Every refurbished ASIC we sell passes the same bench that produced our repair guides. Before a unit is listed, it goes through visual inspection, a full chip-count and pattern test, per-domain voltage measurement, thermal cycling, burn-in at rated specification, and proactive replacement of worn fans, thermal paste, and connectors — then a final hashrate and efficiency check. “Tested” isn’t a marketing word here; it’s a checklist.

Plenty of resellers say a used miner is “tested” without ever showing the test. We repair ASICs for a living — board- and chip-level, since 2016 — so we publish exactly what every refurbished unit goes through. Repaired by the same bench that wrote the guides you’ve been reading.

The bench checklist — every refurbished unit

1. Visual inspection. Boards, connectors, heatsinks, and the PSU are checked for burn marks, corrosion, loose hardware, and shipping damage before anything is powered.
2. Chip-count & pattern test. Each hashboard is run on a test fixture to confirm a full chip count and clean pattern result — no “found 109 of 110” quietly shipped out.
3. Per-domain voltage check. We measure voltage across the power domains (voltage is per-domain, not per-chip) to catch a weak LDO or boost stage before it becomes your problem.
4. Thermal cycle & imaging. The unit is run through heat cycles and checked with thermal imaging for hot-spots from poor heatsink contact or a failing chip.
5. Burn-in at rated spec. It runs under sustained load to confirm it holds hashrate and stays stable — not just that it boots.
6. Proactive replacement. Tired fans, degraded thermal paste, and worn connectors are replaced as a matter of course, not left for the next owner.
7. Final verification. A last hashrate and efficiency check confirms the unit performs at its rated specification before it’s listed.

Graded honestly

Refurbished units are listed as refurbished — that’s the condition signal, plainly stated, never blurred into “like new.” If a unit has cosmetic wear or a known limitation, we say so on the listing. You’re buying the unit, not the label.

Warranty & coverage

New gear ships with the manufacturer warranty plus D-Central support. Refurbished units are backed by D-Central’s own warranty — because we’re the bench that tested and repaired them. Dead-on-arrival and defective units are covered under our Return & Refund Policy.

Is refurbished the right call?

A bench-tested refurbished miner can be the better value when its efficiency and remaining life suit your power cost. If you’re weighing it against new, read Refurbished vs New ASIC Miners: An Honest Buyer’s Guide — and if a unit you already own is on the line, the Repair vs Replace guide and our transparent repair pricing will tell you whether fixing it beats replacing it.

Shop bench-tested refurbished miners

• Browse refurbished ASICs — each one through the checklist above.
• Have one to repair instead? — send it to the same bench.

Last reviewed 2026-06-12.

Refurbished testing FAQ

What do you test on a refurbished ASIC miner?

Every refurbished unit runs the full bench sequence: visual inspection, chip-count and pattern test, per-domain voltage measurement, thermal cycling and imaging, burn-in at rated specification, and proactive replacement of worn fans, degraded thermal paste, and tired connectors — then a final hashrate and efficiency check.

What warranty do refurbished units carry?

New gear ships with the manufacturer warranty; refurbished units are backed by D-Central’s own warranty, because we’re the bench that tested and repaired them. Dead-on-arrival and defective units are covered under our Return & Refund Policy.

Is a refurbished ASIC worth it versus new?

A bench-tested refurbished unit can be the better value when its efficiency and remaining life suit your power cost — that’s exactly why we publish what we test, so you can judge the unit, not just the label. See Refurbished vs New.