Bitmain Antminer Amlogic A113D C76/C81 Control Board – 4-Pin Square Fan Version

Bitmain S21 / T21 Control Board (Ctrl_C76 / Ctrl_C81 – Amlogic A113D)

The Bitmain S21 / T21 control board (versions Ctrl_C76 and Ctrl_C81) uses the Amlogic A113D chipset and is designed as a replacement for faulty or non-responsive control boards in Antminer S21-series and T21-series miners. It restores proper communication, stability, and operation when the original board fails.

This control board supports the full S19jxp, S21 and T21 lineup and can be configured by flashing the correct firmware for your specific model.

Product Features
• Replacement control board for Antminer S21 and T21 miners
• Amlogic A113D main control chip
• Supports model-specific firmware flashing
• Each board is tested before dispatch
• Designed for stable and reliable mining operation

Compatibility

• Antminer S19jxp
• Antminer S21
• Antminer T21
• Other related S21-series variants that use Ctrl_C76 or Ctrl_C81 boards

⚠️ Important
Make sure your miner uses the C76 or C81 control board version before purchasing. Firmware must be flashed according to the exact miner model for proper operation.

Support
If you are unsure about compatibility or need assistance, please contact our sales team on WhatsApp