K3L Antminer Hashboard Tester - S19, S21, T21, KS3, KS5

Description

The K3L multi-function Antminer hashboard tester with RI probe, covering S19, S21, T21, KS3 and KS5 boards. This is the tool that turns “the miner is broken” into “chip 41 in domain 5 is dead”. Without a fixture you are swapping parts on a hunch; with one you are doing repairs.

What it does

A hashboard test fixture powers and clocks a board outside the miner, walks the chip chain, and reports which chips respond and where the chain stops. The RI (resistance/impedance) probe lets you check voltage domains against expected values so you can find a shorted or open domain before you ever apply full power to it.

Model	K3L multi-function hashboard tester
Listed board coverage	Antminer S19, S21, T21, KS3, KS5
Included tooling	RI probe for voltage-domain checks

We are describing what the fixture does rather than inventing electrical specifications for it. Ask us for the exact adapter set and software version included and we will confirm before shipping.

Why the coverage list matters more than the price

Fixtures are adapter-bound. A tester that covers S19 and S21/T21 and the KS3/KS5 Kaspa boards is doing three different jobs, and that breadth is the value if your bench sees mixed inventory. If you only ever touch S19 boards, a narrower fixture will do. Tell us what is actually on your bench and we will point you at the right one rather than the expensive one.

What a fixture pays for

The economics are simple: one avoided unnecessary hashboard purchase usually covers a fixture, and roughly half the “dead hashboard” units that reach our bench turn out to have a healthy board and a sick PSU, control board or ribbon cable. Testing first is the cheapest step in the whole repair.

Condition and warranty

Condition grade and warranty terms on this fixture are not stated in the listing, so we are not going to state them here. Ask us before you order and we will confirm both in writing.

Before you order

We repair this hardware in-house, so if you are not sure the part fits, send us the model and the silkscreen part number off your board and we will check it against stock. More spares and test gear in repair parts & tools, or browse all miners.

What’s in the box

1 × K3L Multi-function Antminer Hashboard Tester S19 S21 T21 KS3 KS5 RI
Nothing that is not listed above. Cords, controllers, brackets and spares are only included when this listing names them — if you need to know before you pay, ask on +1 (781) 577-0377 or ns@ingmining.com and we will confirm in writing what is physically in the crate

Questions buyers ask about this part

Is this a complete, working machine?

No. This listing is on the parts and repair shelf, which holds both brand-new spares and bench tools and as-is units sold for repair. Which of those this one is, is stated in the description above — read it before you order, and ask us on +1 (781) 577-0377 or ns@ingmining.com if anything about compatibility with your fleet is unclear. We would rather answer the question than take a return.

What should I check the day it arrives?

Photograph the pallet or box before you open it, keep the packaging, and run the 48-hour acceptance test straight away. Freight claim windows are short, and a fault found on day two is a conversation while a fault found on day thirty is an argument. Our own six-step bench procedure is published in full, so you can repeat exactly what we did.

Shipping cost for this exact item, and how warranty and returns work here, are answered in the Shipping & buying tab on this page. Anything else, ask a person on +1 (781) 577-0377 or ns@ingmining.com — we would rather talk before you buy.

Related hardware and where this sits in the store

Parts, fixtures and tools that go with the same repair job:

Category: Need Parts.

If you are buying a lot of any size, buy the diagnostic fixture with it. Our used-miner buying guide makes the case plainly: without one you cannot separate a worn fan from a dead hashboard, and you will scrap repairable machines.

Fixture coverage is the spec that matters, not the price. The parts guide sets out the arithmetic for when a hashboard fixture pays for itself, and it says plainly that for a single miner it does not.

Where this listing sits

This one is on the parts and repair shelf. That shelf holds two different things: brand-new spares and bench tools, and as-is units sold for repair. Which of the two this listing is, is stated in its own description — read it before you order.

What our grades mean

These are the only words we use, and each one means a specific thing. They are not interchangeable and we do not soften them to move stock.

