Introduction
Prereq to remove the motherboard from the interior midframe.
Tools
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Carefully wedge the tip of a spudger underneath the antenna cable connector.
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Delicately lift the spudger directly upwards to disconnect the antenna connector off its socket on the motherboard.
 
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Pull, but do not remove, the camera end of the motherboard up from the midframe to allow access to the connectors on the rear.
 
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Use the flat end of a spudger to pry the daughterboard connector straight up off its socket on the motherboard.
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.
Please let someone know about the screw under the camera and flash/heartbeat monitor, holding the motherboard to the midframe. I do not see a step for this before trying to remove the motherboard.
Jay Bird -
Same and all so in the s5 I disassembled there was 2 antenna cables the a blue one and a white one.
daniel willenbrok -
I also had 2 cables - a blue and a white one.
Paul Askin -
I second that: At least with the G900-V, there are two antenna cables, a blue one and a white one, .WARNING: Although each cable is of a unique length, you MUST remember or note which cable is connected to which socket, otherwise reassembly will be impossible.
OmniWeb Technical Education -