Boot-loop diagnosis
Use reset reason and a minimal firmware image to isolate repeated restarts.
Medium riskAll boards
Tools checklist
- Digital multimeternUSB data cablenCurrent-limited bench supplynLogic analyser or oscilloscope when indicated
Symptom-to-checkpoint workflow
Start at checkpoint 1. Record the reading, then choose Pass or Fail to follow the correct branch.
Record this diagnostic run
Log in to save measurements and submit this run to an instructor.
Disconnect power before wiring changes or continuity testing. Confirm polarity and voltage limits. Use a current-limited supply for suspected shorts.