Samsung SM-X818U Repair Manual page 145

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For the 5G or LTE devices, connect the 2 coaxial cables (Blue/Gray) to the speaker
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.
•
The coaxial cables are only available for the 5G or LTE devices.
•
The cables and connectors may vary depending on the country, region, or
•
specifications.
Disassembly and Assembly
145