Antminer L3+ U73 Step-Down Power Module DC Board LM27402S
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Antminer L3+ U73 Step-Down Power Module – LM27402S Voltage Regulator (Green Version)
Restore the 10 V step-down rail on your Antminer L3+ hashboard with this green-PCB U73 replacement module. Built around the LM27402S synchronous buck controller, it replaces the damaged on-board power circuit and brings the voltage domain back to spec — getting your Scrypt miner hashing again without a full board swap.
Flexible 3-Wire or 4-Wire Installation
The module has 8 external solder joints: four connect directly to pads without wire bridges, and the remaining points accept either 3 wires (fixed voltage via PIC) or 4 wires (adjustable voltage via PIC), depending on your board revision and repair preference. An 8-step installation guide covers resistor removal, signal routing, and connection to the correct inductor and feedback pins on the hashboard.
Connection Pin-Out Reference
Solder points: GND, 12 V input, EN (power-on enable), HG & LG (MOS gate drives), DAOUT (PIC voltage adjustment), FB(mos) (inductor feedback), and SW(out) (switched output). Match each label to the silk-screen markings on your L3+ board before soldering.
L3+ U73 Green Module Specifications
| Parameter | Value |
|---|---|
| Compatibility | Antminer L3+ |
| Board Area | U73 |
| Function | 10 V step-down (buck) circuit control |
| Reference Chip | LM27402S / 27402S |
| PCB Colour | Green |
| Solder Joints | 8 external (4 pad-only + 3 or 4 wired) |
| Lead Time | 3–14 days |
| MOQ | 10 pieces |
| Condition | New |
Related L3+ Hashboard Repair Components
- L3+ U73 Step-Down Module (Black Version)
- LM27402S Switching Controller IC
- L3+/S9 14 V Boost Module (Green Version)
- L3+ Hashboard Test Fixture & Chip Scanner
Need L3+ repair modules in bulk? Contact us at contact@lys-sz.com for volume pricing and lead-time estimates.
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