ASIC Repair Basics: Antminer L3+ Common Faults and Solutions

Table of Contents

The Antminer L3+ Hash Board is a highly advanced device specifically designed for ASIC miners. It includes 12 individual voltage domains, each of which houses 6 BM1485 chips. This brings the total number of chips on board to 72 BM1485 chips, making it an incredibly powerful and efficient mining rig. The chip has a built-in step-down diode to improve performance, and its pin configuration determines the function of this diode. Additionally, the L3+ is equipped with a 25M single crystal oscillator which transmits data from one end to the other via these chips in series.

Analysis of Key Points: Signal Paths & Test Points

The signal paths are routed from the clock crystal oscillator (Y1) and travel to each chip in sequence, with a voltage level either at 0.9V during standby or 1.8V during operation. The Reset signal is sent from pin 15 of the IO port to each chip, again with a voltage level either at 0V when no IO line is inserted or 1.8V when operating. Additionally, every individual chip on the hash board has its own dedicated heatsink for optimal cooling and stability; this should be replaced with black thermal conductive glue upon repair or replacement of any chips within the board.

The test points between each chip provide invaluable information for diagnosing faults within the signal chain; they contain signals such as RST (Reset), B0 (Bi-directional Bus 0), RI (Receive Input) or RX (Receive Output), C0 (Transmit Input) or TX (Transmit Output) and CLK (clock). Each of these signals is routed through the crystal oscillator Y1, providing 25M clock pulses at specific voltage levels depending on their respective functions; such as 0V in standby mode or 1.8V while operating. This helps to ensure reliable performance and efficient debugging by providing more detailed information about each signal’s current state at any given time without having to disconnect any lines; saving both time and hassle when it comes to repairs or replacements. Furthermore, there are also additional components involved in routing the signal flow on the hash board, including CORE voltage, LDO-1.8OV, PLL-0.9V and others which have their own integral roles in ensuring smooth operation across all chips connected to it.

Understanding the IO Port and its Pin Definitions

Understanding the IO Port and its Pin Definitions is essential for troubleshooting any issues related to a hash board. The pin definitions of the IO port are divided into two categories – GND, I2C bus of DC-DC PIC, identification signal, PIC address signal, TXD & RXD channels and RST reset signal as well as D3V3 power supply. Each pin serves an important purpose in order to ensure that the hash board operates properly. For example, pins 1-4 are used for communication between the control board and PIC while pins 5-8 are used for controlling operating status on the hashboard. Additionally, pins 11-12 provide channels of hash rate at 3.3V end of the hashboard while pin 15 provides a 1.8V RST reset signal after being divided by resistors and finally pin 16 provides 3.3V power supply for the operation of PICs on the hashboard.

The connection between the control board, PIC and hash board is an important part of the overall process. Pin 5 (PLUG0) is used as the identification signal of the arithmetic board, which pulls a 10K resistance from the arithmetic board to 3.3V. Pins 6, 7, 8 (A2, A1, A0) are used as PIC address signals while pins 11 and 12 (TXD and RXD) are channels for hash rate at 3.3V end of hash boards that become TX(CO) and RX(RI). Additionally pin 15 (RST) becomes 1.8V RST reset signal after being divided by resistors while pin 16 (D3V3) provides 3.3V power supply for the hash board mainly to provide working voltage for PICs. The 14V boost circuit boosts DC-DC from 10-10.4v to 14v using U111 RT8537 switching power supply with L1 generating switching signals while D100 charges/discharges C1072 positive pole resulting in 14v output voltage. Meanwhile temperature sensing circuit collects BM1485 built-in temperature sensor through pin 6 & 7 before returning back to FPGA on control board via BZ2 and VDD connections respectively.

By understanding the IO port and its pin definitions, it is possible to diagnose and repair common errors that may arise with a miner. For example, a malfunctioning hash board can be identified by checking whether the TXD and RXD are functional or not. In some cases, it may be necessary to replace the PIC on the board in order to restore functionality. Additionally, understanding the 14V boost circuit and its components allows you to troubleshoot any issues that may arise with voltage fluctuations.

Testing Voltage Levels for Each Chip, CORE voltage, LDO-1.8OV, PLL-0.9V and other Voltages

Testing voltage levels for each chip, CORE voltage, LDO-1.8OV, PLL-0.9V and other voltages is a critical component of ensuring that ASIC mining hardware runs at peak performance and remains error free. It is important to make sure all IO port pins are connected correctly and that the appropriate power supply voltages are being provided to each individual component on the hash board. For example, the CORE voltage should be 0.8V, while the LDO-1.8O should be 1.8V and the PLL-09V should be 0.9V – any discrepancies can result in an unstable or inoperable board.

