| CPC H05K 7/1417 (2013.01) [G06F 1/185 (2013.01)] | 11 Claims |

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1. A main board assembly, adapted to mount an expansion element, wherein the expansion element comprises an electrical connection portion, one end of the electrical connection portion comprises a buckling portion, and the main board assembly comprises:
a main board, comprising a slot, wherein the slot is adapted for insertion of the electrical connection portion;
a shielding board, disposed on one side of the main board and comprising an opening;
a buckling member, movably disposed at one end of the slot, and adapted to buckle the buckling portion; and
an operating member, comprising a first end and a second end, wherein the first end is coupled to the buckling member, and the second end extends through the opening to one side of the shielding board away from the main board.
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