Replacement hashboard for the Antminer S21 151TH (also compatible with other TH models), genuine Bitmain part. Used to repair a miner with a faulty board instead of replacing the entire unit.
The S21 has three hashboards which together deliver 151 to 200 TH/s at ~17.8 J/TH, corresponding to approximately 50 TH/s per board.
Before installation, check the firmware and PSU. After replacement, run a self-test via the miner interface.