Repairing a damaged boost circuit on an ASIC miner's hash board using an MT3608 28V adjustable boost module

This module can output up to 28V, making it suitable for replacing boost circuits up to 28V on Antminer and Whatsminer computing boards. "VOUT+" and "VOUT-" are the positive and negative terminals of the module's output, respectively, while "VIN+" and "VIN-" are the positive and negative terminals of the module's input. It also includes a boost inductor, diode, boost chip, voltage regulator, and an output voltage adjustment knob. 

Next, I will explain how to use this adjustable 28V boost module to repair the 23V boost circuit on the L7 hash board.

1. First, locate and remove the boost chip from the original circuit.

2. Next, find the input and output terminals of the circuit: the two capacitors above are the input terminals, while capacitor C70 is the output terminal.

3. Now, power on the hash board and use a multimeter in DC voltage mode to check the polarity of the input capacitor. If the reading is negative, it indicates that the current probe is connected to the negative terminal, and the other end is the positive terminal. After determining the polarity, connect the positive terminal to "VIN+" of the boost module and the negative terminal to "VIN-".

4. Next, measure the polarity of the output capacitor C70 to confirm its positive and negative terminals. Similarly, connect the positive terminal to the module's "VOUT+" and the negative terminal to "VOUT-".

5. After completing the connection, wait for the circuit to cool down before performing any necessary cleaning.

6. Power on the hash board again and adjust the voltage. First, measure the current output voltage, which is approximately 15V. The normal boost voltage for this hash board should be 23V, therefore the voltage needs to be adjusted using the voltage regulator on the module. Use a thin tool to rotate the knob counterclockwise to increase the voltage. After adjustment, measure again to confirm that the voltage has stabilized at around 23V. Note: Rotating clockwise decreases the output voltage, and rotating counterclockwise increases the output voltage. Finally, fix the boost module in an open and insulated location on the board to avoid short circuits.

This module integrates an MT3608 2-amp boost converter, which can reduce the input voltage to 2V and boost the output voltage to a maximum of 28V. The MT3608 features automatic switching to Pulse Frequency Modulation (PFMO) mode under light load.

Furthermore, the module includes undervoltage lockout, current limiting, and overheat protection. It is equipped with a multi-turn trimmer potentiometer for adjusting the output voltage. With a 25-turn adjustment range, the module's output voltage can be easily adjusted to the desired value.

How to use 28V adjustable boost module to repair the damaged boost circuit on ASIC miner hashboard?

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