Avalon Canaan 1246 Hashboard Repair Guide & Components List
The Canaan Avalon 1246 is the upper-tier SHA-256 BTC mining ASIC from the Avalon A10 generation — running at ~85-90 TH/s on the Canaan A3210 ASIC chip platform, drawing ~3420W from the PSU3300-03 PLUS power supply, and built around a modular 17.5V boost-module hashboard topology shared with the A1166 / A1166 Pro generation. The 17.5V boost module is the most distinctive A1246 hashboard repair feature — it can be replaced as a complete sub-assembly, similar in concept to the modular PFC sub-board on the PSU3300-03 PLUS. This guide covers the 11 most vulnerable A1246 hashboard components, the modular boost module replacement procedure, and the full repair playbook with direct sourcing links — paired with our companion PSU3300-03 PLUS repair guide for full A1246 miner-level coverage.
Why Avalon 1246 Hashboard Repair Matters in 2026
The A1246 sits in the upper tier of the Avalon A10 generation alongside the A1166 Pro. Most A1246 units in the field are now 3-5 years into 24/7 service, putting them in the zone where ASIC chips fail one-by-one from cumulative thermal stress, LDOs drift, and the 17.5V boost module degrades. With Canaan's volume production for the A10 generation tapered and secondary-market A1246 boards constrained, component-level repair is the realistic path. A small repair-bench inventory — the AP1084 LDO, NCP114AMX075TCG LDO, ICDITI791CK5Q voltage regulator, TLV75801PDRVT regulator, NR8040 6R8 power inductor, MAX14930FASE+ digital isolator, 813RN A0231 crystal oscillator, MMBT3904 small-signal transistor, plus a couple of spare 17.5V boost modules — covers the bulk of bench-repair scenarios.
Avalon A10 Generation Cross-Compatibility
The A1246 hashboard shares major architectural elements with the A1166 family:
- Shared 17.5V boost module: the modular boost sub-assembly is identical between the A1166 / A1166 Pro and the A1246 — a single boost-module spare covers both generations
- Shared LDO chain: AP1084, NCP114AMX075TCG, TLV75801PDRVT, ICDITI791CK5Q LDOs cross-apply across the A1166 family and A1246
- Shared signal-path components: 813RN A0231 crystal oscillator and MAX14930FASE+ digital isolator are used on both the A1166 and A1246 hashboards
- Shared PSU3300-03 PLUS: same 3400W PSU covers the A1246 and the A1166 Pro
- Distinct ASIC chip: the A1246 uses the Canaan A3210 ASIC chip on a 16nm process — 38 chips per hashboard, 3 hashboards per miner = 114 chips total at ~90 TH/s (~30 TH/s per board). The A3210 is separate from the A1166's earlier chip generation — chip stock tracked separately even though the supporting BOM is largely shared.
This cross-compatibility is reflected in the LYS product URLs themselves — multiple components carry "avalon-1166pro" or "avalon-1246" or "avalon-1166-1246" in their slugs, signalling the shared bill of materials.
AUC3 Controller + CAN Bus Daisy-Chain Architecture (A1246 distinguishing feature)
The A1246 does not have a built-in network controller like Bitmain Antminer / Whatsminer miners. Instead, the A1246 connects to an external AUC3 controller — a USB-to-CAN adapter that bridges from a Raspberry Pi (or other host) to a daisy chain of A1246 miners over CAN bus. The AUC3 hosts the AvalonMiner Controller software (CGMiner-based) and exposes a JSON API on port 4028 for diagnostics. This architecture has two consequences for repair:
- No direct SSH to the miner: all diagnostics flow through the AUC3 controller (typically SSH to the Raspberry Pi, then use `echo '{"command":"estats"}' | nc localhost 4028 | python3 -m json.tool` to query each module in the daisy chain).
- Per-chip status string: the AUC3 `estats` command returns an ASIC status string per hashboard — 38 characters representing each chip, "o" = working, "x" = failed. Reading this string is the fastest first-pass diagnostic to localise dead chips on a specific hashboard.
- CAN bus cable is single-point-of-failure for the chain: a damaged CAN bus cable breaks communication to every miner downstream of it in the daisy chain. CAN bus cables are also susceptible to EMI — route them away from power cables.
