Abstract: An electronic device includes a circuit board and a conductive piece. The circuit board includes a hole and a grounding pad close to the hole. The conductive piece includes an insertion component and an enlarged grounding portion connected to the insertion component. The insertion component of the conductive piece is inserted into the hole of the circuit board and is electrically connected to the grounding pad, and a size of the enlarged grounding portion is larger than that of the hole.

Abstract: A circuit board assembly includes a circuit board, a shielding frame, a chip, and a heat dissipating member. The shielding frame is fixed to and protrudes from the circuit board. The shielding frame includes a first encircled positioning portion away from the circuit board. The chip is disposed on the circuit board and is located in the shielding frame. The heat dissipating member is detachably disposed on the shielding frame, and includes a plate and a second encircled positioning portion disposed on the plate. When the heat dissipating member is disposed on the circuit board, the plate leans against the shielding frame and covers the chip, the second encircled positioning portion and the first encircled positioning portion correspond with each other in shape and position, so as to position the plate and the shielding frame. A shielding device is also disclosed.