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The Antminer S21, S21 Pro, and S21 XP use the Ctrl_C76 or Ctrl_C81 control board (Amlogic A113D chipset) — not the older Zynq used in S19 series. WhatsMiner M50S++/M60S use the CB6-V10 (H616 chipset). Iceriver KS3/KS5 Kaspa miners have a proprietary board. All replacement boards are pre-flashed to your exact miner model before shipping. Prices from ₹4,500 with 90-day warranty.
ASIC Control Board Replacements India — 2025–2026
Antminer S21 C76/C81 · WhatsMiner CB6 · Iceriver KS3/KS5 · Pre-Flashed
Available Models
WhatsApp us to confirm current stock and pricing before ordering.
Antminer S21 Series — C76 / C81 (Amlogic A113D)
Current-generation control board for Antminer S21, S21+, S21 Pro, S21 XP, and T21. Uses Amlogic A113D chipset — not the older Zynq/BeagleBone architecture. Boards are pre-flashed to your exact miner sub-model before shipping.
Antminer S19 XP / L7 / K7 — BB18 / Zynq
Previous-generation control board for high-performance S19 XP, L7, and K7 miners still widely deployed in Indian farms. Available in BB18 (BeagleBone) and Xilinx Zynq variants with stock Bitmain firmware.
WhatsMiner M50S++ / M60S — CB6-V10 (H616)
Current-generation control board for WhatsMiner M50, M50S, M50S++, M60, and M60S air-cooled series. CB6-V10 uses the H616 chipset and runs firmware up to Whatsminer-all-20260416. Requires WhatsMinerTool v9.2.4+ for flashing.
WhatsMiner M30S / M30S++ — CB4 / CB5
Previous-generation control board for the M30 series still heavily deployed across Indian mining farms. Solves Error 201, network dropouts, and zero hashrate. CB5 is the upgraded variant for M30S++ and M31S batches.
Iceriver KS3 / KS5 Control Board
Replacement control boards for Iceriver KAS miners — the most popular Kaspa ASIC in India. Symptoms of failure: miner powers on but cannot be found via IP scan, constant restarts, or failure to initiate hashing despite PSU power.
Control Board Failure Symptoms vs. Hashboard Failure
🚫 Control Board Failure Signs
- ✕Miner powers on but no IP appears on router / network scan
- ✕Ethernet port LEDs dark or not blinking
- ✕Web dashboard not accessible from any browser
- ✕No pool connections — zero hashrate despite PSU running
⚡ Hashboard Failure (Different Problem)
- ✓IP accessible — web dashboard loads normally
- ✓Hashrate lower than spec (e.g., 80 TH/s instead of 234 TH/s)
- ✓Dashboard shows 1 or 2 chains missing
- ✓Requires chip-level repair — not a control board issue
⚠️ Firmware Warning (S21 Owners): Antminer C76/C81 boards require firmware specific to your exact sub-model. S21 Pro firmware will brick an S21 XP. We pre-flash all boards to your miner model — always provide your exact serial number via WhatsApp before we ship. Using the wrong firmware causes the miner to fail to detect hashboards.
Compatible Hardware
Board version, chipset, and firmware variant confirmed before every order. Provide your miner serial number.
Board version, chipset, and firmware variant confirmed before every order. Provide your miner serial number.
Still have questions about ASIC Control Board Replacements India — 2025–2026?
WhatsApp our Akola bench team — we confirm compatibility and stock before you order.
How Ordering Works
Click Buy Now — WhatsApp opens
Provide exact miner model, serial number, and cooling type (air/hydro/immersion)
We verify board version, chipset, and correct firmware variant
Board pre-flashed and shipped from Akola within 24 hours
Before Replacing — Consider Repair
Many issues can be fixed professionally at lower cost. Our Akola bench offers full diagnostics.
Frequently Asked Questions
What control board does the Antminer S21 Pro use?
The Antminer S21, S21+, S21 Pro, S21 XP, and T21 all use the Ctrl_C76 or Ctrl_C81 control board based on the Amlogic A113D chipset — a fundamental change from the Zynq-7007 used in S19 series. These boards are NOT cross-compatible. After installation, firmware must be flashed specific to your exact S21 sub-model (S21 Pro firmware is different from S21 XP firmware).
How do I know if my Antminer S21 control board has failed?
A failed control board on the S21 series shows these signs: the miner powers on (APW17 fans spin), but no IP address appears on your router DHCP list, the Bitmain web dashboard cannot be accessed from any browser, and the ethernet port LEDs are dark or static. If hashboards are detected but performance is low, the issue is likely hashboard-level, not the control board.
What control board does the WhatsMiner M60S use?
The WhatsMiner M60S air-cooled variant uses the CB6-V10 control board with H616 chipset, running MicroBT firmware (Whatsminer-all-20260416 as of mid-2026). Note that the M63S (hydro-cooled) uses CB6-V5, and immersion variants use CB6-V7. Always check the model label on your original board — the physical connector layout differs between cooling types.
Is the WhatsMiner M30S control board still available?
Yes. The CB4 and CB5 control boards for the M30S and M30S++ series are still stocked — the M30S remains the most common WhatsMiner deployed in Indian farms. The CB5 is the upgraded variant used in M30S++ and M31S batches. Both boards require H6OS firmware, flashed using WhatsMinerTool before the hashboards will be recognized.
My Iceriver KS5 cannot be found on the network — is it the control board?
Possibly. Iceriver KS series control board failure symptoms are identical to Antminer/WhatsMiner: no IP on network scan, constant restart loop, or failure to initiate hashing. However, first check the signal cable connection between PSU and control board — a loose connection often causes the same symptoms. WhatsApp +91 8208752205 with a description and we will diagnose before recommending a replacement.
Mohammad Arif, Senior ASIC Repair Technician — Akola bench, Maharashtra
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