Definition
PCB (printed circuit board) is the rigid, layered board of insulating material and etched copper that physically holds and electrically connects every component in a piece of electronics. In Bitcoin mining, the PCB is the foundation of the hashboard, the control board, and the PSU that together make up an ASIC miner.
Also known as: circuit board, printed board, board.
What a PCB actually is
A PCB starts as a non-conductive substrate (commonly fibreglass-reinforced epoxy known as FR-4) onto which thin layers of copper are laminated and then etched into traces, pads, and planes. The copper routes power and signals between parts, while the insulating layers keep those routes from shorting together. Components are then soldered to the surface pads, which is why “the board” and “the PCB” are used interchangeably when someone talks about repairing a miner.
Simple PCBs have copper on one or two sides. The boards inside mining hardware are far denser. The reference design for an open control board in our research uses a six-layer stackup with copper buried inside the board, controlled-impedance routing for high-speed memory and Ethernet, and components mounted on both sides. That layer count exists because a modern ASIC chip, its DDR memory, and its support circuitry simply cannot be wired on a flat two-sided board.
The PCB inside an ASIC miner
An Antminer-style unit is built from several distinct PCBs. The control board is a small computer PCB carrying the SoC, NAND or eMMC storage, and network interface. The hashboards are large PCBs that each hold dozens of hashing chips wired in series into voltage domains, each fed by its own on-board power-conversion circuitry. The PSU is another PCB that turns wall AC into the 12-15V the hashboards need. Each board is a separate PCB, which is why a single faulty hashboard can be swapped without touching the rest of the machine.
The hashing chips themselves are QFN (quad-flat no-lead) packages soldered flat to the hashboard, with their contacts arranged around the edges of the chip. The densest parts on the control board — the SoC, the DDR memory, and the eMMC storage — use BGA (ball grid array) packages instead, where the connections hide underneath as a grid of solder balls that can only be confirmed with X-ray. Either way, a joint cracked by repeated thermal cycling tends to show up as a cold spot under a thermal camera, which matters enormously when a board fails.
Why a home miner cares about the PCB
Most ASIC failures that look mysterious are really PCB-level problems. Thermal cycling, vibration, and corrosion attack the weakest physical points on the board: cracked BGA solder joints under a chip, cold solder on a tiny clock or signal resistor at a domain boundary, or a damaged copper trace. Any one of these breaks the daisy chain so that every chip downstream goes dark, and the miner reports a board with far fewer chips than it should have. A burst hashboard repair usually comes down to finding and reflowing one bad joint on the PCB rather than replacing anything expensive.
For the home miner running gear in a garage or spare room, this is good news: the PCB is repairable. With an anti-static mat, a multimeter, magnification, and patience, you can probe domain test points, compare readings against a known-good board, and trace a fault to its physical location on the copper. If you are starting out, the small open-hardware Bitaxe class of devices is one of the friendliest ways to get hands-on with a real mining PCB, and our Bitaxe hub walks through that hardware. For the bigger fleet, our ASIC troubleshooting guides cover board-level diagnostics in depth.
PCBs and the case for open hardware
Because the design files for a board, the Gerbers, bill of materials, and pick-and-place data, fully describe how to fabricate it, publishing them is what makes hardware truly open. When a control-board PCB design is released openly, anyone with the files can have the bare board fabricated and assembled, study it, and improve it. That is decentralization expressed in copper: it puts the means of repair and reproduction in your hands instead of a single manufacturer’s. DCENT’s own hardware work builds on the open-source efforts of those who published their boards first, and we treat reproducing an exact, working board as the prerequisite before changing anything. You can explore that philosophy across our open-source hardware lineup.
Related terms: Hashboard, Control board, ASIC chip, Voltage regulator, Heatsink, Open-source mining
In Simple Terms
The circuit board that supports and connects mining chips. The physical foundation of a hashboard.
PCB (printed circuit board) is the rigid, layered board of insulating material and etched copper that physically holds and electrically connects every component in a piece of electronics. In Bitcoin mining, the PCB is the foundation of the hashboard, the control board, and the PSU that together make up an ASIC miner.
Also known as: circuit board, printed board, board.
What a PCB actually is
A PCB starts as a non-conductive substrate (commonly fibreglass-reinforced epoxy known as FR-4) onto which thin layers of copper are laminated and then etched into traces, pads, and planes. The copper routes power and signals between parts, while the insulating layers keep those routes from shorting together. Components are then soldered to the surface pads, which is why "the board" and "the PCB" are used interchangeably when someone talks about repairing a miner.
Simple PCBs have copper on one or two sides. The boards inside mining hardware are far denser. The reference design for an open control board in our research uses a six-layer stackup with copper buried inside the board, controlled-impedance routing for high-speed memory and Ethernet, and components mounted on both sides. That layer count exists because a modern ASIC chip, its DDR memory, and its support circuitry simply cannot be wired on a flat two-sided board.
The PCB inside an ASIC miner
An Antminer-style unit is built from several distinct PCBs. The control board is a small computer PCB carrying the SoC, NAND or eMMC storage, and network interface. The hashboards are large PCBs that each hold dozens of hashing chips wired in series into voltage domains, each fed by its own on-board power-conversion circuitry. The PSU is another PCB that turns wall AC into the 12-15V the hashboards need. Each board is a separate PCB, which is why a single faulty hashboard can be swapped without touching the rest of the machine.
The hashing chips themselves are QFN (quad-flat no-lead) packages soldered flat to the hashboard, with their contacts arranged around the edges of the chip. The densest parts on the control board — the SoC, the DDR memory, and the eMMC storage — use BGA (ball grid array) packages instead, where the connections hide underneath as a grid of solder balls that can only be confirmed with X-ray. Either way, a joint cracked by repeated thermal cycling tends to show up as a cold spot under a thermal camera, which matters enormously when a board fails.
Why a home miner cares about the PCB
Most ASIC failures that look mysterious are really PCB-level problems. Thermal cycling, vibration, and corrosion attack the weakest physical points on the board: cracked BGA solder joints under a chip, cold solder on a tiny clock or signal resistor at a domain boundary, or a damaged copper trace. Any one of these breaks the daisy chain so that every chip downstream goes dark, and the miner reports a board with far fewer chips than it should have. A burst hashboard repair usually comes down to finding and reflowing one bad joint on the PCB rather than replacing anything expensive.
For the home miner running gear in a garage or spare room, this is good news: the PCB is repairable. With an anti-static mat, a multimeter, magnification, and patience, you can probe domain test points, compare readings against a known-good board, and trace a fault to its physical location on the copper. If you are starting out, the small open-hardware Bitaxe class of devices is one of the friendliest ways to get hands-on with a real mining PCB, and our Bitaxe hub walks through that hardware. For the bigger fleet, our ASIC troubleshooting guides cover board-level diagnostics in depth.
PCBs and the case for open hardware
Because the design files for a board, the Gerbers, bill of materials, and pick-and-place data, fully describe how to fabricate it, publishing them is what makes hardware truly open. When a control-board PCB design is released openly, anyone with the files can have the bare board fabricated and assembled, study it, and improve it. That is decentralization expressed in copper: it puts the means of repair and reproduction in your hands instead of a single manufacturer's. DCENT's own hardware work builds on the open-source efforts of those who published their boards first, and we treat reproducing an exact, working board as the prerequisite before changing anything. You can explore that philosophy across our open-source hardware lineup.
Related terms: Hashboard, Control board, ASIC chip, Voltage regulator, Heatsink, Open-source mining