In a schematic requiring a throughput at 24V , the F4901 acts as a "sacrificial" link. Its primary purpose is to protect downstream components—such as sensitive microcontrollers or motor drivers—from damage caused by short circuits or power surges. If the current exceeds its rated threshold (often specifically matched to the 1.1A load), the fuse filament melts, safely breaking the circuit. 2. Strategic Placement in Schematics
📌 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 1.1a 24v schematic
Use a multimeter in continuity mode. A healthy F4901 should show very low resistance (near 0 ohms). High resistance or an "open" reading indicates the fuse has tripped or failed. In a schematic requiring a throughput at 24V