LED indicator codes (A1246 front panel)
| LED Pattern | Status |
|---|---|
| Green — Steady | Normal operation, miner is hashing and communicating with AUC3 |
| Green — Flashing (1× per 2s) | Mining normally — standard operating flash pattern |
| Red — Steady | Error condition (overheating, hashboard failure, network failure, firmware corruption) |
| Red — Flashing (2× per 2s) | Network / CAN bus failure — check cable connections to AUC3 |
| Blue — Flashing | Booting up, firmware upgrade in progress, or factory reset in progress |
| Yellow — Steady | Idle mode — miner is powered on but not receiving work from the controller |
| No LED | No power reaching control circuits — check power cable, integrated PSU, wall outlet |
A3210 chip signal chain — CK / C / R / D
The 38 A3210 chips on each hashboard are organized in series-connected groups with four signal-chain lines:
- CK (Clock): 25 MHz working clock — drives the SHA-256 hashing operations on each chip. Generated by the 813RN A0231 crystal oscillator.
- C (Clock Transmit): 5 MHz synchronization clock transmitted between chips to keep the chain coordinated.
- R (Reset): Reset signal for chip initialization. A broken reset chain prevents downstream chips from starting.
- D (Data): Data bus for mining work distribution and nonce results. A break here means downstream chips receive no work.
Critical diagnostic insight: when one chip fails in the signal chain, all chips downstream of it in that particular series group may also stop functioning — even though the downstream chips themselves are healthy. This is why a single failed A3210 can kill the hashrate contribution of an entire chain segment. Identifying the FIRST failed chip in the chain is critical for efficient repair. Read the AUC3 `estats` ASIC status string from left to right — the first "x" character marks the position where the chain breaks.
A1246 Hashboard Architecture at a Glance
The A1246 hashboard follows the Avalon A10 generation modular-boost topology:
- Modular 17.5V boost module: a daughter-card sub-assembly that takes the PSU rail input and generates the 17.5V elevated rail feeding the upper-domain LDOs. The module is mechanically and electrically replaceable as a complete unit, which is the fastest single repair path when boost-stage failure is suspected.
- LDO chain: AP1084 + NCP114AMX075TCG (0.75V) + TLV75801PDRVT + ICDITI791CK5Q regulators distribute the 17.5V boost rail down to the ASIC chip operating voltages.
- Power inductor (NR8040 6R8): 6.8µH power inductor in the boost module (A1246-explicit listing).
- Crystal oscillator (813RN A0231): 25 MHz ceramic crystal oscillator providing the timing reference for the ASIC chain.
- Digital isolator (MAX14930FASE+): provides isolated signal communication between the control board and the hashboard, protecting both sides from voltage transients.
- Small-signal support (MMBT3904 1AM): NPN small-signal transistor on the bias and gate-drive support network.
- Output filtering: 25V 330µF SMD electrolytic capacitors on the rail decoupling stages.
- Resistor 000 (0Ω jumper): zero-ohm jumpers on routing / configuration links.
Most Common A1246 Hashboard Failure Modes
- Boost module failure (17.5V rail dead or out of spec) — the most distinctive A1246 failure. The Avalon 1166 / 1246 boost module (17.5V) is replaceable as a complete daughter-card sub-assembly. When boost-stage failure is confirmed (no 17.5V at the boost output even with PSU input present), modular replacement is faster and lower-risk than chip-level rebuild of the boost stage.
- AP1084 LDO drift or failure — degraded AP1084 LDO voltage regulator drops or drifts the local rail. Voltage check at the AP1084 output pin confirms the fault.
- NCP114AMX075TCG 0.75V LDO failure — the NCP114AMX075TCG (AWL) 0.75V LDO drops the chip core voltage when it fails, taking the local domain offline.
- TLV75801PDRVT regulator failure — degraded TLV75801PDRVT (TLV758P) 6p WSON regulator drops or drifts the regulated output. Check the output pin against the expected reference voltage.
- ICDITI791CK5Q regulator failure — failed ICDITI791CK5Q voltage regulator (A1246-explicit) drops the local rail. The A1246-specific URL confirms LYS stocks this with explicit A1246 fit.
- Crystal oscillator failure (no chain initialisation) — failed 813RN A0231 25MHz ceramic crystal oscillator prevents chain initialisation entirely. Hashboard not detected at all on the test fixture.
- Digital isolator failure (signal path broken) — failed MAX14930FASE+ digital isolator breaks the control-board-to-hashboard signal path, causing the hashboard to drop offline or fail to enumerate.
- Boost-stage inductor degradation — degraded NR8040 6R8 power inductor (A1246-explicit) in the boost module reduces boost-stage efficiency or produces audible noise under load. Replace the inductor or the complete boost module.