New	Unused stock. Factory sealed unless the listing says otherwise — “new, open box” means exactly that, and the listing will say it.
Tested working	Second-hand, and it ran on our bench at the hashrate the listing states. We measured it; we are not repeating what the last owner told us. Expect cosmetic wear.
Refurbished	Tested working, plus work done: cleaned, thermal paste and fans dealt with, failed components replaced. The listing says what was actually done to that unit rather than using the word as decoration.
As-is / for parts	Sold with no working claim at all, at a price that reflects it. Buy these to repair or to harvest. If a listing says as-is, assume it does not hash until you have proved otherwise.
Untested	We have it, we have not powered it, and we are not going to pretend we did. Rarer than as-is and always stated explicitly.

What a grade here does not mean

Cosmetic wear is not a fault. Dust, scratches, scuffed labels and discoloured plastics are normal on hardware that has been earning. We photograph what we have; if the pictures matter to you, ask for more and we will take them.
A grade is not a warranty. Warranty terms are stated per listing, never per store — see the Shipping & buying tab. A tested-working grade describes what the machine did on our bench, not what we owe you in six months.
A boosted hashrate is not a spec. Where a unit ships on tuned firmware we say so and we give the factory figures too, because overclocking raises power faster than it raises hashrate — a tuned machine is less efficient per terahash than stock, not more.
We will not invent a grade to fill a field. If a unit came in without history and has not been through the bench, its listing says that.

How the grade gets decided

A used-hardware seller who will not tell you how they test is asking you to take the grade on trust. Ours is published: the six-step bench procedure every machine goes through, and the five measurements that get recorded — per-board hashrate, chip count, measured wall power rather than the nameplate figure, hardware error rate, and temperature under sustained load. When it reaches you, run the 48-hour acceptance test straight away, while the freight claim window is still open.

Buying second-hand for the first time? How to buy a used ASIC miner without getting burned is the long version, written from the repair bench rather than from a spec sheet.

Shipping

Shipping this item inside the United States costs $49.99 by UPS Ground — that is the rate the checkout will charge, read from the store’s own shipping settings, not an estimate. Orders ship within 7 business days.

Outside the United States the checkout quotes a flat international rate. On multi-unit or pallet orders, contact us before ordering so freight to your destination can be confirmed properly. What to check when the pallet arrives, and how a freight claim works, is covered in the mining hardware shipping guide.

What to do the day it arrives

Photograph the pallet or the box before you open it, and keep the packaging until you are satisfied. Freight claim windows are short, and damage found on day two is a conversation while damage found on day thirty is an argument.

Then run the 48-hour acceptance test straight away, while that window is still open. It is the same ground our own bench covers, so you can compare like for like: how the grade on this listing was arrived at, and the five measurements we record, are set out in the Condition & grading tab on this page.

Condition, warranty and returns

Condition: Repair part or bench tool — this shelf holds both new spares and as-is units, so read the condition stated in the description.

Warranty is stated per listing, not across the catalogue. Some units carry a manufacturer term and say so above, naming the term and the date it runs from. Many units, particularly used and AS-IS stock, carry none, and those listings do not claim one. There is no blanket warranty covering a catalogue that runs from sealed factory stock to a hashboard sold for parts. For what a mining warranty normally covers, see ASIC miner warranty explained.

Returns: ask for the terms on this unit before you pay. No single returns window is published for the whole store, because the sensible terms on a tested working machine and on a board sold AS-IS for parts are not the same terms. Email or call and ask what applies to this exact item — it is a two-minute conversation and a great deal cheaper than a dispute.

Who you are buying from

ING Mining LLC, Hanson, Massachusetts. ING MINING® is a registered U.S. trademark; our marketplace feedback is on the reviews page and the longer version of who we are is on about. Reach a person on +1 (781) 577-0377 or ns@ingmining.com.

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K3L Multi-function Antminer Hashboard Tester S19 S21 T21 KS3 KS5 RI Probe

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Description

What it does