferably from the edge, disconnect the connectors and remove two inter-board cables connecting the mainboard to the daughterboard (also known as the sub-board).

⚠️️ Be careful when removing the cables from the connectors, the cables are pretty thin, and it is easy enough to break them or damage the contact tracks inside.

ℹ️️ An arrow on the FFC cable (flexible flat cable) indicates its correct position.


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Step 12. Unscrew the screws

Using a screwdriver (Philips 1.5 mm PH000), unscrew three screws securing the sub-board.


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Step 13. Remove the daughterboard

Remove the sub-board.

It may be glued to the frame with metalized tape, so to facilitate the process, the sub-board can be heated a bit. The sub-board, also, may be attached with attachments like latches or hooks. Be careful.

ℹ️️ The sub-board contains a charging port (Micro-USB), microphone, spring contacts for the speaker, and an antenna unit.

⚠️️ It is not necessary to insert the tool underneath when removing the sub-board. Internal components could be damaged.


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Step 14. Disconnect the connectors

Pry up the connectors of power volume buttons cable, display module cable, rear camera, front camera.

⚠️️ Be careful when removing the cables from the connectors, the cables are pretty thin, and it is easy enough to break them or damage the contact tracks inside.


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Step 15. Remove the motherboard

Carefully remove the printed circuit board. There is no need to use a lever or try to reach the circuit board by force. Make sure that nothing is getting in the way or holding the circuit board.

The motherboard, also, may be attached with attachments like latches or hooks. Be careful.

⚠️️ Do not bend the circuit board when removing it or push tools under it. Unbeknownst to yourself, you can damage components or cables from the inside.


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Step 16. Remove the cameras

Pry up the connectors and carefully remove the assembly of the four rear cameras.


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Step 17. In the display frame remained

ℹ️️ In the display frame remained: the battery, front camera and vibration motor.

Detailed disassembly instructions of Samsung Galaxy S21 Ultra SM-G998 in the video, made by our mobile repair & service center:

If you have a question, ask us, and we will try to answer in as much detail as possible. If this article was helpful for you, please rate it.


Disassembling\Repair has medium complexity and takes about minutes in time. Our manual is suitable for all models Samsung Galaxy S21 Ultra SM-G998 — Samsung Galaxy S21 Ultra 5G released for markets in different countries.



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