- Small-signal transistor failure (gate-drive / bias) — failed MMBT3904 (1AM) NPN transistor on the bias network can cascade to LDO or boost-stage misbehaviour. Multiple MMBT3904 positions exist on the hashboard.
- Output filter cap degradation under load — degraded 25V 330µF SMD electrolytic capacitors no longer hold rail voltage during transient draw. Visual inspection for swollen tops or leakage; ESR meter check for in-spec performance.
- 0Ω jumper open from mechanical damage — the 0Ω SMD resistors on routing links can crack from mechanical stress (PCB flex during transport, heat-cycle fatigue). Continuity test confirms.
A1246 Hashboard Repair Components List
The table below lists every component LYS Shenzhen stocks for A1246 hashboard repair. Each entry links directly to the corresponding part page — contact us at contact@lys-sz.com for the Canaan A3210 ASIC chip (sourced by quote), 0Ω jumpers, 25V 330µF SMD capacitors, or for bulk farm-scale orders.
| Part Number | Component Type | Typical Position / Role |
|---|---|---|
| TLV75801PDRVT (1MHH) | LDO voltage regulator | 6p WSON adjustable linear regulator — Avalon hashboard rail |
| NCP114AMX075TCG (AWL) | LDO regulator | 0.75V LDO — chip core voltage rail (Avalon-explicit URL) |
| Resistor 000 | 0Ω resistor | SMD jumper on routing / configuration links |
| NR8040 6R8 | Power inductor | 6.8µH boost-stage energy storage (A1246-explicit URL) |
| MMBT3904 (1AM) | NPN small-signal transistor | Bias network / gate-drive support (cross-shared with Bitmain APW3 / APW7) |
| ICDITI791CK5Q | Voltage regulator | Local rail regulator (A1246-explicit URL) |
| AP1084 | LDO voltage regulator | Low-dropout power-supply LDO — local rail generation (cross-shared with A1166 Pro) |
| 813RN A0231 | Ceramic crystal oscillator | 25 MHz timing reference for ASIC chain (cross-shared with A1166 Pro) |
| MAX14930FASE+ | Digital isolator | Isolated signal communication between control board and hashboard (cross-shared with A1047 / A1066) |
| 25V 330µF SMD | Electrolytic capacitor | Rail decoupling — contact us for stock check |
| Avalon 1166 / 1246 Boost Module (17.5V) | Modular boost sub-assembly | 17.5V boost module — direct daughter-card replacement covering A1166 + A1166 Pro + A1246 |
Modular Boost Module Replacement Procedure
The 17.5V boost module is the A1246's most distinctive repair feature. When boost-stage failure is confirmed (no 17.5V rail at the boost module output, even with PSU input present), the entire module can be swapped as a daughter-card sub-assembly — significantly faster and lower-risk than chip-level rebuild of the boost stage:
- Disconnect AC, discharge bulk capacitors on the PSU3300-03 PLUS, open the A1246 chassis.
- Identify the boost module — a small PCB daughter-card mounted perpendicular or coplanar to the main hashboard, with its own connector header to the main PCB.
- De-solder the boost module's connection pins from the main hashboard. Note pin orientation and polarity before removal.
- Lift the boost module out, separating from its mechanical mounts.
- Clean the main hashboard joint areas with anhydrous alcohol. Inspect for any solder bridge or burnt pad — repair if needed.
- Install the replacement boost module: align mechanical mounts, seat connector pins, solder pins from the main hashboard side.
- Verify mechanical clearance — no PCB-to-PCB contact that could short under vibration.
- Reassemble chassis, function test: verify 17.5V at the boost module output, then verify each domain LDO output rail downstream.
Diagnostic Workflow
Pre-power inspection
- Visual: check hashboard PCB for deformation, scorching, displaced components, solder bridges around the boost module connector.
- Resistance: measure input rail to GND for short. Measure each LDO output rail to GND for shorts (failed LDOs typically present as shorts to GND).
- Connector: check the signal connector for damaged or bent pins.
Power-rail verification
- Step 1 — PSU3300-03 PLUS output check. Verify the PSU is providing the correct output voltage (11.5-14.5V configurable). Use the PSU3300-03 PLUS repair guide standalone bench test (short 2-pin near V+ terminal, expect ≥11.9V) to confirm PSU health before troubleshooting the hashboard.
