BTC miner Antminer S19j replacement hash board The original hash board is used to repair and replace a non-working Antminer S19 J. By purchasing a high-quality S19j hash board to replace the damaged hash board, provides the same performance, reducing costs and losses. All S19 j hash boards will be strictly tested before shipment to ensure the normal operation of the hash boards received by customers. Please feel free to ask our account manager for details.