Bitmain APW9 / APW9+ Power Supply Unit Repair Guide & Components List

Bitmain APW9 / APW9+ Power Supply Unit Repair Guide & Components List (2026 Update)

The Bitmain APW9 and APW9+ are the dual-AC-input PSUs for the Antminer S17 generation — built around an LLC resonant topology with two independent AC input channels, two PFC stages, three 4028 high-speed fans, and a 14.5-21V adjustable main output at up to 170A (3600W rated). This guide covers the 20 most vulnerable components, the Bitmain-documented 6-step diagnostic workflow, the test point voltage references, the APW9 vs APW9+ differentiation, and the full repair playbook with direct sourcing links — companion to our APW8 PSU repair guide (S15 / T15 generation) and APW12 PSU repair guide (S19 generation).

Why APW9 / APW9+ PSU Repair Matters in 2026

The APW9 / APW9+ family powered the Antminer S17 generation — a fleet that remains in operation across many low-cost-power environments post-halving. Replacement APW9-class units are increasingly constrained in supply. Component-level repair is the most economical way to keep these PSUs producing, especially because the dual-AC-input architecture means each side can be diagnosed and repaired independently. The APW9 / APW9+ also shares many chip-level components with the APW7 (predecessor), APW8 (sibling S15 PSU), and APW12 (successor S19 PSU) — making a single bench inventory cover four PSU generations.

Compatible Antminer Models

The APW9 / APW9+ series powered the following Antminer models:

• S17 family: S17, S17+, S17 Pro (BM1397 7nm chip generation)
• T17 family: T17, T17+
• Some early S19 production used APW9+ before the APW12 became standard

The APW9 series ships in a 14.5V-21V DC adjustable output range, distinguishing it from the APW8 (16-20V for S15 / T15) and the APW12 (12-15V for S19). PSU compatibility is strictly generation-specific — an APW9 cannot be substituted for an APW8 or APW12 on a given miner chassis because the output voltage range, connector pinout, and control protocol differ.

APW9 vs APW9+ — Key Differences

The APW9 and APW9+ share the same architecture, the same chip-level components, and the same diagnostic procedure. The differences are in physical sizing and protection thresholds:

The APW9+ provides better tolerance to transient over-current events thanks to the higher OCP threshold, which is useful for miner tunes that produce brief current spikes during workload changes. The slightly lower max ambient temperature (50°C vs 60°C) reflects the larger PSU's tighter internal thermal margins.

APW9 / APW9+ PSU Architecture at a Glance

The APW9 / APW9+ is a dual-input LLC resonant switching supply with digital monitoring and a separate standby rail. Bitmain's documented architecture: two independent AC input channels (each with its own EMI / LC filter → rectifier → PFC stage → VBUS large capacitor → main switch MOS) feeding a shared LLC-DC switching stage → isolation drive → DC drive → synchronous rectification filter → DC main voltage output. A separate 12V auxiliary circuit per channel provides standby power and fan supply. Both AC inputs must be connected for full output rating; the PSU can derate when only one channel is powered.

Front panel and connector layout

• AC input: 2 × C14 (triangle-shape) connectors, each accepting a C13 AC cable
• Cooling: 3 × 4028 high-speed DC fans (vs 2 on the APW8)
• Main output: 4 × PCB-33 copper M4 soldering terminals (90° side-foot, M4 high-current horizontal fixing). Terminals near the air outlet are positive; terminals near the signal connector are negative.
• 12V output: PCIE 6-pin connector (yellow positive on pins 1/2/3, black negative on pins 4/5/6) — same pinout as APW8 and APW12.
• 4-Pin signal terminal: I²C bus (SDA / SCL) for output voltage control + EN enable signal. Per the Bitmain APW9+ manual, EN is active low — pull EN to GND to enable the main output (the EN-to-GND short test below confirms this behaviour for both APW9 and APW9+).
• Default test mode: short J15 PIN 4-5 (EN-to-GND) on the PIC communication header → main output enables at approximately 21.3V without a control board attached.

Board layout (Bitmain reference)

The PCBA is mirror-organised around the two independent AC channels:

• 1A — first AC input and EMI circuit
• 1B — first PFC and main shunt MOS circuit
• 1C — first 12V auxiliary and VCC circuit
• 2A — second AC input and EMI circuit
• 2B — second PFC and main shunt MOS circuit
• 2C — second 12V auxiliary and VCC circuit
• 2D — 12V output port and PIC communication port

