Electronic device

1. An electronic device comprising:

a casing comprising a rigid polymeric material forming a closed chamber;

a printed-circuit board having tracks; said printed-circuit board being positioned in the chamber and thereby defining a dissipation chamber that is formed by the area between a surface of the printed-circuit board and the casing;

at least one electronic component positioned in the dissipation chamber;

a metallic dissipation film arranged on an internal surface of the casing within the dissipation chamber, the metallic dissipation film embracing an area larger than the projected area of the electronic components; and

a filler arranged to be located in the chamber such that said filler simultaneously contacts directly with all portions of a perimeter of the electronic component that are within the dissipation chamber and above a portion of the electronic component that is engaged with the printed-circuit board, with the surface of the printed-circuit board, with the tracks of the printed-circuit board and the metallic dissipation film,

wherein the filler is arranged to be located in the chamber in simultaneous contact with the surface of the printed-circuit board, with the tracks of the printed-circuit board, with the metallic dissipation film and with all portions of the perimeter of the electronic component that are above a portion of the electronic component that is engaged with the printed-circuit board while the filler is initially in a fluid state and without any film therebetween and without any material containing the filler.