In order to make sure that all components on a hash board are receiving the correct power supply voltages, it is necessary to use a test tool that displays information such as computing capability, temperature sensitivity and voltage levels for each pin on the IO port on the board. In addition to checking if all pins are connected correctly, it is also important to check if any of them are short circuited or open circuited in order to prevent potential damages caused by incorrect wiring or faulty equipment due to not adhering to correct voltage levels when testing them.

Once these tests have been completed successfully, it is then possible to begin testing each individual chip on a hash board individually with a multimeter in order ensure they are operating within their specified tolerances. This allows you not only diagnose problems quickly but also identify any areas where maintenance might be needed so that your miner can continue running optimally over time without any unexpected issues arising from poor power supply voltages.

Identifying Abnormal Voltage Variations to Determine Fault Locations

Identifying abnormal voltage variations is a key part of troubleshooting and diagnosing any issues related to hash boards. By understanding the various voltages that are present on each pin of the IO port, it is possible to detect any irregularities or inconsistencies in order to pinpoint the exact location of faults. This can be especially useful when trying to diagnose problems such as short circuiting or open circuiting due to incorrect wiring or faulty equipment. Additionally, by testing for these voltage variations it is also possible to determine if components are functioning properly and identify potential areas for improvement in order to ensure optimal performance from the board.

Overview of Voltage Testing for Chips

Voltage testing for chips is an essential part of ensuring the optimal performance and reliability of electronic devices. It involves measuring the voltage of each chip to ensure that it is always within an acceptable range and does not experience any abnormalities. This helps prevent malfunctions due to incorrect voltages, as well as improving the overall functionality of the device.

The process usually begins by checking the IO voltage, which determines the voltage of each test point on the chip. This can provide important information regarding any discrepancies between expected values and actual values, helping to identify possible problems before they become more serious. From there, all other voltage domains must be measured in order to ensure that all components are functioning correctly. If any abnormal readings are observed, further investigation should be done to figure out what could be causing them; this could include issues with power supply circuitry, poor thermal management or faulty components.

In order to properly diagnose any issues related to incorrect voltages, it is important that a thorough examination is made of both internal and external factors such as grounding resistance values and adequate airflow for ventilation purposes. If a problem is found with one or more components, care must be taken when replacing them in order to avoid any potential damage caused by incorrect wiring or faulty equipment. Additionally, thermally conductive adhesive can be used when replacing parts in order to ensure good heat transfer from the chip, making sure that it operates at optimal levels over time. Following these steps will help reduce malfunctions caused by incorrect voltages and secure reliable operation of electronic devices for a long period of time.

Causes of Abnormal VDD1.8 Voltage

Causes of Abnormal VDD1.8 Voltage can vary, and can be attributed to a number of different issues. Poor power supply circuitry is one possible cause; incorrect components or connections within the power supply could lead to it not producing enough voltage for the chip, resulting in the VDD1.8 Voltage value being out of range. Poor thermal management can also be an issue; if the chip overheats due to inadequate cooling, it can cause incorrect readings which may affect the VDD1.8 Voltage value. Faulty components are also common culprits; they often lead to false readings which could result in various malfunctions. Grounding resistance values must also be taken into account during troubleshooting, as incorrect values can lead to inaccurate readings and potential malfunctions in other parts of the device. Finally, adequate airflow should be checked for ventilation purposes; inadequate airflow cooling the device could lead to excessive heat production, resulting in abnormal voltages on certain chips. It is thus essential for maintenance personnel to properly evaluate each of these factors in order to identify any issues with VDD1.8 Voltage levels and take appropriate action before moving on with other maintenance tasks.

Low Hash Rate – Reasons and Solutions

Low hash rate is a common issue among cryptocurrency miners, as it refers to the number of hashes their computer can produce per second in order to be accepted by the blockchain network. This problem can arise due to several factors such as hardware limitations, software configuration issues and more. Fortunately, there are various solutions available that allow miners to optimize their hardware settings and improve cooling systems in order to boost hash rate performance. Additionally, they can also adjust software parameters and tune algorithms for further optimization. With these strategies in place, miners should be able to increase their hash rates significantly and get back on track with their mining activities.

