Innosilicon G1240 Power Supply Unit Repair Guide & Components List
The Innosilicon G1240 (also marketed as G1240A — same product, different revision label) is the legacy single-barrel PSU for the Innosilicon T2T / T2Tz mining family, sized for ~30-32T hashrate configurations and pulling under 1000W per unit. Built around the TI UCC28070APWR interleaved dual-channel PFC controller with IPW60R037P7 76A / 650V CoolMOS primary switching and the SRC60R090B super-junction power MOSFET on the LLC half-bridge, the G1240 is the entry-tier sibling to the dual-barrel G1286 PSU (which powers larger T2T+ / T3 50T configurations). This guide covers the 10 most vulnerable G1240 components, the Innosilicon T-series PSU model mapping (G1138 / G1240 / G1266 / G1286 / G1306), the complete G1240/G1240A replacement unit, and the full repair playbook with direct sourcing links.
Why Innosilicon G1240 PSU Repair Matters in 2026
The G1240 is end-of-life territory in 2026 — Innosilicon's T-series volume was smaller than Bitmain or MicroBT, and the 2022 Ethereum PoS migration killed the primary ETHash market. What remains of the G1240 installed base is operators running surviving Innosilicon T2T / T2Tz units on ETC, EthereumFair, or similar ETHash-compatible chains in cheap-power regions. New G1240 PSUs are constrained on the secondary market — LYS still stocks complete G1240/G1240A brand-new replacement units (single-barrel T2T 30t configuration), and component-level repair on failed units is the budget-conscious path. The G1240 shares several key ICs with the G1286 (UCC28070APWR + NTC 8D-20) and with Bitmain / Whatsminer PSUs (IPW60R037P7 with similar Infineon CoolMOS variants in P21; NTMFS5C430NL secondary MOSFET cross-shared with Whatsminer P21) — so a repair bench already stocking parts for the other PSU families covers most G1240 failures with minimal incremental inventory.
Innosilicon T-Series PSU Model Mapping
The Innosilicon T-series PSU lineup pairs each PSU model with specific miner generations. The mapping documented across industry PSU/hashboard tester references:
| Innosilicon PSU | Paired miner generation | Architecture positioning |
|---|---|---|
| G1138 | T2 | Legacy single-barrel |
| G1240 / G1240A | T2Tz / T2T (~30-32T single-barrel) | Entry-tier single-barrel for sub-1000W loads |
| G1266 / G1266A | T2Th | Mid-tier single-barrel |
| G1286 / G1286A | T2Th+ (dual-barrel, 25-50T) | Upper-tier dual-barrel for >1000W loads — see G1286 repair guide |
| G1306 | T3 series | T3-generation successor |
The key practical distinction: G1240 = single-barrel (smaller-hashrate T2T/T2Tz miners pulling under 1000W); G1286 = dual-barrel (larger T2T+/T3 miners at 25-50T pulling over 1000W). Operators with a mixed Innosilicon T-series fleet typically need both G1240 and G1286 spares.
G1240 PSU Cross-Platform Repair-Stock Sharing
The G1240 shares several key ICs with other crypto miner PSUs — a repair bench already stocking parts for the G1286 or Bitmain APW7 / Whatsminer P21 PSUs covers most G1240 failures:
- UCC28070APWR PFC controller: cross-shared with the G1286 PSU (same TI dual-channel interleaved PFC controller class)
- NTC 8D-20 thermistor: cross-shared with G1286 + Innosilicon + Whatsminer PSU families
- NTMFS5C430NL secondary MOSFET: cross-shared with the Whatsminer P21 PSU (used in synchronous rectification stages)
- 500V 330µF primary bulk capacitor: cross-shared with G1286 and generic SMPS designs in this voltage class
- GBU608 bridge rectifier: cross-shared with Whatsminer PSU lineup (per LYS product URL naming)
- IPW60R037P7 primary MOSFET: G1240-specific Infineon CoolMOS P7 variant (37mΩ RDSon, 76A / 650V) — distinct from the IPW60R060P7 (60mΩ RDSon) used on G1286 and Whatsminer P21
- SRC60R090B super-junction power MOSFET: G1240-explicit per LYS product URL
The G1240-specific components (SRC60R090B, IPW60R037P7-specific MOSFET, CGC1S06510 SiC diode, GBU2510 bridge) are the components that don't cross-apply — but a single repair bench inventory still covers ~70% of G1240 failures from existing G1286 / Bitmain APW7 / Whatsminer P21 stock.