Component-level architecture

• Dual AC input stage: F1 and F2 fuses (one per channel), U2 rectifier bridge per channel, anti-surge resistor and inrush relay per channel.
• Dual PFC stage: Q4 PFC switch MOS per channel with D5 / D6 / D7 diodes. Two independent PFC controllers: U21 and U1 (one per AC channel). PFC bus capacitor measures 410-420V DC under normal operation (higher than the APW8's 370-380V).
• Dual auxiliary 12V circuit: voltage-detection startup at R33 (47K) connected to HV via D1 / D2. F3 fuse, U5 driver IC, Q5 main switch MOS, D8 / D9 diodes, T1 12V transformer per channel. The two front-end 12V rails are series-converted to deliver +12V to the output (J6) for the miner control board. D1, D2, D21, D22 are critical failure-check points per Bitmain.
• Main switch MOS stage (LLC): Q31, Q32, Q15, Q16 form the LLC two-channel primary switching half-bridge. Built around the 600V-class MOSFET TK39N60W / K39N60W (TO-247, 600V / 38.8A).
• LLC-to-DC stage: the LLC resonant converter transforms the high-voltage bus into the isolated output rail through the main transformer.
• Main PWM control: SI8016HSP8 high-voltage PWM controller (SOP-8) — same controller as APW8. PWM circuit ICs at U9, U10, U24; each requires its VCC supply of 12V. Drive transformers at T5 or T7 (production variant) isolate the PWM drive signal.
• Current-mode PWM: UC2842B current-mode PWM controller (added to APW9 / APW9+ vs APW8) — handles secondary control loops.
• Gate drivers: IX4424NTR dual low-side MOSFET driver (shared with APW7 / APW8). UCC27210 / UCC27210D high-side / low-side 120V gate driver added on APW9 / APW9+ for the LLC primary stage.
• Synchronous rectification: Q17, Q18, Q19, Q20 output sync MOSFETs handle secondary-side switching. Built around TPHR8504PL (40V N-channel, shared across APW7 / APW8 / APW9 / APW12).
• Output Schottky rectifier: SBT20L100CT (20A / 100V low-Vf) and SBT30L45CT (30A / 40-45V) handle the output stage. The higher-current SBT30L45CT reflects the APW9's 170A capability vs APW8's 95A.
• Output filter: 1000µF 16V on the auxiliary rail.
• Primary bulk: 450V 270µF (30×40mm) primary DC bus capacitor.
• Isolation: PC817 optocoupler bridges the primary-secondary feedback loop. MBR0540 Schottky (0.5A / 40V) handles low-voltage signal-path protection.
• Voltage reference: ZTL431BFTA adjustable shunt voltage reference (2.5V / 100mA, SOT-23-3).
• Auxiliary LDO: LM1117-3.3 (3.3V LDO for low-voltage logic supply, added on APW9 / APW9+).
• PIC supervision: PIC16F1704-I/SL at position U12 — handles host I²C communication, voltage regulation, fault reporting. Firmware is reprogrammable via the J15 communication / programming port.
• Small-signal: MMBT3906 PNP + DSS5540X PNP BJT handle protection-circuit switching.
• Magnetics: PQ5030T inductor in the auxiliary chain.
• Cooling: 3 × 40 × 28mm 12V / 0.68A 4028 fans (16000 RPM).

5 Most Common APW9 / APW9+ Fault Symptoms — Bitmain Reference

The Bitmain APW9+ manual documents 5 distinct fault-symptom patterns. Use this table as the first triage step before opening the PSU case:

In addition to these 5 symptoms, the M6 copper-bar bolt diagnostic applies to the APW9 / APW9+ as it does to all Bitmain APW-class PSUs: loose hashboard-side M6 bolts can produce a "PSU appears dead" complaint with fans spinning and AC LEDs green. Always run the M6 re-torque check (3.0 N-m, spec range 2.5-3.5 N-m) before opening the PSU case.

Bitmain APW9 / APW9+ PSU Repair Components List

The table below lists every component LYS Shenzhen stocks for APW9 / APW9+ PSU repair. Each entry links directly to the corresponding part page — contact us at contact@lys-sz.com for the three unlinked components (330µF 35V capacitor, LM1117-3.3 LDO, PQ5030T inductor), for complete APW9 / APW9+ PSU replacement units, or for bulk farm-scale orders.

The M6 Copper-Bar Bolt Check — Try This Before Opening the PSU

The APW9 / APW9+ connects to the hashboards via M6 copper-bar bolts on the output side. The universal Bitmain M6 bolt failure mode applies: loose hashboard-side bolts present as a "dead PSU" complaint with PSU fans spinning, AC LED green on both inputs, but 0V on the output busbars (or oscillating 0V↔output as protection latches). Re-torque to 3.0 N-m (spec range 2.5-3.5 N-m) before opening the case.

