Definition
A short circuit is an unintended low-resistance connection that lets current bypass its intended path and flow in an excessive, uncontrolled amount. On an ASIC hashboard a short is one of the most common and most diagnosable faults: a shorted switching MOSFET, a failed capacitor, or a damaged chip creates a near-zero-resistance path that drags a voltage rail down and draws huge current.
How a short presents
Powered on a current-limited bench power supply, a board with a short immediately pegs the current limit instead of idling at a fraction of an amp — the unmistakable signature of a short. With the board off, a multimeter in continuity or resistance mode reads near zero between a rail and ground where it should read high. Slowly raising voltage while watching current also heats the shorted part, which a thermal camera or a careful fingertip can locate.
Finding and fixing it
Once the shorted domain is identified, the technician inspects its buck converter MOSFETs, capacitors and the chips it feeds, removing or replacing the failed component. Because a current-limited supply caps the damage, methodical short-hunting is safe — which is exactly why bringing a repaired board up on a bench supply, never straight on a PSU, is standard practice.
Short-hunting ties together the bench power supply, the multimeter, and the voltage domain.
In Simple Terms
A short circuit is an unintended low-resistance connection that lets current bypass its intended path and flow in an excessive, uncontrolled amount. On an ASIC…