G1240 PSU Architecture at a Glance
The G1240 (also G1240A — same product, different revision label) is a PFC-fronted LLC half-bridge switching supply with interleaved dual-channel PFC, positioned as the single-barrel entry-tier Innosilicon T-series PSU:
- AC input: universal range typical for this PSU class (160-264V AC Active PFC, similar to G1286)
- DC output: 12V single-rail, designed to support sub-1000W loads (typical single-barrel T2T/T2Tz at 30-32T)
- Output connectors: standard 6-pin GPU + 4-pin CPU power connectors (consumer PSU-style, same format as G1286)
- Input protection: F1 fuse + NTC 8D-20 inrush thermistor
- Bridge rectifier: GBU608 6A single-phase (cross-shared with Whatsminer) + GBU2510 25A single-phase (higher-current variant)
- PFC stage: UCC28070APWR dual-channel interleaved PFC controller driving the IPW60R037P7 (76A / 650V CoolMOS P7) primary boost MOSFETs. The 500V 330µF bulk capacitor holds the PFC bus.
- LLC half-bridge primary switching: SRC60R090B super-junction power MOSFET on the LLC primary stage (G1240-explicit per LYS product URL)
- Secondary stage: synchronous rectification on the secondary side feeds the 12V output bus. NTMFS5C430NL (RKF7K) single N-channel power MOSFET on the sync rectification stage (cross-shared with Whatsminer P21).
- Output filtering: 20V 820µF (10mm) secondary-side electrolytic capacitors handle output filtering.
- Auxiliary support: CGC1S06510 silicon-carbide diode (Cengol) on the auxiliary rectification path. Note: original LYS BOM labelled this as "MOSFET" but the LYS product page confirms it is a SiC Schottky diode.
G1240 PSU Repair Components List
The table below lists every component LYS Shenzhen stocks for G1240 PSU repair. Each entry links directly to the corresponding part page — contact us at contact@lys-sz.com for the 20V 820µF (10mm) and GBU2510 bridge rectifier (currently sourced on-demand).
| Part Number | Component Type | Typical Position / Role |
|---|---|---|
| GBU608 | Bridge rectifier | 6A single-phase high-performance — AC input rectification (cross-shared with Whatsminer) |
| GBU2510 | Bridge rectifier | 25A single-phase — higher-current AC input rectification (contact us for stock check) |
| SRC60R090B | Super-junction power MOSFET | 600V N-channel — LLC half-bridge primary switching (G1240-explicit URL) |
| IPW60R037P7 | N-channel MOSFET | 76A / 650V Infineon CoolMOS P7 (37mΩ RDSon) — PFC boost MOSFET. Note: original BOM listed IPW60R060P7 (60mΩ); LYS confirms G1240 specifically uses the 037P7 fast-switching variant. |
| CGC1S06510 | SiC Schottky diode | Silicon-carbide diode (Cengol) — auxiliary rectification. Note: original BOM mislabelled as "MOSFET"; LYS confirms diode. |
| UCC28070APWR | PFC controller | TI UCC28070A dual-channel interleaved PFC controller (cross-shared with G1286) |
| NTC 8D-20 | Power thermistor | 8Ω inrush current limiter at AC turn-on (Innosilicon + Whatsminer shared) |
| 20V 820µF (10mm) | Electrolytic capacitor | Secondary-side output filtering — contact us for stock check |
| 500V 330µF | Electrolytic capacitor | Primary DC bus bulk after PFC stage (cross-shared with G1286) |
| NTMFS5C430NL (RKF7K) | N-channel power MOSFET | Synchronous rectification on secondary side (cross-shared with Whatsminer P21) |
Complete G1240 / G1240A 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 G1240 / G1240A PSU brand-new replacement unit for Innosilicon T2T 30t single-barrel. Compatible with the T2T / T2Tz single-barrel Innosilicon configurations.
