When the Avalon 921 hash board single board test report shows "asic count = 0". Generally, first, test the ground value of the main power supply on the hash board. Bearing in mind the standard value of the land value, identifying the test location and test object can complete the miner inspection faster.
Details:
https://www.zeusbtc.com/articles/information/4164-avalon-921-hash-board-repair-guide
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