Patent ID: 8350575

Claim:
An electrical connection defect detection system to detect whether an electrical connection between an under-test pin of an under-test device and a signal line of a circuit board is normal, wherein the electrical connection defect detection system comprises: a signal provider to provide a test signal to the under-test pin through the signal line; a detection module; an electrode board electrically connected to the detection module, wherein the electrode board comprises: a detection surface to contact a surface of the under-test device and keep a distance from the under-test pin such that the detection module detects a value of a capacitance associated with the electrode board, the under-test pin and the signal line larger than a threshold value when the signal provider provides the test signal to the under-test pin and when the connection of the under-test pin and the signal line is normal; and a plurality of grounding paths each corresponding to one of a plurality of not-under-test pin groups of the under-test device to make the plurality of groups of not-under-test pins connect to the ground potential.