Laptop Motherboard Voltage Rails Explained | Power Rails for Fast Diagnosis🔌

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Understanding voltage rails is essential for anyone repairing laptop motherboards. In this video, I’ll walk you through the most common power rails like +3VALW, +5VALW, VCC_CORE, and others, explaining their roles, when they should be ON, and how to test them. This knowledge will help you troubleshoot no power, no display, and boot loop issues quickly and accurately.

🔧 What You’ll Learn:
✅ What voltage rails are and why they matter
✅ When each rail should be active (S0, S3, S5)
✅ Common failures related to voltage rail problems

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