A Certain Chip is NG – What to Do

When a certain chip is identified as being non-functional, or NG, it is important to take steps in order to troubleshoot the issue and diagnose the root cause of the problem. The first step should always be to inspect any available data that could possibly provide insight into what went wrong. This includes performing a visual inspection for physical damage, checking any wiring or connections for improper configurations, and verifying that power supply circuitry is operating correctly with no shorts or surges present. If there are no visible signs of physical damage then it may be necessary to initiate a system-level diagnostic test in order to further assess the malfunctioning chip and its performance.

After diagnosing the issue with the defective component, it may become necessary for qualified technicians to identify and replace any faulty components. This process will involve conducting a comprehensive visual inspection in order to locate any damaged areas on the chip itself. Once any defects have been identified then a detailed analysis of these issues should be conducted in order to comprehend their impact on overall performance. Depending on the severity of these problems, it may also be necessary to isolate and replace other related hardware components such as capacitors and resistors in order for them to operate correctly again.

In addition, thorough testing must also be carried out on peripheral devices connected to the affected chip such as logic gates and transistors. This will not only help pinpoint potential sources of error but also give additional evidence concerning its functionality before replacing it with new components. Additionally, due diligence must be exercised when reassembling all parts after maintenance tasks have been completed; careful reassembly is required in order for everything to go back together properly for optimal performance.

Finally, values must also be taken into account during troubleshooting as incorrect values can lead to inaccurate readings and potential malfunctions in other parts of the device; adequate airflow should likewise be checked for ventilation purposes as inadequate cooling could lead to excessive heat production resulting in abnormal voltages on certain chips. All these considerations should allow maintenance personnel to properly evaluate each factor involved when dealing with non-functional chips; thus enabling them take appropriate measures before moving on with other maintenance tasks.

Maintenance Notice – Essential Tips & Tricks

It is important to take precautions and read related documentation before performing any maintenance or upgrades on your components. Noticing any error messages that may occur during the process can also help identify potential issues before they become more serious. Cleaning the hardware regularly by removing dust particles can help reduce the risk of overheating and other performance issues, while staying up-to-date with software updates provides bug fixes and security patches which are necessary for optimal performance.

When conducting maintenance tasks, it is also important to make sure that all connections are properly secured and that cables are not tangled up or placed in a way that could cause damage over time. Furthermore, checking for adequate airflow around the affected electronics will also be beneficial when it comes to cooling down the system, as well as avoiding abnormal voltages on certain chips. In addition, modern technologies like AI can provide additional insight into complex diagnostic processes by helping identify problems quickly and accurately through data analysis; this makes maintenance more effective and efficient for technicians in diagnosing malfunctions without having to rely solely on manual methods. Finally, taking values into account during troubleshooting can help make sure readings are accurate, which allows technicians to identify underlying problems more easily when dealing with non-functional chips.

Troubleshooting Tips for Repairing Antminer L3+ Hash Boards

When it comes to troubleshooting and repairing Antminer L3+ hash boards, there are a few key tips that can help ensure successful diagnosis and repair. Before beginning the process, it is important to check all of the chips on the board for any signs of damage or failure such as missing pins or incorrect chip operation. Additionally, if any chips need to be replaced, it is essential to apply a thin layer of black conductive thermal glue to each one in order to ensure proper heat transfer and cooling efficiency. Furthermore, checking all signal paths with test points should also be done; these include signals like RST (Reset), B0 (Bi-directional Bus 0), RI (Receive Input) or RX (Receive Output), C0 (Transmit Input) or TX (Transmit Output) and CLK (clock). All of these signals should be routed through the crystal oscillator Y1 and will have specific voltage levels depending on their respective functions; such as 0V when no IO line is inserted or 1.8V while operating. After this step has been completed, technicians should then inspect all wires within the board by gently tugging on them and recheck connections whenever any repairs are made. Finally, modern technological advances like AI can provide additional insight into complex diagnostic processes through data analysis; allowing maintenance personnel to quickly identify problems without having to rely solely on manual methods. Following these steps will give technicians an advantage when it comes to successfully diagnosing malfunctions and repairing Antminer L3+ hash boards.


Maintaining and troubleshooting mining machines requires a deep understanding of the electrical components, their functions, and how they interact with one another to ensure optimal performance. By following these steps for maintenance and troubleshooting common problems such as low hashing rate or NG chips, you can guarantee that your machine is running at its peak efficiency. It’s important to remember that paying close attention during each step of the process will help prevent any further damage from occurring and save time in repairs. With careful analysis of all aspects involved in working with miners, anyone should be able to maintain their machine without too much difficulty.

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Disclaimer: The information provided on this blog is for informational purposes only and should not be taken as any form of advice.

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