1. Kill AC at the breaker / PDU on both channels. Wait 60 seconds for bulk caps to discharge.
2. Use a calibrated torque screwdriver in the 0.5-5 N-m range.
3. Loosen each M6 bolt 1/8 turn first, then re-torque to 3.0 N-m.
4. Inspect lock washers (must be present per bolt), ring terminals (no cracked crimps or corrosion), bolt threads (clean, not stripped), and busbar contact surfaces (no blackening or bluing).
5. If contact surface is blackened: polish with a brass brush to bright copper, wipe with 99% IPA, apply a thin film of no-ox conductive grease (Noalox or equivalent) before re-torquing.
6. Re-apply AC to both channels and verify the miner boots through its normal sequence.
7. Schedule a re-torque calendar reminder for 6-12 months out.

Internal APW9 / APW9+ Diagnostic Workflow (Bitmain-Documented 6-Step Procedure)

If the M6 bolt re-torque check is clean and the rail still won't come up, the fault is internal to the PSU. The Bitmain-documented procedure runs through 6 sequential steps.

Required tools

• Constant-temperature soldering iron above 80W: 300-350°C with pointed tip for chip resistors / capacitors; 380-420°C with blade tip for plug-in components.
• Hot air gun: 260°C ±2°C for chip removal — do not over-heat or the PCB will blister.
• AC controllable voltage regulator: 200-250V output, 0-20A current limit. Alternative: 100W incandescent bulb in series with AC live line as current limiter (with caution).
• Electronic load: 3.6KW capacity, 0-50V voltage rating. Alternative: matched resistive load.
• Multimeter (Fluke 15B+ recommended), suction gun, tweezers.
• V9-1.2 test jig + special power test card firmware. Substitute: S17 control board V1.2.
• Oscilloscope (recommended).
• Thermal silicone grease (model 2500) for MOSFET-to-heatsink interface; 704 silica gel for protective glue replacement on PCBA components; lead-free solder wire, flux, anhydrous alcohol board cleaner.

Safety — mandatory before opening the case

Both bulk capacitors (one per AC channel) must be discharged before any soldering. Verify residual voltage with a multimeter — must measure below 5V before touching the board. Wear an anti-static wrist strap and work on a grounded anti-static workbench. The PSU operates at AC220V — operational protection during powered measurements is mandatory.

6-step diagnostic procedure

1. Step 1 — External visual inspection. Check whether the PSU appearance is seriously damaged or deformed, and whether the DC fans (×3) and the AC sockets (×2) are damaged.
2. Step 2 — Apply AC 220V and verify basic operation. Both AC inputs energised. Verify all 3 fans rotate normally. Use the multimeter to check the J6 output terminal voltage = 12V (12.1-12.5V tolerance acceptable). This confirms the 12V auxiliary rail is healthy on both channels.
3. Step 3 — Open the case and inspect for sparking. After discharging both bulk capacitors below 5V, open the case. Look for sparking marks on components or solder side. Focus check points: D1, D2, D21, D22 critical diodes for damage, and the 12V circuit SMT capacitors for arcing/burning. Use the multimeter to check: F1 / F2 fuses for open circuit; U2 rectifier bridges per channel; PFC MOS Q4 and PFC diodes D5 / D6 / D7 for shorts (same check method on both channels); main switch MOSFETs Q31 / Q32 / Q15 / Q16 for shorts; output sync MOSFETs Q17 / Q18 / Q19 / Q20 for shorts. Any short = check and replace, paying attention to the MOSFET drive resistors and surrounding circuit (small-signal transistors may also be damaged).
4. Step 4 — Verify both 12V auxiliary circuits. Test F3 fuse, U5 driver IC, T1 transformer, Q5 main switch MOS, and D8 / D9 diodes per channel for shorts or open circuit. Inspect surrounding components for burn marks. Replace any damaged parts.
5. Step 5 — Verify PFC, PWM and drive stages. With AC powered, both DC fans rotating, and J6 reading 12V: measure the PFC bus capacitor at the TEST20-TEST30 OR TEST2-TEST7 test points — both should read 410-420V DC. If absent on either channel, check the PFC chip U21 or U1 (one per channel), specifically pin 7 VCC = 12V. Replace if damaged. If the PFC stage is healthy, check the PWM circuit ICs U9 / U10 / U24 for correct 12V VCC. Verify the T5 or T7 drive transformer (production variant) for damage.
6. Step 6 — Bench AC power-on test. Before final test, short J15 PIN 4-5 (EN-to-GND) on the PIC communication header. This enables the main output at the default 21.3V without a control board. Apply AC 220V on both channels. If both PFC large capacitors read 420V but no output appears after the EN-GND short, the PIC chip U12 firmware may need reprogramming, or the IC itself replaced (rare but possible failure mode). Caution: incorrect short connections may damage the PIC chip.

Key test point voltages (Bitmain reference)

• PFC bus voltage: measured at TEST20-TEST30 OR TEST2-TEST7, both channels should read 410-420V DC under normal operation.
• J6 12V output: 12V (12.1-12.5V tolerance acceptable).
• U21 / U1 pin 7 VCC: 12V (powers each PFC chip).
• U9 / U10 / U24 VCC: 12V each (powers the PWM circuit).
• Default-test output: ~21.3V after EN-to-GND short on J15 PIN 4-5.

