Antminer S9 series repair course - ZMRC

How to properly troubleshoot and repair the Bitmain Antminer S9 series? According to information collected by ZEUS MINING sales from customers, the cost of repairing an S9 hash board in the United States can be as high as $200. Therefore, Antminer S9 hash board maintenance is the most important course for learning ASIC miner repair, explaining in detail the structure of the S9 hash board, the main powerings and signal transmissions. Besides that, here you can also find Antminer V9 hash board repair course, S9j hash board repair course, S9se hash board repair course, etc.

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S9 Hash Board丨Structure & Powering

Antminer S9 hash board repair is the main course for learning ASIC miners. How to repair Antminer S9 hash board? First, we start by learning the structure and power supply process of the S9 hash board. When the S9 hash board cannot work normally, the first step is to check whether its input voltage and DC-DC step-down circuit are abnormal. The S9 hash board repair tutorial video takes you to learn its fault diagnosis.
S9 Hash Board丨PIC Chip

Why cant the S9 control board control the start and stop of the hash board? At this time, it is necessary to check whether the PIC chip is faulty. The PIC chip is a device that stores the frequency information and voltage value of the hash board, and the DC output voltage of the hash board can also be controlled through the PIC chip. This course mainly explains how to troubleshoot the PIC chip and how to correctly burn the PIC program.
S9 Hash Board丨Domain Powering Circuit

S9 hash board has a total of 21 domains, and each domain consists of 3 BM1387 ASIC chips. Powered by the 8.9V generated by the DC control circuit, each domain gets a domain voltage around 0.4V. This course will explain the domain powering process of the S9 hash board, how to measure the domain voltage correctly, and how to troubleshoot the domain with abnormal domain voltage?
S9 Hash Board丨LDO Powering Circuit For Last 5 Voltage Domains

Different versions of the S9 hash board will have different LDO powering circuits for the last 5 domains. The last 5 voltage domains LDO powering circuit can be divided a 14V boost circuit and a 12V power supply input voltage circuit. This tutorial video will lead you to learn the LDO 1.8V and 0.8V powering of the last 5 voltage domains of the S9 hash board and the troubleshooting ideas.
S9 Hash Board丨5 Signal Transmission Directions

Signal abnormality is also one of the main reasons for the failure of the S9 hash board. Remember, the S9 hash board has a total of 5 signals, namely CLK, RI, CO, BO and RST. When the test result of the test fixture reports 0 and the powering is normal, it is necessary to check whether the voltages of the 5 test points are abnormal. This tutorial video will explain in detail the test points of 5 signals and their troubleshooting ideas.
S9 Hash Board丨Temperature Sensing Circuit

Antminer S9 hash board has 2 temperature senses: TEMP (PCB) and TEMP (CHIP). The normal range of the chip temperature is 65℃-125℃, if it exceeds this temperature range, the red light will flash and alarm, and it will enter the shutdown protection mode. If the temperature control circuit fails, the temperature will not be detected, and "0" will be reported in the test result of the test fixture.
S9 hash board丨How to understand the kernel logs?

As professional miner maintenance personnel, if the backstage status page of the miner shows no data or cannot determine the fault, we must know how to view the kernel logs of the miner, so as to further judge the fault of the miner and perform maintenance. In this lesson, we will explain how to correctly interpret the Antminer kernel log.
S9 hash board troubleshooting丨Abnormal input voltage

The input voltage of the Antminer S9 hash board is 12V, which is reduced to 8.9V by the DC-DC circuit to supply power to each voltage domain. If the 12V input voltage is abnormal, the hash board will not work. What conditions will lead to abnormal power input voltage? This video will go detail and demonstrate troubleshooting.
S9 hash board troubleshooting丨DC-DC step-down circuit

How does the DC-DC step-down circuit on the Antminer V4.2 S9 hash board work? When it breaks down, what are the maintenance ideas and methods? This lesson will mainly explain its working principle, main measurement points, and demonstration of troubleshooting methods. Only when the DC buck circuit converts the input voltage 12V to 8.9V output, the hash board can work normally.
S9 hash board troubleshooting丨PIC chip fault

The PIC16F1704 chip is used to store the working information of the hash board, and the output voltage of the DC circuit can be controlled on the S9 hash board. Therefore, when the PIC chip fails, it will cause insufficient power supply to the hash board. Generally, faults caused by PIC chip can be resolved by reprogramming or replacing it with the same type of chip.
S9 hash board troubleshooting丨LDO powering circuit

The LDO powering of Antminer S9 hash board is composed of 1.8V and 0.8V powering, and 0.8V is obtained by dividing the voltage of 1.8V powering through two resistors in series. An abnormal powering of any LDO chip will cause the ASIC chip to fail to operate normally. This video will explain in detail the working principle of the LDO powering circuit, and demonstrate the measurement and repair methods.
S9 hash board troubleshooting丨Boost circuit repair method

The boost circuit on the Antminer S9 hash board is used to boost the 8.9V of the DC-DC circuit to 14V and provide LDO power for the last 5 voltage domains. The voltage of the boost circuit is higher than the normal value, which will easily cause damage to the LDO chips and ASIC chips in the last 5 voltage domains, and the hash board will not work normally.
S9 hash board troubleshooting丨Temperature sensing circuit fault

The temperature sensing circuit consists of TEMP(CHIP) and TEMP(PCB), which are used to transmit the temperature parameters on the hash board to the control board. On the Antminer S9 hash board, the chip temperature is collected by the built-in sensor of the ASIC chip, and the PCB temperature is collected by the temperature sensing chip U89.
S9 hash board troubleshooting丨Report 0 failure

In this lesson, we will explain in detail the repair method of the Antminer S9 hash board that shows 0 ASIC chips. When the detection result of the hash board is 0 ASIC, it is first necessary to check whether the powering of the hash board is normal. If the powering is normal, check whether the RI signal is abnormal, find out the faulty voltage domain, and replace the short-circuited ASIC chip.
S9 hash board troubleshooting丨U88 CT1F level converter chip

U88 CT1F on the Antminer S9 hash board is a level conversion chip for the RI signal. The function of this chip is to convert the voltage, and convert the 3.3V voltage input by the control board through the IO interface 1.8V. All ASIC chips on the S9 hash board can be recognized by the control board only when the chip can work normally.

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