Second hand Ebit E9.3 control board High quality used Ebit E9.3 miner control board is used to replace the faulty E9.3 control board; it is used to connect the miner and the hash board for communication. If the control board fails, Ebit E9.3 miners cannot transmit and calculate data normally. Using second-hand control boards for miners to recalculate can improve mining efficiency and reduce losses.