Antminer S21 T21 Control Board Amlogic C76 A113D
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Antminer S21 T21 Control Board | Brand New OEM Replacement
The Antminer S21 T21 Control Board is the primary logic controller for Bitmain's latest SHA256 ASIC miners. Built on the Amlogic A113D processor and designated Ctrl_C76, this control board manages all communication between your power supply, hashboards, and cooling infrastructure. When your S21 or T21 miner cannot display its IP address, fails to access the backend interface, or doesn't detect attached hashboards, a control board replacement typically restores full functionality.
The control board is the "brain" of your ASIC miner, handling network connectivity, hashboard status monitoring, thermal management, and firmware execution. Unlike hashboard failures that affect only one section of your mining output, control board failure disables the entire miner. Our replacement boards are brand new, original-specification units sourced directly from Bitmain's manufacturing partners.
Ctrl_C76 Specification & Amlogic A113D Architecture
The control board revision Ctrl_C76 integrates the Amlogic A113D main processor, which runs Bitmain's proprietary mining firmware. This system-on-chip handles real-time hashing algorithm execution, power state transitions, and network protocol management. The board includes a full suite of connectivity: Ethernet port for network integration, micro SD slot for firmware updates, and reset button for emergency recovery.
Antminer S21 and T21 Compatibility
This control board is fully compatible with both Antminer S21 (SHA256 for Bitcoin) and T21 miners. Do not confuse this board with earlier S19 or T19 variants — the A113D architecture is exclusive to the S21/T21 generation. After installation, the S21 or T21 boots to Bitmain's standard firmware interface within 60 seconds of power-on and acquires a network address via DHCP (or static IP if previously configured). Access the miner's web interface to verify hashboard detection and confirm the device boots cleanly.
S21 T21 Firmware & Mining Pool Compatibility
The control board ships with factory firmware installed. No user re-flashing is required for standard operation. If your S21 or T21 is running a custom firmware variant, you may need to update the micro SD card after control board replacement. Standard Bitmain firmware supports all mining pools and network configurations.
Specifications
| Specification | Details |
|---|---|
| Board Revision | Ctrl_C76 |
| Main Processor | Amlogic A113D |
| Compatible Models | Antminer S21, Antminer T21 |
| Connectivity | Ethernet, micro SD slot, reset button |
| Condition | Brand new, original specification |
| Common Repair Scenarios | No IP address visibility, backend inaccessible, hashboard detection failure |
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Mining farms and repair centers ordering multiple S21 T21 control boards can contact us at contact@lys-sz.com for volume pricing and priority fulfillment. Worldwide shipping from our Shenzhen warehouse.
Buying in bulk for a mining farm or repair shop?
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