- Step 2 — Boost module 17.5V check. Measure 17.5V at the boost module output. If absent, the boost module has failed — consider modular replacement (see procedure above).
- Step 3 — LDO output check. Verify each LDO output: AP1084 (local rail), NCP114AMX075TCG (0.75V), TLV75801PDRVT (configured rail), ICDITI791CK5Q (configured rail). Out-of-spec output on any LDO points to that specific regulator failure.
- Step 4 — Crystal oscillator check. Verify the 25 MHz output at the 813RN A0231 crystal. If absent, the crystal has failed and the chain cannot initialise.
- Step 5 — Digital isolator continuity check. Verify signal continuity through the MAX14930FASE+ on both control-board and hashboard sides. Failed isolator presents as signal not crossing the isolation barrier.
- Step 6 — Small-signal MMBT3904 + 0Ω jumper checks. Inspect MMBT3904 positions in the bias network for diode-mode integrity. Check 0Ω jumpers for continuity (cracks from mechanical stress are a common subtle failure).
Safety — Mandatory Before Opening the A1246 Chassis
The A1246's integrated PSU3300-03 PLUS (3420W, 176-264V AC input) sits inside the miner chassis — unlike Bitmain Antminer / Whatsminer designs where the PSU is external. This means opening the A1246 chassis exposes you to high-voltage components even with the AC cable disconnected.
- Power off and unplug the miner completely. Wait at least 5 minutes for the integrated PSU capacitors to discharge before opening the chassis.
- Wait 10 minutes for thermal cool-down: heatsinks can exceed 80°C during operation. The aluminum heatsinks retain heat longer than expected, especially in the center of the chassis where airflow is weakest after shutdown.
- Wear an anti-static wrist strap grounded to the chassis whenever handling hashboards. The A3210 chips on 16nm process are sensitive to ESD — a static shock under 100V (which you cannot feel) can permanently degrade or destroy chips.
- Work on an ESD-safe surface: never touch chip surfaces directly.
- Document everything: photograph cable positions and connector orientations before disconnecting anything — the flat ribbon cables and CAN bus connectors are easy to mis-route on reassembly.
Recommended Maintenance Schedule
| Interval | Task |
|---|---|
| Weekly | Check AUC3 controller dashboard: all 3 hashboards reporting, chip temperatures in range, fan speeds normal, hashrate at ~90 TH/s |
| Bi-weekly | Visual inspection of intake/exhaust for dust. Listen for unusual fan bearing noise. Check CAN bus cable connections between daisy-chained units. |
| Monthly | Compressed air cleaning of fan blades, intake grills, exhaust vents. Verify AUC3 connection stability. Check Ethernet cable condition. |
| Quarterly | Full internal inspection — remove chassis cover, blow out heatsink fins, check all cable connections for corrosion or looseness. Verify fan RPMs match spec. Inspect power cable and plug for heat damage. |
| Annually | Thermal paste inspection and replacement if degraded (gradually rising chip temps by 5-10°C is the indicator). Full PSU voltage check. Deep clean of all internal surfaces. Firmware update if available from Canaan. |
Post-Repair Validation
- Reinstall hashboard into A1246 chassis with PSU3300-03 PLUS connected.
- Apply AC power and verify the indicator LED on the PSU3300-03 PLUS transitions from any fault pattern to normal.
- Verify the hashboard enumerates correctly to the control board (no "chain missing" alarm).
- Verify hashrate ramps to the A1246 nameplate (~85-90 TH/s steady-state) within 10-15 minutes of cold start.
- Monitor hashboard temperature in the web backend — should stay within Canaan's published thermal envelope.
- Run a 2-hour soak test at full hashrate before considering the hashboard cleared for customer return — catches latent failures that survive the initial bench test but fail under sustained thermal stress.
When Chip-Level Repair Makes More Sense Than Replacement
New A1246 hashboard stock is increasingly constrained — Canaan's volume production for the A10 generation has tapered, and the secondary market is mostly other operators' failed boards. For Avalon A10 fleet operators, component-level repair is the realistic path. The 17.5V boost module is shared with the A1166 family, so a single boost-module spare covers both generations — high-value inventory item. The LDOs (AP1084, NCP114AMX075TCG, TLV75801PDRVT, ICDITI791CK5Q), the crystal oscillator (813RN A0231), the digital isolator (MAX14930FASE+), and the MMBT3904 small-signal transistor cover the rest of the bench-repair scenarios.
