Innosilicon G1286 Power Supply Unit Repair Guide & Components List

Innosilicon G1286 Power Supply Unit Repair Guide & Components List

The Innosilicon G1286 is the legacy PSU for the Innosilicon T2T / T2T+ / T3 SHA-256 BTC mining family — a 12V single-rail switching supply built around a PFC + LLC half-bridge topology with the TI UCC28070APWR interleaved dual-channel PFC controller and the FAN3224T dual-low-side gate driver (which it shares with the Bitmain APW7 generation). With ETHash mining now dead (Ethereum migrated to PoS in 2022) and Innosilicon's T-series mostly repurposed for SHA-256 or other compatible algorithms, the G1286 is in its end-of-life phase — but operators running surviving T2T units in cheap-power regions can keep them earning a few more years with structured component-level repair. This guide covers the 10 most vulnerable G1286 components, the cross-platform repair-stock sharing with Bitmain APW7 + Whatsminer P21, and the full repair playbook with direct sourcing links.

Why Innosilicon G1286 PSU Repair Matters in 2026

The G1286 is a niche PSU — Innosilicon's T-series volume was always smaller than Bitmain or MicroBT, and the ETHash market collapsed in 2022 with Ethereum's PoS migration. What remains of the G1286 installed base is operators in cheap-power regions running surviving T2T / T2T+ units on ETC, EthereumFair, or other ETHash-compatible chains. New G1286 replacement units are essentially unavailable on the secondary market, which makes component-level repair the only realistic path. The good news: the G1286's BOM overlaps significantly with the Bitmain APW7 + Whatsminer P21 PSU lineups — so a repair bench already stocked for those generations covers most G1286 failures with no incremental inventory.

G1286 PSU Cross-Platform Repair-Stock Sharing

The Innosilicon G1286 shares several key ICs with other crypto miner PSUs — a repair bench already stocking parts for the Bitmain APW7 or Whatsminer P21 lineups covers most G1286 failures:

• FAN3224T dual-low-side gate driver: shared with the Bitmain APW7 PSU — LYS product URL explicitly names both (APW7 + G1286)
• IPW60R060P7 high-voltage MOSFET: shared with the Whatsminer P21 PSU — Infineon CoolMOS 600V N-channel primary switching
• NTC 8D-20 thermistor: cross-shared with Innosilicon and Whatsminer PSU families
• OSG60R074HZ MOSFET: generic SMPS high-voltage MOSFET
• G47N60EF (SIHG47N60EF): Vishay Siliconix 600V / 47A N-channel MOSFET, also used on other generic SMPS designs

The G1286-specific components are the UCC28070APWR PFC controller, the PBSS5240T (PNP) and PBSS4240T (NPN) small-signal transistor pair, and the large primary bulk capacitor — but even these are commonly stocked on a Bitmain / Whatsminer / Innosilicon multi-platform repair bench.

G1286 PSU Architecture at a Glance

The G1286 (also marketed as G1286A — same product, different revision label) is a PFC-fronted LLC half-bridge switching supply with interleaved dual-channel PFC. It is positioned as the dual-tube ("double barrel") Innosilicon T-series PSU, designed to power miners pulling 25T-50T hashrate (1000W+ class loads):

• AC input: 160-264V AC universal range with Active PFC (wider input range than typical APW7-class PSUs — supports both 110V-class derated and full 220V operation)
• DC output: 12V single-rail, designed to support >1000W loads (typical dual-tube T2T/T3 configurations at 25T-50T draw)
• Output connectors: standard 6-pin GPU power connections + 4-pin CPU power connectors (consumer PSU-style connector format, unlike the M6 copper bars on Whatsminer P21 or PCIE 6-pin clusters on Bitmain APW7)
• Safety: built-in over-voltage protection + short-circuit protection + thermal protection to prevent overheating and equipment damage
• Input protection: F1 fuse + NTC 8D-20 inrush thermistor + varistor on the AC line
• PFC stage: UCC28070APWR dual-channel interleaved PFC controller driving two parallel boost MOSFETs (IPW60R060P7 primary boost + OSG60R074HZ) for higher-power factor correction with reduced ripple. The 500V 330µF bulk capacitor holds the PFC bus.
• LLC half-bridge primary switching: G47N60EF (SIHG47N60EF) 600V / 47A Vishay Siliconix MOSFETs form the primary LLC half-bridge pair (TO-247AC through-hole).
• Gate drive: FAN3224T dual 4A high-speed low-side gate driver handles the gate pulses for the primary MOSFETs (shared APW7 + G1286 per the LYS product URL).
• Secondary stage: synchronous rectification on the secondary side feeds the 12V output bus. 30V 820µF electrolytic capacitors handle output filtering.
• Small-signal support: PBSS5240T (ZFW) PNP transistor (G1286-explicit URL) and PBSS4240T (ZEW) NPN low-Vcesat 40V / 2A transistor (G1286-explicit URL) form the PNP/NPN small-signal pair on the bias and protection circuits.

