How to quickly locate the ESD diode of an edge computing box after it is damaged?

If an edge computing box malfunctions after ESD testing, and the ESD diode is suspected to be damaged, a three-step quick troubleshooting method can be used:

1. Visual inspection: Use a 20x magnifying glass to observe the surface of packages such as SOD882 and DFN1006 for any cracks or bursts. 

2. Online IV curve testing: Use an oscilloscope or transistor tester to compare the voltage drop to ground on the same network of a normal board. For example, the forward voltage of the ESD5V0D8B should be approximately 0.6V, and the reverse voltage should be cut off. If it is short-circuited, both forward and reverse voltages should be 0V.

3. Disconnect the suspected component's solder pads for testing. If the short circuit persists, the chip itself is damaged; otherwise, the PCB will be burned out. Replacement will restore normal operation.

The recommended ESD5V0D8B from Yinte Electronics is recommended, as its junction capacitance is 5pF and its response time is <1ns, making it an ideal choice for edge computing box interfaces.