Antminer S9 hash board troubleshooting for the DC buck 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.

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