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Precautions and Best Practices for Miner and Power Supply Connections

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.

· D-Central Technologies · ⏱ 2 min read

Last updated:

When connecting the power supply to the miner, there are three connection points to pay attention to:

  1. Wire connection with 4-pin or 6-pin connector
  2. Conductive copper plug and socket connection
  3. Fixed conductive copper bar

CAUTION: It’s crucial to prevent poor contact, reverse connection of positive and negative poles, etc., which may cause board loss, core loss, burnout, and other failures of the computing board.

Wire connection with 4-pin or 6-pin connector:

  1. Pay attention to the direction of the pins and the base, and do not insert them backwards. The correct direction can be judged by the shape of the buckle, pin, and base.

    Components:

    A: Snap

    B: Trapezoidal pin

    C: Square pin

  2. When carrying the miner, it’s strictly forbidden to hold the wire directly, as this can cause the connector to become loose or deformed.
  3. The hash board generally requires 3 sets of 6-PIN plugs, which must be fully plugged in.

Conductive copper plug and socket connection:

  1. Pay attention to whether the copper plug is completely embedded in the card slot. Due to handling, vibration, improper installation, etc., the copper plug may not be completely inserted into the card slot. In this case, you need to press or reinstall to make the copper plug fully fit into the card slot.
  2. The copper plug lock must be installed correctly.
  3. After many times of disassembly and assembly of the copper plug, poor contact with the base may occur. Use needle-nose pliers to adjust the slot gap to ensure that the copper plug is in full contact with the slot.

Fixed conductive copper bar:

Ensure that each screw is fastened, and there are no missing installations, non-fitting, etc.

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Editorial review and limitations

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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