HOW TO DIAGNOSE POWER RAILS FAULTS
📏 Normal Impedance Ranges (Measured in Ohms)
When checking rails with a multimeter in resistance mode (board unpowered):
⚠️ Key Diagnostic Notes
- Low resistance (<1 Ω) on CPU/GPU rails is normal for modern processors due to high transistor density. Don’t mistake this for a short unless it’s near 0 Ω.
- Compare with known-good boards: impedance varies slightly by design and manufacturer.
- Always measure in diode mode for confirmation: typical forward bias readings for CPU/GPU rails are 0.2–0.4 V.
- Abnormal signs: sudden drop to near 0 Ω on standby rails (+3VALW, +5VALW) usually indicates a shorted capacitor or MOSFET.
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