G1286 PSU Repair Components List

The table below lists every component LYS Shenzhen stocks for G1286 PSU repair. Each entry links directly to the corresponding part page — contact us at contact@lys-sz.com for bulk pricing or for the 30V 820µF and 500V 250µF capacitors (currently sourced on-demand).

Most Common G1286 PSU Failure Modes

• PSU dead — no output, fan not spinning — check the F1 input fuse first. Blown fuse usually points to a downstream primary-side short. Diode-mode test on the IPW60R060P7 + OSG60R074HZ + G47N60EF primary MOSFETs to localise the short.
• PFC controller failure (no PFC bus voltage) — failed UCC28070APWR stops the PFC stage from boosting. Check VCC at the IC and gate-drive output to the boost MOSFETs.
• Primary MOSFET short — failed IPW60R060P7, OSG60R074HZ, or G47N60EF presents as a hard short on the primary stage and usually takes the F1 fuse with it. Diode-mode test confirms.
• Gate driver failure (no LLC switching) — failed FAN3224T stops the LLC half-bridge from receiving gate pulses. Verify gate-drive waveform on the primary MOSFETs (oscilloscope on the gate pin).
• Inrush surge damage (NTC sacrificed) — a mains surge or repeated cold-start cycles can sacrifice the NTC 8D-20 thermistor. Replace with same value/spec.
• Small-signal transistor failure (bias network) — failed PBSS5240T or PBSS4240T on the bias and protection circuits can cascade into LDO or controller misbehaviour. Diode-mode test on the BJT junctions.
• Output ripple high under load — degraded 30V 820µF secondary-side electrolytic capacitors. Visual inspection for swollen tops or leaked electrolyte; ESR meter for in-spec performance confirmation.
• Primary bulk cap failure / PFC instability — degraded 500V 250µF primary bus capacitor produces ripple on the PFC output. Replace with same voltage class (LYS stocks 500V 330µF as nearest capacity-equivalent).

Diagnostic Workflow

Bench setup

• AC voltage regulator (0-265V output) for startup verification.
• Electronic load 1800W+ for full-load testing.
• Multimeter (Fluke 15B+ recommended) for diode-mode + AC ripple measurement.
• Oscilloscope for LLC switching waveform and PFC bus ripple inspection.
• Soldering equipment (80W+ constant-temperature iron, hot-air station) for IC replacement.
• Discharge pen / bleeder resistor for bulk capacitor discharge before opening.
• Anti-static workbench + wrist strap for ESD-sensitive IC handling.

Safety — mandatory before opening the case

The 500V primary bulk capacitor stores lethal energy even when AC is disconnected. Always discharge the bulk cap with a discharge pen before opening the case. Verify residual voltage with a multimeter — measure below 5V before touching the board. Wait for the fan to stop completely after AC disconnect — this confirms the bulk cap has bled down through the internal discharge resistor. Work on a grounded anti-static workbench, wear an anti-static wrist strap.

Diagnostic procedure

1. Step 1 — External visual inspection. Verify AC inlet, fuse, output cable for damage. Check for melted plastic, oxidised pins, scorched markings.
2. Step 2 — Discharge + open + internal visual. After bulk cap below 5V, open the case. Look for sparking marks, swollen / leaked capacitors, burnt PCB traces, scorched components. Burnt-electronics smell on opening points to the failed component zone.
3. Step 3 — F1 fuse + AC input check. Verify F1 continuity. Blown fuse points to primary-side short — inspect IPW60R060P7 + OSG60R074HZ + G47N60EF MOSFETs in diode mode before replacing the fuse.
4. Step 4 — NTC + bridge rectifier check. Verify NTC 8D-20 resistance (~8Ω cold). Diode-mode test the AC bridge rectifier.
5. Step 5 — Primary MOSFET diode-mode check. Test each primary MOSFET drain-to-source in diode mode. Healthy MOSFET shows 0.3-0.6V drop; short = replace.
6. Step 6 — PFC controller check. Verify VCC at UCC28070APWR. If VCC present but no gate-drive output to the boost MOSFETs on oscilloscope, the IC has failed.
7. Step 7 — Gate driver check. Verify FAN3224T VCC and gate-drive output waveform. Failed FAN3224T = no LLC switching even with healthy PWM signal at the controller.
8. Step 8 — Output stage check. Verify 12V at the output terminals. Inspect 30V 820µF output filter capacitors for swelling / leakage. Measure output ripple in AC mV mode on the multimeter.
9. Step 9 — Post-repair function test. Apply AC via voltage regulator. Verify the fan spins, 12V output reaches spec, no smoke or unusual noise. Apply electronic load progressively to rated wattage. Run a 2-hour soak test at 80% rated load before considering the PSU cleared for customer use.

