Antminer Schematics
Antminer hashboard and control board schematics. Circuit diagrams, block diagrams, and pinout references for Bitmain mining hardware.
Overview
This page collects publicly available schematics, block diagrams, and pinout references for Bitmain Antminer hardware. These resources are invaluable for hashboard repair, component identification, and understanding circuit topology.
Disclaimer: AZIC does not host proprietary schematics. We link to publicly available resources shared by the repair community. Some schematics are official Bitmain releases; others are community reverse-engineered. Always verify accuracy before relying on any schematic for repair work.
Schematic Availability by Model
| Model | Hashboard | Control Board | Block Diagram | Status |
|---|---|---|---|---|
| S21 | Partial | Limited | Available | Community |
| S21 Pro | Partial | Limited | Available | Community |
| S19 XP | Available | Available | Available | Widely shared |
| S19 Pro | Available | Available | Available | Widely shared |
| S19j Pro | Available | Available | Available | Widely shared |
| S19k Pro | Partial | Available | Available | Community |
| S17 / S17 Pro | Available | Available | Available | Complete |
| S9 / S9i | Available | Available | Available | Complete |
| L7 | Partial | Available | Available | Community |
| L3+ | Available | Available | Available | Complete |
Newer models have less public documentation. Bitmain does not officially release schematics. Community members reverse-engineer and share them over time. S9 and S17 schematics are most complete due to their long market presence.
S21 Series
Block Diagram
The S21 hashboard uses BM1368 ASIC chips organized in 12 voltage domains:
- Input: 12V DC from PSU
- Buck converters: 12 domains, each powering 10-11 BM1368 chips at ~0.30V
- Signal chain: CLK, CI/CO (command in/out), RI/RO (result in/out)
- I/O voltage: 1.8V for chip communication
- Temperature sensors: NTC thermistors on board
- EEPROM: Board identification and calibration data
Available Resources
Community-sourced partial schematics and voltage domain maps are shared in mining repair forums and Telegram groups. Search for:
- "S21 hashboard voltage domain diagram"
- "BM1368 reference circuit"
- "S21 control board pinout"
S19 Series
The S19 family has the most complete publicly available documentation.
S19 Pro / S19j Pro Hashboard
Key circuit sections:
| Section | Description | Components |
|---|---|---|
| Power input | 12V from PSU connector | Input filter caps, TVS diodes |
| Buck converters | Per-domain voltage regulation | MP2313 or similar, inductors, caps |
| ASIC chain | BM1398/BM1397 chip array | ASIC chips, decoupling caps |
| Signal distribution | CLK, CI/CO, RI/RO routing | Level shifters, termination resistors |
| Temperature | NTC thermistor network | 10K NTC, voltage divider |
| EEPROM | Board ID storage | AT24C02 at I2C 0x50 |
| PIC | I2C bridge controller | PIC16F1704 at I2C 0x20-0x27 |
S19 Pro Control Board
| Section | Description |
|---|---|
| SoC | Xilinx Zynq or similar FPGA/SoC |
| RAM | DDR3/DDR4 SDRAM |
| NAND | Boot and firmware storage |
| Ethernet | 10/100 Mbps PHY |
| Fan control | PWM fan headers (4-pin) |
| Hashboard connectors | Data + power for 3 hashboards |
S17 Series
The S17 has comprehensive schematics available due to its widespread use and repair challenges.
Known Issues in S17 Schematics
- Power stage failures are the most common S17 issue
- Buck converter components are undersized for long-term reliability
- Thermal paste quality from factory is often poor
- Heatsink attachment points are prone to warping
Available S17 Documentation
- Full hashboard schematic (community verified)
- Control board schematic with FPGA pinout
- Power stage component values and replacements
- Test point locations for voltage domain debugging
S9 Series
The S9 is the most thoroughly documented Antminer model:
S9 Hashboard
- 63 x BM1387 ASIC chips per board
- 18 voltage domains (3 or 4 chips per domain)
- Simple buck converter topology
- Well-documented signal chain
S9 Control Board (Xilinx Zynq)
- Complete schematic available
- UART pinout documented
- NAND flash layout known
- Network controller (RTL8211E) reference
L-Series (Litecoin)
L7
- BM1485 Scrypt ASIC chips
- Similar topology to S19 series
- Partial schematics from community
L3+
- BM1485 chips (older revision)
- Complete schematics available
- Simple, well-understood design
Where to Find Schematics
Schematics circulate in several community channels. AZIC does not host copyrighted documents but can point you to the repair community.
| Source | Type | Notes |
|---|---|---|
| Mining repair forums | Community-shared | Largest collection of reverse-engineered schematics |
| Telegram repair groups | Community-shared | Real-time sharing, search group message history |
| Chinese repair channels | Official + community | Some Bitmain service center documents leak here |
| ZeusBTC | Community | Some schematics in their repair guides |
| GitHub | Community | Occasional schematic uploads |
Using Schematics for Repair
When working with schematics:
- Cross-reference with the physical board — component placement may differ between hardware revisions
- Verify voltage values with a multimeter before trusting schematic values
- Check component markings — replacement parts must match exact specifications
- Note hardware revision — the same model (e.g., S19 Pro) may have multiple PCB revisions with different component layouts
Related Resources
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Serial terminal applications for ASIC miner debugging. UART communication tools for control board diagnostics, firmware recovery, and low-level troubleshooting.
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