Samsung SM-X818U Repair Manual page 134

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For the 5G or LTE devices, connect the 2 coaxial cables (White/Red) to the speaker
module carefully.
Place the speaker module to the exact position, and assemble it to the back cover
module.
Be careful not to damage the battery.
Be careful not to damage the cables and speaker module.
•
Be careful not to damage the near components.
•
Disassembly and Assembly
134