Post-repair qualification test (Bitmain-mandated)

After bench tests confirm the PSU is functional:

1. Run the 12V auxiliary rail at 12A load and the main DC21V rail at 170A load simultaneously to qualify both outputs.
2. Run a minimum 2-hour aging soak test at 80% rated load (≥140A on the main rail) before considering the unit cleared for customer use.

When Chip-Level Repair Makes More Sense Than Replacement

New APW9 / APW9+ PSU stock is increasingly constrained — Bitmain stopped volume manufacturing of the S17-generation PSU several years ago. For S17 / T17 fleet operators, component-level repair is often the only realistic path. A small inventory of: the K39N60W primary MOSFETs (Q31/Q32/Q15/Q16 positions), the TPHR8504PL sync MOSFETs (Q17-Q20), the SI8016HSP8 PWM controller, the UC2842B current-mode controller, the IX4424NTR and UCC27210 gate drivers, the SBT20L100CT / SBT30L45CT output rectifiers, the PC817 optocoupler, the ZTL431BFTA voltage reference, the PIC16F1704 microcontroller, and the 450V 270µF + 1000µF 16V bulk capacitors covers the majority of bench-repair scenarios. Most of these parts are cross-compatible with APW7, APW8, and APW12 — a single bench inventory covers four PSU generations.

Stop DIY when there is visible cascade damage — scorched primary MOSFETs, blown PFC controllers, multiple swollen capacitor tops, or burn marks on the silkscreen. Replacing only the visibly-broken part leaves adjacent damaged-but-not-yet-failed silicon vulnerable to the next event.

FAQ — Bitmain APW9 / APW9+ PSU Repair

Which Antminer models use the APW9 / APW9+ PSU?

The APW9 / APW9+ powers the Antminer S17, S17+, S17 Pro, T17, and T17+ generation, with a 14.5-21V DC adjustable output range. Some early S19 production also shipped with APW9+ before the APW12 became standard. Newer S19-class miners use the APW12 (12-15V); older S15 / T15 miners used the APW8 (16-20V).

What is the difference between APW9 and APW9+?

The APW9 and APW9+ share the same architecture, output specifications (14.5-21V @ 170A, 12V @ 12A), chip-level components, and diagnostic procedure. The APW9+ has a higher overcurrent protection threshold (180-230A vs 95-130A) for better tolerance to transient current spikes, a slightly lower max ambient operating temperature (50°C vs 60°C), and larger physical dimensions (249×250×48.5mm vs 204.8×157×42.5mm). Component-level repair procedures are identical for both.

Why does the APW9 have two AC inputs?

The dual-AC-input architecture allows the PSU to deliver its full 3600W rating from two parallel 220V circuits, each rated for half the total power. This reduces per-circuit current draw and lets operators distribute the miner load across two separate power circuits at the rack PDU level. Both inputs must be connected for full output rating; the PSU can derate when only one channel is powered. The two PFC stages (controlled by U21 and U1) operate independently, so a fault on one channel can be diagnosed without affecting the other.

My APW9 shows AC LED green and fans spinning but the miner won't boot. Is the PSU dead?

Often this is loose M6 copper-bar bolts on the hashboard-side output, not a dead PSU. Run the M6 bolt re-torque procedure to 3.0 N-m (spec range 2.5-3.5 N-m) before opening the PSU case. The same mechanical failure mode affects all Bitmain APW-class PSUs because they use identical M6 copper-bar output topology.

How do I test the APW9 / APW9+ after repair?

Connect the repaired PSU to two AC sources at 200-240V. Short J15 PIN 4-5 (EN to GND) on the PIC communication header to enable the main output without a control board — the output should rise to approximately 21.3V. Verify both PFC bus capacitors at 410-420V DC. Then run a 12V × 12A load on the auxiliary rail and a 21V × 170A load on the main rail simultaneously to qualify both outputs. Finally, run a 2-hour aging soak test at 80% rated load (≥140A) before discharging the PSU from the bench.

Sourcing APW9 / APW9+ PSU Repair Parts

LYS Shenzhen stocks 17 of the 20 critical APW9 / APW9+ components in our public catalogue. For the three unlinked components (330µF 35V electrolytic, LM1117-3.3 LDO, PQ5030T inductor), for complete APW9 / APW9+ PSU replacement units, or for bulk farm-scale orders, contact our team at contact@lys-sz.com — we operate an on-demand sourcing channel for repair components across the full Antminer PSU lineup including APW7, APW8, APW9, APW9+, APW11, APW12, and the newer APW17 series.

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.