Disassembling an Antminer is a straightforward, repeatable procedure once you understand the stack: case → fans → power → hashboards → control board. Almost every Bitmain unit from the S9 era through the S21 follows the same physical logic, so this is the general overview — the safe sequence, the right tools, and the traps that kill boards. When a specific model needs board-level detail, jump to the model-specific control-board guides linked below.
Before you open anything: power off, unplug the PSU from the wall, and wait. The low-voltage DC bus that feeds the hashboards runs at roughly 8–21V and is not a shock hazard, but the power supply itself is a different animal — the mains-side and PFC capacitors inside an APW-series PSU hold around 410–420V DC and can bite hard minutes after unplugging. Never open a PSU casing as part of a routine teardown. Work on the miner, leave the sealed PSU alone.
What You’ll Need
- Antistatic wrist strap — clipped to bare chassis metal or a grounded point. ASIC chips and the control-board SoC are static-sensitive; a single discharge can silently degrade a domain.
- Phillips (PH1/PH2) screwdrivers — magnetic tips help you retrieve dropped screws before they land on a board and short something.
- Nut driver / socket set — later models (S17/S19/S21) bolt the hashboard power leads to a copper bus-bar; you’ll need the correct hex socket, not pliers.
- Soft ESD-safe brush and compressed air — for dust; keep air pressure moderate so you don’t over-spin the fans.
- A labeled tray or magnetic mat — screws differ in length between case, fan cage, and board mounts; mixing them cross-threads housings on reassembly.
- Phone camera — photograph every connector and cable route before you pull it. Highest-value habit in the whole job.
Step 1 — Ground Yourself and Set Up
Confirm the miner is off and the PSU is disconnected from mains. Put on the wrist strap and work on a hard, non-carpeted surface. Give the unit a few minutes to cool if it was just running — heatsinks and the chassis around the hashboards get hot enough to burn.
Step 2 — Remove the Case
Antminers ship in a two-piece extruded aluminum tube plus end caps. The screws are on the top, bottom, and both end plates. Back them all out and slide the shell off in line with the boards — don’t lever it sideways, since the fan wiring and control board sit right at the ends. Keep case screws separate from everything else.
Step 3 — Disconnect and Extract the Fans
You’ll see one or two fans at each end (front intake, rear exhaust). Each fan uses a 6-pin connector — doubled 12V power and ground, plus tachometer and PWM speed-control lines — that plugs into the control board or a fan header. Unplug the connector first, then remove the four corner screws — pulling a fan out while it’s still plugged in stresses the header and can tear a pad. Note which fan faced which way; airflow direction matters on reassembly.
Step 4 — Handle the Power Connections
How the hashboards get their DC power depends on the generation, and this is where people damage hardware:
- S9-class and earlier: each hashboard has its own dedicated power lead/connector from the PSU. Unplug them one board at a time.
- S17, S19, and S21 families: the hashboards are fed through a bolted copper bus-bar. Unbolt the bus-bar hardware with the correct socket and lift it clear before you touch the boards. Don’t yank boards while the bus-bar is still torqued down — you’ll crack solder joints or strip a stud.
Also unplug the thin signal/data ribbon cables that run between the control board and each hashboard. These are fragile; release any latch and pull on the connector body, never the wires.
Step 5 — Remove the Hashboards
The hashboards carry the ASIC chips that do the actual SHA-256 work — the BM1387 on the S9, BM1397 across the S17/T17 generation, BM1398 on the original S19/S19 Pro, and the BM1368/BM1370 on the S21 line. They are the most expensive and most fragile part of the miner. Once power and signal are disconnected, remove the board mounting screws and slide each board straight out along its rails. Handle boards by the edges only. Never stack them bare heatsink-to-PCB, and set each on an antistatic surface. Keep track of board order and orientation if you plan to reinstall the same boards.
Step 6 — Remove the Control Board
The control board is the miner’s brain — it runs the firmware, talks to the pool over the network, and drives the hashboards. It is smaller than a hashboard and mounts to the chassis or to a hashboard bracket. Disconnect its remaining cables (network, fan headers, any status LED) and remove its screws. Because control-board removal varies most by model, follow the exact steps for your unit rather than forcing anything:
- Antminer S9 SE / S9k control-board disassembly
- Antminer S17 / S17 Pro control-board disassembly
- Antminer S15 / T15 control-board disassembly
Step 7 — Inspect and Clean
With the unit apart, inspect for the usual failure signatures: dust-clogged heatsinks, discolored or bulged capacitors, burnt/browned PCB near power domains, corrosion, and cracked or lifted connectors. Clear dust with the soft brush and compressed air — blow it out of the heatsink fins, don’t grind it deeper. If you’re chasing a dead or under-performing board, this teardown is the point where you move into diagnostics rather than just cleaning.
Reassembly
Reverse the sequence: control board → hashboards → signal cables → power/bus-bar → fans → case. Torque the bus-bar hardware firmly but don’t over-tighten and crack a pad. Reconnect every signal ribbon fully seated, plug fans back into their original headers with correct airflow, and confirm no cable is pinched under the case before you slide the shell on. A single loose bus-bar bolt or half-seated ribbon will show up as a missing or 0-chip board at boot.
Common Mistakes
- Skipping the wrist strap because “it’s just a quick look” — ESD damage is invisible until a domain drops.
- Pulling boards while the bus-bar is still bolted (S17/S19/S21) — cracks solder, strips studs.
- Yanking ribbon cables by the wires instead of the connector body.
- Mixing screw lengths, then cross-threading the aluminum case.
If a board doesn’t come back to life after cleaning and reseating, the fault is deeper than dust — think chip/domain, PIC (on S9/S15/S17-class boards), or PSU. That’s board-level repair territory, not a teardown problem.
Related: Diagnose the underlying fault with the ASIC Fault Finder, source replacement fans, connectors, and hardware from ASIC repair parts, browse full teardown documentation in the manuals library, or let us handle it — start a repair.
