HP 840 G3 Not Turning On With Battery – Diagnostic & Repair Attempt (Part 1)

YouTube Description (Highly SEO Optimized) In this video (Part 1), we begin a full repair attempt on an HP EliteBook 840 G3 that is not powering on with the battery and is not charging. I take you step by step through the initial diagnostics, common failure points, and board-level checks used to identify what’s causing the HP 840 G3 to remain completely dead. 🔍 What This Video Covers: Symptoms: No power, no lights, not charging Checking battery circuitry & charging IC behavior Power rail inspection (VIN, 3V/5V, adapter detection) MOSFET testing and short detection Common HP 840 G3 motherboard failure points First stage diagnosis before deeper board-level repair 🛠️ Tools & Methods Used: Multimeter resistance & voltage checks Bench power supply Thermal camera (if needed during diagnosis) Board-level component tracing 🎯 Who This Video Helps: Laptop repair technicians Electronics students Anyone troubleshooting HP EliteBook 840 G3 charging issues Viewers who want to learn board-level laptop repair