18836-2 Schematic Here

| Test Point | Expected Value | Failure Indication | | :--- | :--- | :--- | | | 12V - 24V | 0V = Blown fuse/trace | | EN (Pin 2) | > 2V | 0V = Microcontroller not enabling circuit | | Vout (Inductor output) | 3.3V, 5V, or 12V | 0V = Short circuit; Input voltage = FET welded shut | | FB (Pin 6) | 0.6V or 0.8V | 0V = Open feedback; >1V = Bad resistor divider |

Save this article as a reference. Download a generic 18836-2 PDF. Practice reading the circuit on a real board. Remember: When in doubt, check the feedback resistor divider; 90% of voltage faults live there. 18836-2 Schematic

Without power, put your multimeter on diode mode. | Test Point | Expected Value | Failure

If you have a device that is suspected to have a faulty 18836-2 circuit, follow this diagnostic flowchart. Remember: When in doubt, check the feedback resistor