Quickly determine whether an HDMI cable is "short-circuited" in 30 seconds - in fact, it involves using a multimeter to check for abnormal conduction between the 5V power pin and the ground pin.

The entire process can be completed in 3 steps and 30 seconds, without the need for wire removal or an oscilloscope.

Tools (Note: "工具" can also be translated as "Tools" or "Instruments", depending on the context. Here, "Tools" is used as a generic term for various tools used in various fields.)

Digital multimeter (buzzer or 200Ω resistance range)

HDMI cable to be tested (with both ends exposed)

30 seconds, 3 steps to operate

Reset to zero (5s)

Short-circuit the probe to confirm that the buzzer sounds and the reading is less than 1Ω, to avoid interference from the probe's own resistance.

"To the feet (10s)"

The HDMI-A male connector should be placed with its front side up, and the 18th pin on the far right is the +5V power supply, while the 17th pin is the ground (GND).

Place the red probe on pin 18 and the black probe on pin 17 (see figure).

Interpretation (15s)

The buzzer does not sound and the reading is > 10 kΩ → there is no short circuit, and the wire is likely normal.

Buzzer beeps continuously or reading < 5 Ω → Pin 18 is short-circuited to ground, the wire is internally broken down, or there is solder bridging. Discontinue use immediately.

Supplementary 10-second optional check

Touch the pen separately

19th pin (HPD) vs 17th pin (GND)

Pin 15 and 16 (SCL/SDA) vs Pin 17

As long as any pair of horns chirp, it indicates a short circuit between the signal pin and the ground, and it is also determined to be scrapped.