This video is a quick tutorial to start working with a test fixture on an Antminer S9 hashboard. In this video, we're trying to suggest an overview of how the test fixture works and how to troubleshoot and repair them. Notice that the hashboard in this tutorial has been used in a mineral oil cooling system and these oils expose corrosion effects on conductors, hence the solder joints don't have enough mechanical strength and may fall apart when we are using a heatgun straightly from beneath. That makes us use a preheater and expose the heat from the upperside.

"This video is the English version of the previous video"

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