Complete G1286 / G1286A Replacement Unit

When chip-level repair is not the right path (multiple ICs damaged, operator needs miner back online fast, or no qualified bench tech available), LYS stocks the complete G1286 / G1286A PSU brand-new replacement unit for Innosilicon T2T 37t double-barrel. Compatible with the full T2T / T2TH / T2T+ / T2TH+ / T2THF+ / T2THL+ / T2THM / T3 / T3H Innosilicon line plus the Hummer Mars H7 miner per cross-compat listings — a single SKU covers the entire dual-tube T-series fleet.

For the sister Innosilicon G1240 PSU (different miner generation, see G1240 repair guide when refreshed), and the related G1266 PSU (also covers Innosilicon T2T / L2), repair stock cross-applies for most passive components and several active ICs.

When Chip-Level Repair Makes Sense vs Replacement

For operators running surviving Innosilicon T2T / T2TH / T2T+ / T3 units, component-level repair is the budget-conscious path. A small inventory of the cross-platform-shared components (IPW60R060P7 + FAN3224T + NTC 8D-20 + UCC28070APWR + G47N60EF + OSG60R074HZ + PBSS5240T/PBSS4240T pair) covers the majority of bench-repair scenarios. Most of these parts cross-share with Bitmain APW7 or Whatsminer P21 — a single repair bench inventory covers all three families. For operators without bench capability or running a single failed unit, the complete G1286 / G1286A replacement PSU is the faster path back to hashrate.

FAQ — Innosilicon G1286 PSU Repair

Which Innosilicon miners use the G1286 PSU?

The G1286 (also G1286A — same product, different revision label) powers the full Innosilicon dual-tube T-series: T2T, T2TH, T2T+, T2TH+, T2THF+, T2THL+, T2THM, T3, T3H at hashrates from 25T up to 50T. Cross-compat also extends to the Hummer Mars H7 miner per industry listings. With Ethereum's 2022 PoS migration killing the ETHash market, the G1286 installed base is now mostly running ETC, EthereumFair, or similar ETHash-compatible chains. Related sister PSUs in the Innosilicon T-series lineup include the G1240 (different generation, see companion repair guide) and G1266 (also covers T2T / L2 configurations).

Is the G1286 the same as the Innosilicon G1240?

No — different model. The G1240 powers a different Innosilicon miner generation with a separate BOM (uses IPW60R037P7 primary MOSFET vs the G1286's IPW60R060P7). See our companion G1240 PSU repair guide for the G1240-specific component list.

Why does the G1286 use the same FAN3224T gate driver as the Bitmain APW7?

The FAN3224T is a generic dual-low-side gate driver IC well-suited to LLC half-bridge primary stages. Both the G1286 and the APW7 are PFC + LLC half-bridge PSUs in the ~1800W single-12V-rail class, so they end up with similar gate-drive requirements. LYS's product URL explicitly names both (APW7 + G1286) to signal the cross-platform compatibility.

The original BOM lists 500V 250µF but you stock 500V 330µF — is that a problem?

The 500V 330µF capacitor is the nearest capacity-equivalent that LYS stocks for this voltage class. Slightly higher capacitance on the PFC bulk cap is electrically acceptable — it increases hold-up time and reduces ripple at the same rated voltage. The substitution does not affect PSU function. If LYS adds a 500V 250µF SKU as a Phase 2 fiche later, the exact match can be sourced.

My G1286 is dead and I cannot find a replacement — what should I do?

Component-level repair is the realistic path. Start with the diagnostic procedure in this guide — most G1286 failures localise to one or two failed primary MOSFETs, a sacrificed NTC, a failed FAN3224T gate driver, or a failed UCC28070APWR PFC controller. Contact LYS at contact@lys-sz.com for the G1286 repair parts kit or for specific failed-component sourcing.

Is the G1286 still profitable to repair in 2026?

Depends entirely on electricity cost. The Innosilicon T2T / T2T+ generation is well past its economic prime, and ETHash chains (ETC, EthereumFair) have compressed margins. In very low-power-cost regions, surviving T2T units can still earn at positive margins for another 6-12 months. Operators should evaluate per-unit per-day energy cost against per-unit per-day mining revenue before investing in PSU repair. Contact LYS for parts pricing to inform the repair-vs-retire decision.

Sourcing G1286 PSU Repair Parts

LYS Shenzhen stocks every component listed above for the Innosilicon G1286 PSU. For the 30V 820µF capacitor (currently sourced on-demand), the 500V 250µF primary bulk cap (LYS stocks 500V 330µF as the nearest capacity-equivalent), or for the broader Innosilicon T-series lineup, contact our team at contact@lys-sz.com. Cross-platform component sharing means stock of IPW60R060P7 + FAN3224T + NTC 8D-20 + UCC28070APWR covers G1286 + Bitmain APW7 + Whatsminer P21 repair scenarios from a single inventory.

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.