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After the mid-plane is removed, the motherboard can be simply lifted out of the rear case.
The daughter board at the top of the motherboard has an interesting design in that it is connected to the main motherboard via a ribbon cable that is sandwiched between the many layers of the motherboard.
On most devices, ribbon cables are attached with ZIF connectors or are soldered to the surface of the board, not sandwiched between layers.
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