Ball grid array semiconductor package

A ball grid array (BGA) semiconductor package, comprising:

• a substrate having an upper surface and a lower surface opposed to the upper surface, the upper and lower surfaces being formed with a plurality of conductive traces each of which has a terminal, wherein an insulating material is applied over the upper and lower surfaces of the substrate to cover the conductive traces with the terminals of the conductive traces being exposed to outside of the insulating material, and a plurality of conductive vias are formed through the substrate for electrically interconnecting the conductive traces on the upper and lower surfaces, and wherein at least a predetermined position other than the terminal of the conductive trace is formed with a discontinuity, allowing the discontinuity and a portion of the conductive trace around the discontinuity to be exposed to outside of the insulating material and form a discontinuous first pad;
• at least a chip mounted on and electrically connected to the upper surface of the substrate;
• an encapsulant formed on the upper surface of the substrate for encapsulating the chip;
• and
• at least a first solder ball selectively and detachably implanted on the discontinuous first pad in a manner that, the conductive trace having the first pad is electrically conducted as the first solder ball is bonded to the first pad, and is electrically disconnected as the first pad is free of the first solder ball thereon.