F4901 1.1a 24v Schematic -

F4901 1.1A 24V Schematic — Overview and Guidance

What it likely is

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Failure 1: Dead Output (0V) – No sign of life

• Check: F1 (fuse). If open, suspect shorted Q1 (MOSFET) or DB1 (bridge).
• Fix: Replace Q1 (4N60 or equivalent like 2N60), DB1 (KBP210), and the fuse. Always check R3 (0.68Ω) – it often opens when Q1 fails.

📌 Visual Reference: You can find the exact placement of this component by searching for the Wistron "Queen" or "Hummingbird" motherboard schematics, specifically looking at the USB or LCD Connector pages. F4901 1