Several A1246 components are shared across other miners — MMBT3904 with the Bitmain APW3 + APW7 PSUs, AP1084 + 813RN A0231 with the Avalon A1166 Pro hashboard, MAX14930FASE+ with the Avalon A1047 + A1066 hashboards. A repair bench already stocking parts for the Bitmain or Avalon A1166 line can extend coverage to the A1246 with relatively few additions.
FAQ — Avalon Canaan 1246 Hashboard Repair
What ASIC chip does the A1246 use?
The Avalon 1246 uses the Canaan A3210 ASIC chip — a SHA-256 BTC mining ASIC released in the A10 generation. The A1246 runs at ~85-90 TH/s on this chip, drawing ~3420W from the PSU3300-03 PLUS. The A3210 chip is sourced by quote at LYS Shenzhen due to demand variability.
What is the difference between the A1246 and the A1166 Pro?
Both share the same chassis, the same PSU3300-03 PLUS, the same 17.5V boost module, and most of the supporting LDO + signal-path BOM. The A1246 uses the Canaan A3210 ASIC chip and runs at ~85-90 TH/s. The A1166 Pro uses the earlier Canaan A3205 ASIC chip and runs at lower hashrate. Chip-level repair stock is separate, but boost module + LDOs + crystal + digital isolator are interchangeable between the two.
Can I replace the boost module without rebuilding the whole hashboard?
Yes — the 17.5V boost module is designed as a modular daughter-card sub-assembly. De-solder the connection pins from the main hashboard, lift the module out, install a fresh replacement boost module, and verify the 17.5V rail output. This is significantly faster and lower-risk than chip-level rebuild of the boost stage. The same boost module covers the A1166, A1166 Pro, and A1246.
What PSU should I use to test the A1246 hashboard on the bench?
The PSU3300-03 PLUS (Canaan 3400W) is the production PSU for the A1246. For bench testing, the same PSU works — use the standalone bench-test procedure documented in our PSU3300-03 PLUS repair guide (short 2-pin on right of V+ terminal, expect ≥11.9V output) to confirm PSU health before hashboard testing.
My A1246 won't enumerate — boost module or crystal oscillator?
Both can cause "hashboard not detected" on the control board. Diagnostic order: (1) verify PSU3300-03 PLUS output at the hashboard input rail; (2) measure 17.5V at the boost module output — if absent, replace the boost module; (3) if 17.5V is healthy, verify 25 MHz at the 813RN A0231 crystal oscillator output — if absent, replace the crystal; (4) if both are healthy, check the MAX14930FASE+ digital isolator for signal continuity.
How do I localise a failed LDO on the A1246?
The LDOs (AP1084, NCP114AMX075TCG, TLV75801PDRVT, ICDITI791CK5Q) each generate a specific rail voltage. Measure the output pin of each LDO against the expected reference voltage. A short to GND on the output indicates the LDO has failed catastrophically; a low or drifting reading indicates degraded regulation. Visual inspection for swollen / burnt LDO packages also helps localise.
Is the A1246 still profitable to repair in 2026?
The A1246's ~85-90 TH/s with ~3420W power draw places it in the "operate the existing fleet rather than buy new" zone for most operators in 2026 — Bitcoin block rewards have compressed and the A1246's J/TH ratio is no longer competitive with current-gen miners. However, in low-power-cost regions, the A1246 can still earn at positive margins for another 1-2 years with structured maintenance. Component-level repair on the existing fleet is cheaper than new-miner replacement. Contact LYS Shenzhen at contact@lys-sz.com for parts pricing.
Sourcing A1246 Hashboard Repair Parts
LYS Shenzhen stocks every component listed above for the Avalon Canaan 1246 hashboard, including the 17.5V boost module (shared with A1166 family), the AP1084 + NCP114AMX075TCG + TLV75801PDRVT + ICDITI791CK5Q LDOs, the 813RN A0231 crystal oscillator, the MAX14930FASE+ digital isolator, and the MMBT3904 small-signal transistor. For the Canaan A3210 ASIC chip (sourced by quote), 0Ω jumpers, 25V 330µF SMD capacitors, the broader Avalon lineup (A1166, A1166 Pro, A1346 Pro, A1466), or for A1246 complete-miner sourcing, contact our team at contact@lys-sz.com.
Worldwide shipping from our Shenzhen warehouse via DHL, FedEx, UPS, and sea freight. DDP shipping available for US and EU customers; case-by-case for other lanes — request a quote with your shipping country for confirmation.
