Patent ID: 8713392

Claim:
A circuitry testing module for testing an external circuit of a light emitting diode (LED), the LED comprising a first end and a second end, the circuitry testing module comprising: at least one logic unit having two input terminals connecting to the first end and the second end of the LED correspondingly; and a latch circuit connected to an output terminal of the at least one logic unit; wherein in response to normal operation of the external circuit determined by the at least one logic unit, the latch circuit outputs a first latch signal; and in response to abnormal operation of the external circuit determined by the at least one logic unit, the latch circuit outputs a second latch signal; wherein the latch circuit comprises a microchip, the microchip comprises a power supply contact connected to a power supply, a clock contact, a data contact and an output contact; the clock contact and the data contact are connected to the output terminal of the logic unit and grounded by a first resistor; when the at least one logic unit determines the external circuit works normally, the logic unit outputs a first logic operating signal to the clock contact, the clock contact triggers the data contact to receive the first logic operating signal, the output contact outputs the first latch signal; otherwise when the at least one logic unit determines the external circuit works abnormally, the data contact does not receive the first logic operating signal output from the logic unit, the output contact outputs the second latch signal.