For dual-barrel T2T+ / T3 25-50T configurations requiring more output power, see the higher-tier G1286 / G1286A PSU repair guide.
Most Common G1240 PSU Failure Modes
- PSU dead — no output, fan not spinning — check the F1 input fuse first. Blown fuse points to a downstream primary-side short. Diode-mode test on the IPW60R037P7 + SRC60R090B primary MOSFETs to localise the short.
- PFC controller failure (no PFC bus voltage) — failed UCC28070APWR stops the interleaved PFC stage from boosting. Check VCC at the IC and gate-drive output to the IPW60R037P7 MOSFETs.
- Primary MOSFET short (IPW60R037P7 / SRC60R090B) — failed IPW60R037P7 or SRC60R090B presents as a hard short and usually takes the F1 fuse. Diode-mode test confirms.
- Secondary sync rectification failure — failed NTMFS5C430NL (RKF7K) on the secondary stage produces low or unstable 12V output. Diode-mode test the MOSFET in-circuit.
- AC bridge rectifier short from dust / surge — GBU608 or GBU2510 bridge can short after dust accumulation creating a leakage path. Replace the bridge, install protective bushings on the 4 pins, apply fresh thermal paste between the bridge and heatsink.
- 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.
- SiC Schottky diode failure (CGC1S06510) — failed CGC1S06510 on the auxiliary rectification path can cascade into auxiliary rail issues. Diode-mode test confirms.
- Output ripple high under load — degraded 20V 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 330µF primary bus capacitor produces ripple on the PFC output.
Diagnostic Workflow
Bench setup
- AC voltage regulator (0-265V output) for startup verification.
- Electronic load 1000W+ for full-load testing (G1240 is sub-1000W class — smaller bench load than G1286 / APW7 / P21).
- 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).
- 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. 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. Work on a grounded anti-static workbench.
Diagnostic procedure
- Step 1 — External + internal visual inspection. After bulk cap discharge, open the case. Look for swollen / leaked capacitors, scorched PCB, burnt-electronics smell zones.
- Step 2 — F1 fuse + AC input check. Verify F1 continuity. Blown fuse points to primary-side short.
- Step 3 — NTC + bridge rectifier check. Verify NTC 8D-20 resistance (~8Ω cold). Diode-mode test the GBU608 + GBU2510 AC bridge rectifiers.
- Step 4 — Primary MOSFET diode-mode check. Test IPW60R037P7 + SRC60R090B drain-to-source in diode mode. Healthy MOSFET shows 0.3-0.6V drop; short = replace.
- Step 5 — PFC controller check. Verify VCC at UCC28070APWR. If VCC present but no gate-drive output on oscilloscope, the IC has failed.
- Step 6 — Secondary stage check. Diode-mode test the NTMFS5C430NL sync rectification MOSFET. Inspect 20V 820µF output filter capacitors for swelling / leakage. Measure output ripple in AC mV mode.
- Step 7 — Auxiliary rectifier check. Diode-mode test the CGC1S06510 SiC Schottky on the auxiliary path.
- Step 8 — Post-repair function test. Apply AC via voltage regulator. Verify fan spins, 12V output reaches spec, no smoke. Apply electronic load progressively to rated wattage. Run a 2-hour soak test at 80% rated load before clearing for customer use.
When Chip-Level Repair Makes Sense vs Replacement
For operators running surviving Innosilicon T2T / T2Tz units, both paths are available — LYS stocks the complete G1240/G1240A replacement unit AND the chip-level BOM. The choice depends on operator economics:
- Chip-level repair is the budget path when the failure is localised (one or two failed MOSFETs, sacrificed NTC, single capacitor swap) and operator has bench skill + equipment. Cross-platform stock sharing with G1286 + Bitmain APW7 + Whatsminer P21 amortises the inventory cost.
