When the downstream circuit draws less than 1.1A, the F4901 remains in its low-resistance state (often fractions of an ohm). Power flows cleanly from the source to the load. Overcurrent Fault
F4901 (PPTC) [ 1.1A ] +---++---+ D1 (TVS) C1 (Bypass) Vin ------| |-------+-------+--------+------ Vout (To Load) (24V DC) +--------+ | | _|_ _|_ --- \ / D2 (LED Indicator) /\ --- | /___\ | [R1] (2.2kΩ Resistor) | | | GND -----------------------+-------+-------+------ GND Use code with caution. Circuit Nodes and Component Descriptions:
SMD 1206 or similar surface-mount footprints. f4901 1.1a 24v schematic
Sourced from a regulated switch-mode power supply (SMPS).
Polytronics (e.g., SMD1206P110TFT) or Tyco Electronics (Raychem). Technical Schematic Context When the downstream circuit draws less than 1
This guide will explain what this component is, its typical applications, how to use a schematic to find and test it, and how to perform a DIY repair.
Factory motherboards utilize high-melting-point lead-free solder. Apply a small amount of premium flux and mix in leaded solder to lower the overall melting point before attempting component removal. Circuit Nodes and Component Descriptions: SMD 1206 or
In laptop motherboard topologies (e.g., Sandy Bridge/Ivy Bridge UMA/Muxless configurations), is placed immediately before the LVDS / LCD Connector . It handles the high-voltage power rail required to run the display's inverter board or internal LED backlight strip. The Schematic Architecture Path
: The letter 'F' indicates a Fuse . On complex multilayer motherboards (such as those engineered by Wistron, Compal, or Quanta), the number 4901 is a unique location code assigned by the hardware designer. It helps technicians pinpoint the component's exact layout position using a Boardview file.