Welcome to Peak Asic's S19J Pro Hashboard repair guide! We specialize in providing expert Antminer hashboard repairs, but we understand that some of you might want to try repairing your devices yourself. To support your efforts, we've created this comprehensive guide to help you through the process. Follow the steps below, and feel free to reach out to us if you need professional assistance or would like to send in miners for repair.
I. Maintenance Platform / Tool / Equipment Preparation Requirements
1. **Platform Requirements:**
- Rubber blanket repair workbench (grounded)
- Anti-static wrist strap (grounded)
2. **Equipment Requirements:**
- Constant temperature soldering iron (350℃ - 380℃) with a pointed tip for small components
- Portable desoldering gun and BGA repair station for chip/BGA work
- Fluke 15B+ multimeter with steel pin and heat-shrinkable T bush for measurements
- Oscilloscope, network cable
3. **Test Tools Requirements:**
- APW12 power supply with APW12_12V-15V_V1.2 and power adapter cable
- 4AWG copper wires (length ≤ 60cm) to connect the power supply to the hash board
- V2.2010 control board test fixture with discharge resistors (25 ohms, ≥100W cement resistor)
4. **Auxiliary Materials/Tools:**
- Solder paste, flux, board washing water with absolute alcohol
- Thermal grease for chip surface post-repair
- Tin tool steel sheet, tin removal wire, solder ball (0.4mm diameter recommended)
- RS232/TTL adapter board (3.3V)
- Self-made short-circuit probe
5. **Common Spare Materials:**
- 0402 resistors (0R, 51R, 10K, 4.7K)
- 0402 capacitors (0.1uF, 1uF)
II. Maintenance Requirements
1. **Chip Replacement:**
- Ensure no obvious deformation of PCB
- Check for open and short circuits in replaced and surrounding parts
2. **Operator Requirements:**
- Must have specific electronic knowledge and over one year of maintenance experience
- Proficient in BGA/QFN/LGA package soldering
3. **Testing Post-Repair:**
- Hash board must be tested twice to ensure functionality
4. **Tool and Fixture Check:**
- Ensure tools and test fixtures work normally
- Confirm maintenance station, software parameters, and fixture versions
5. **Chip Function Testing:**
- Chips must be tested first, followed by functional testing
- Ensure small heat sink is properly welded
- Apply thermal grease evenly on chip surface before installing large heat sink
6. **Cooling Requirements:**
- Use 4 cooling fans to assist in heat dissipation, maintaining full speed
7. **Powering Hash Board:**
- Connect negative copper wire, then positive, and finally signal cable when powering on
- Reverse order when removing
- Cool repaired hash board before testing
8. **Chip Replacement:**
- Ensure pins are tinned before soldering to PCB
### III. Test Fixture Making and Considerations
1. **Test Fixture Update:**
- Use SD card to reflash the test fixture control board FPGA
- Update procedure involves copying files to SD card, inserting, and powering on
2. **SD Testing Card:**
- Create according to the requirements for single-sided and double-sided heat sink inspection
IV. Principle Overview
1. **Hash Board Structure:**
- Composed of 126 BM1362 chips divided into 42 groups (domains)
- Operating voltage is 0.32V, powered by boost circuit and LDOs
2. **Boost Circuit:**
- Transfers 15V to 20V
3. **Signal Trend:**
- Various signal flows including CLK, TX, RX, BO, and RST
4. **Whole Miner Architecture:**
- Includes 3 hash boards, control board, power supply, and cooling fans
V. Common Faults and Troubleshooting Steps
1. **Phenomenon 1: Single hash board test detection chip is 0**
- Check power output, voltage domain output, PIC circuit, boost circuit output, LDO, and PLL outputs, and chip signal outputs
2. **Phenomenon 2: Single hash board detection chip is not complete**
- Measure domain and boost circuit voltages, check chip signals, and use dichotomy method to locate faulty chips
3. **Phenomenon 3: Single hash board Pattern NG**
- Replace chips with significant response rate differences
4. **Phenomenon 4: PT2 function test serial port does not stop**
- Short-circuit method to find faulty chip
5. **Phenomenon 5: PT2 function test always reports a certain chip NG**
- Inspect chip capacitors and resistors for damage
VI. Control Board Problems
1. **Whole miner does not work:**
- Check voltage outputs, welding of DDR/CPU, and try reprogramming flash
2. **Cannot find IP:**
- Check network port, transformer, and CPU welding
3. **Cannot upgrade:**
- Check network port, transformer, and CPU welding
4. **Fails to load hash board:**
- Check cable connections and control board components
VII. Failure Phenomenon of Whole Miner
1. **Fan display abnormal:**
- Check fan function and connections
2. **Less chain:**
- Check cable connections and control board components
3. **Abnormal temperature:**
- Check for high temperature, monitor PCB, and follow test log prompts