Circuit board testing system

A circuit board testing system comprising a testing fixture, the testing fixture being connected with a circuit board for testing plural wires of a cable of the circuit board, the testing fixture comprising:

• a first contact element connected with input terminals of odd-numbered wires of the plural wires and input terminals of even-numbered wires of the plural wires;
• a switch circuit connected with the first contact element, and providing a testing voltage to the first contact element;
• a second contact element connected with output terminals of the odd-numbered wires and output terminals of the even-numbered wires;
• a voltage acquisition element connected with the second contact element, and acquiring voltage values of the plural wires;
• and
• a control unit connected with the voltage acquisition element and the switch circuit, and reading the voltage values of the plural wires from the voltage acquisition element,
• wherein when the control unit drives a switching action of the switch circuit, the testing voltage is provided to the odd-numbered wires or the even-numbered wires, and the control unit reads the voltage values of the odd-numbered wires and the voltage values of the even-numbered wires from the voltage acquisition element, wherein the control unit judges whether functions of the plural wires of the cable are normal according to the voltage values of the odd-numbered wires and the voltage values of the even-numbered wires.