Delta Electronics, Inc. DPS-400LB.B power supply Repair Service

Professional diagnostic and board-level repair service for this Delta Electronics, Inc. DPS-400LB.B power supply.

Delta DPS‑400LB.B is a 400 W mini‑ATX switching power supply used in servers and industrial control enclosures. Common failure modes include electrolytic capacitor burn‑out on the input or output stages, dropout of the +5V/12V rails due to degraded MOSFETs or rectifier diodes, and fan or heat‑sink overheating that can trigger thermal shutdown. First‑check diagnostics: verify 120 VAC/240 VAC input voltage and polarity; measure the +5V, +12V, and +3.3V outputs with a multimeter while the unit is powered on; inspect for bulging or leaking capacitors and ensure the fan spins freely and heatsink fins are clean. Post Comment

Need your Delta Electronics, Inc. DPS-400LB.B power supply repaired?

Ship your unit to our North Carolina repair shop for component-level diagnostics and a repair estimate. We service industrial control electronics and power systems nationwide.

• ⚙️ Board-level diagnostics – Troubleshooting beyond simple module replacement
• 🔁 Clear approval process – No repair begins without your approval
• 🧰 Expert Technicians – Decades of board-level experience
• ✅ 1-Year Warranty – Included with completed repairs

Start a Repair Request   Call 1-336-969-0110

Nationwide service • Industrial-grade testing • 1-year warranty on completed repairs

Owner-Operated • Practical Pricing • 1-Year Warranty • Nationwide Service

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