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This antenna in the iPhone 6 Plus is responsible for picking up Wi-Fi signals.
Remove the single 1.4 mm Phillips screw holding the NFC bracket in place.
Remove the NFC bracket.
Remove the two 2.7 mm Phillips screws securing the audio control cable bracket to the logic board.
Remove the audio control cable bracket.
Disconnect the audio control cable by prying its connector straight up from its socket on the logic board.
Disconnect the cellular antenna cable by prying its connector straight up from its respective socket on the logic board.
Disconnect the Wi-Fi diversity antenna cable by prying its connector up from the logic board.
Disconnect the power button flex cable from its socket on the logic board.
Disconnect the Lightning connector interconnect antenna cable by prying it up from the logic board.
Use the flat end of a spudger to disconnect the Lightning connector flex cable from the logic board.
Deroute the antenna cable from the two clips on the right edge of the logic board.
Remove the following screws:
Use a small flathead screwdriver to remove this standoff screw.
One 1.3 mm Phillips screw
One 2.6 mm Phillips screw
One 2.2 mm Phillips standoff screw
Remove the bracket.
Deroute the upper left cellular antenna cable from the first logic board clip by nudging it out from under the clip, towards the battery.
Continue derouting the cellular antenna cable from the second and third logic board clips.
Use the pointed tip of a spudger to gently pry the cellular antenna cable from the middle logic board clip.
Do not pull the cable out of the center clip, as it will tear easily.
In order for the cable to reach its socket on the logic board, you must route it above the logic board and underneath the audio control flex cable, as shown in the first photo.
Remove the final 2.0 mm Phillips screw directly below the SIM card reader.
Carefully raise—but do not remove—the logic board, lifting it from the bottom edge nearest the Lightning connector.
Tip the logic board up to a vertical position to expose the single antenna connector on the underside, near the top edge of the board.
Do not attempt to fully remove the logic board yet, as the Wi-Fi/Bluetooth antenna is still connected to the underside of the board.
Gently lay the logic board upside-down, with the top portion resting against the rear case of the iPhone.
Use the flat end of the spudger to disconnect the Wi-Fi/Bluetooth antenna cable from its socket on the back of the logic board.
Remove the logic board.
Remove the sticker over the third screw holding the cellular antenna in place.
Remove the following three Phillips screws holding the cellular antenna in place:
One 2.7 mm screw
One 1.7 mm screw
One 1.3 mm screw
Remove the cellular antenna.
Remove the single 1.3 mm Phillips screw securing the antenna to the rear case.
Remove the Wi-Fi/Bluetooth antenna.