- Complete G1240 / G1240A replacement is the right path when multiple ICs are damaged, when the failure cannot be localised quickly, or when operator needs the miner back online fast without bench tech availability.
FAQ — Innosilicon G1240 PSU Repair
Which Innosilicon miners use the G1240 PSU?
The G1240 (also G1240A — same product, different revision label) powers the Innosilicon T2T / T2Tz single-barrel configurations at ~30-32T hashrate (sub-1000W per unit). Per industry PSU/hashboard tester mapping references, G1240 is paired specifically with T2Tz. Cross-compat extends to T2T units at similar hashrate. For larger dual-barrel T2T+ / T3 (25-50T at >1000W), the higher-tier G1286 / G1286A is the correct PSU.
What is the difference between G1240 and G1286?
G1240 = single-barrel, sub-1000W class, paired with T2T / T2Tz. G1286 = dual-barrel, >1000W class, paired with T2T+ / T2Th+ / T3 at 25-50T. Both share the UCC28070APWR PFC controller and NTC 8D-20 inrush thermistor; they differ on primary MOSFET (G1240 uses IPW60R037P7 76A/650V; G1286 uses IPW60R060P7 600V/48A) and output capacity. Operators with mixed Innosilicon T-series fleets typically need both PSU spares.
The original BOM lists IPW60R060P7 — but you stock IPW60R037P7 for the G1240. Which is correct?
LYS stocks the IPW60R037P7 (76A / 650V Infineon CoolMOS P7, 37mΩ RDSon) as the G1240-specific primary MOSFET — the LYS Phase 2 fiche explicitly names "innosilicon-power-supply-g1240-repair" in the slug, confirming this is the G1240 BOM variant. The IPW60R060P7 (60mΩ RDSon variant) is used on the G1286 and Whatsminer P21 PSUs. The original LYS article BOM likely referenced the IPW60R060P7 as a cross-platform fit, but the IPW60R037P7 is the correct G1240-specific replacement.
The original BOM lists CGC1S06510 as "MOSFET" — what is it actually?
CGC1S06510 is a silicon-carbide (SiC) Schottky diode from Cengol, used on the G1240's auxiliary rectification path. The original LYS article BOM mislabelled it as a MOSFET; the LYS product page confirms it as a SiC diode. The diagnostic procedure is different — test in diode mode against the expected forward voltage drop (~1V for SiC), not against the MOSFET source-drain junction.
My G1240 is dead — what should I check first?
Visual check the F1 input fuse (blown = downstream primary short). Smell test for burnt-electronics odour. Then diode-mode test the IPW60R037P7 + SRC60R090B primary MOSFETs — these are the most common primary failure points. If primary checks healthy, move to the UCC28070APWR PFC controller VCC + gate-drive verification on the oscilloscope.
Is the G1240 still profitable to repair in 2026?
The G1240's installed base is small (smaller Innosilicon fleet vs Bitmain/MicroBT) and the ETHash market is dead since the 2022 Ethereum PoS migration. Surviving T2T / T2Tz units on ETC / EthereumFair earn modest margins in low-power-cost regions. For single-component failures (one MOSFET, one cap), chip-level repair is cheap and worthwhile. For multi-IC failures, the complete G1240/G1240A replacement unit is the faster path — operator should evaluate per-unit-per-day energy cost vs mining revenue before investing in either repair or replacement.
Sourcing G1240 PSU Repair Parts
LYS Shenzhen stocks every component listed above for the Innosilicon G1240 PSU plus the complete G1240/G1240A brand-new replacement unit. For the 20V 820µF (10mm) capacitor and GBU2510 25A bridge rectifier (currently sourced on-demand), or for the broader Innosilicon T-series PSU lineup (G1138, G1266, G1286, G1306), contact our team at contact@lys-sz.com. Cross-platform component sharing means stock of UCC28070APWR + NTC 8D-20 + NTMFS5C430NL + 500V 330µF + GBU608 covers G1240 + 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.
