Quick answer

Before condemning a PSU, rule out the wall, the cable, and a downstream short pulling it into protection. APW-series PSUs are repairable but failures are common.

Test the PSU in isolation, then look for a board-side short before replacing anything.

Full diagnostic flow

Disconnect the PSU from the boards and power it alone. Does its fan spin / output 12-15V?

No output, fan dead → PSU failure (or a tripped protection that won't reset). APW units often fail open. Repair or replace the PSU. [DIY with care] Error-code guide →
Outputs fine when isolated → PSU is fine alone but shuts down under a board. Reconnect boards one at a time — does one kill it?

PSU is fine alone but shuts down under a board. Reconnect boards one at a time — does one kill it?

One board trips the PSU → That board has a short drawing excessive current — a failed MOSFET, LDO, or cap pulling the bus down. Remove it and bench-diagnose; don't keep cycling the PSU into a short. [Send it in] Error-code guide →
Trips even with no boards / wrong input → Check input voltage and cable rating first (110V vs 220V, undersized cable). If input is correct and it still trips, the PSU is faulty. [DIY with care] Error-code guide →

This points at board-level damage. You can attempt it, but the realistic call for most owners is to send it to a repair bench.

Fix it yourself

Work the matching symptom decision tree and error-code guide step by step. Most cable, cooling, network and firmware faults are solvable on the bench you already own.

Send it to D-Central

Cracked solder, dead domains, shorted chips and EEPROM faults need a real repair bench. See transparent repair pricing or get a free repair quote — we diagnose and repair 38+ ASIC models in Laval, board-level, since 2016.

More tools: Kernel-Log Decoder · ASIC Fault Finder (650 codes) · All symptom trees

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Last reviewed June 12, 2026.