How to disassemble and assemble control board from your ANTMINER S9 SE/S9k?

Start with safety and logs

Power down before opening a miner, label cables before moving boards, and capture logs before repeated reboots erase useful evidence. Record model, firmware, pool, uptime, fan speed, temperature, reject rate, chain count, and the exact error text.

Confirm the fault class

Separate configuration faults from hardware faults first. Pool errors, DNS failures, bad worker names, overheating, weak power, fan faults, and missing hashboards can look similar from the dashboard but require different fixes.

Document the test path

Change one variable at a time and keep the before/after result. Note cable swaps, PSU swaps, firmware changes, pool changes, fan replacements, ambient temperature, and whether the fault follows a hashboard, control board, network, or power source.

When to escalate

Escalate to professional repair when there is a burned smell, melted connector, breaker trip, corrosion, repeated hashboard loss, liquid exposure, or a board-level fault that returns after a basic cable, power, firmware, and airflow check.

After the fix

Run the miner long enough to confirm stable accepted hashrate, fan behavior, chip temperature, reject rate, and pool-side reporting. A dashboard that looks normal for five minutes is not enough evidence for a recurring power, heat, or hashboard fault.

May 28, 2023 · D-Central Technologies · ⏱ 2 min read

Last updated: September 15, 2024

Here’s a step-by-step guide on how to disassemble and assemble the control board from your ANTMINER S9 SE/S9k:

Disassembly

Power down the miner: Always ensure the miner is completely powered down before you begin any hardware adjustments. This will prevent accidental damages from power surges.
Remove the casing: Most miners have a shell or casing that houses the internal components. You will usually need to remove some screws to take off this casing.
Identify the control board: The control board is usually located at the top or side of the miner. It has several cables and connectors leading into it.
Detach the connectors: Carefully remove all the connections leading into the control board. These may include power cables, data cables, and fan connectors. Be gentle to avoid damaging the connectors.
Unscrew the control board: Once all the connections are removed, you can unscrew the control board from the miner’s frame.

Assembly

Attach the control board: Place the control board back onto the miner’s frame and secure it with the screws.
Connect the cables: Reconnect all the cables that you previously detached. Make sure each connector is secure and fits snugly into its socket.
Replace the casing: Once everything is connected, you can replace the miner’s casing. Screw it back in place to secure it.
Power up the miner: Now you can power up your miner. Check the miner’s interface to ensure everything is working correctly.

Remember that handling the control board and other components of a miner requires some degree of technical knowledge. If you are unsure about any of these steps, consider reaching out to a professional or the support team of your miner’s manufacturer.

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Reviewed by D-Central's mining hardware and ASIC repair editorial team for practical accuracy, buyer risk, repair context, and operational assumptions. Verify current hardware price, stock, network difficulty, BTC price, power rate, shipping, tax, firmware, and device condition before buying, hosting, repairing, or retiring mining hardware.

Last reviewed May 24, 2026. D-Central, Laval, Quebec.

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