Welcome to Peak Asic's S17 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.
**Content:** This guide describes troubleshooting methods for various faults in the S17, explaining how to use test tools for accurate diagnostics.
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## Table of Contents
1. Service Tools
2. Component Structure of the Computing Board
3. Signal Transmission Circuit
4. Power Supply Circuit
5. Single Board Test Troubleshooting Examples
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## 1. Service Tools
- **General Electric Screwdriver**
- **Multimeter, Tweezers, V9-v1.2 Test Fixture, S17 Chassis with Power Supply**
- **Heat Gun:** Welding temperature is 260±2 degrees (actual temperature).
- **Thermostat Soldering Iron:** Welding temperature is 300-350 degrees.
- **Environment-friendly Scaling Powder:** Lead-free low-temperature solder stick (melting point 150 degrees), anhydrous alcohol, and water for cleaning the panel.
- **OM550 Low Temperature Solder Paste**
- **BM1397AE Tin Planting Steel Mesh Fixture**
- **Cooling Fan**
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## 2. Component Structure of the Computing Board
### Power Supply
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## 3. Signal Transmission Circuit
1. **Signal Transmission Channel:**
The signals (CLK, RST, BO, CO) are transmitted sequentially from the first chip to the last (48th) chip. The RI signal is transmitted in reverse, from the 48th chip back to the first chip.
2. **Signal Test Point Identification and Arrangement:**
The computing board consists of 48 chips and 12 voltage domains.
**Voltage Domain Distribution:**
- There are 12 voltage domains.
- Each domain spans 4 chips.
3. **Power Circuit:**
- The power supply voltage for each board is 18.5V (S17 fixture test voltage output).
- Each pair of voltage domains has a voltage of 1.55V.
### Detailed Voltage Information:
- **18.5V Power Supply:** For the entire board.
- **1.55V per Voltage Domain Pair:** Ensuring correct power distribution across the board.
- **1.8V LDO (Low Dropout Regulator):** Each voltage domain has one LDO supplying 1.8V to the chips.
- **0.8V LDO:** Every two chips within each voltage domain have a 0.8V LDO supplying power.
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## 4. Troubleshooting Case Studies
### Single Board Test Example
**Issue: ASIC=0**
- **Analysis:**
1. Check the connection between the fixture cable and the computing board.
2. For the S17 computing board, J6-J7 should show 18.5V during the fixture test.
3. Verify the voltage across the 12 voltage domains and ensure the boost circuit is normal:
- If no voltage is present, check the Q7, Q8, Q9, Q11 pins for normal working voltage (0V).
- Ensure Q10's pin 1 has a high level of 3.3V.
- If Q10 lacks 3.3V, the U3-PIC might lack firmware or power.
**Measuring the RI Signal:**
- Measure the RI signal from the last chip back to the first.
- Check if the RI signal has a voltage of 1.8V at each chip.
- If the RI signal is absent, first verify the 1.8V power supply.
- Inspect the LDO's pin 5 for a 1.8V output. If absent, the LDO might be faulty.
- Measure the resistance to ground at the test point after power is off, comparing with a known good board.
**Issue: ASIC=7**
- **Analysis:**
- If 7 chips are found, the RI signal is normal.
- Measure U198-CLK-RST-CO voltages on the 7th chip to ensure normal power supply.
- For CLK absence (0.8V), inspect the 0.8V power supply circuit:
- The 0.8V LDO provides power similarly to the 1.8V LDO.
- Check for a 0.8V output. If absent, verify the 0.8V LDO supply voltage (about 3.2V).
- Inspect for cold solder joints or shorts.
- If resistance is normal, the chip may be damaged.
**General Steps:**
1. Confirm power supply voltages.
2. Verify signal integrity across chips.
3. Inspect LDO outputs for consistency.
4. Measure resistance and compare with a functional board.
5. Replace faulty components as identified.
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For more detailed diagrams and specific component locations, please refer to the provided schematics and board layouts included in the full guide.