Whatsminer M21S hash board repair tutorial basics

Different from the Whatsminer M20S hash board, the M21S hash board has a total of 66 ASIC chips, which are divided 33 series voltage domains, and the interlayer voltage of each domain is about 0.4V. The core powering of the M21S hashboard ASIC chips mainly includes domain voltage, 1.8V powering and 0.9V powering. The five signals of the M21S hash board are: RST, CLK, CTSI, RXD, TXD.

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