Learn step-by-step diagnostic techniques for troubleshooting power issues in a Lenovo Y700 laptop through this detailed repair tutorial video. Follow along as an experienced electronics repair specialist demonstrates how to diagnose problems with the BQ24780S power management IC and IT8371E embedded controller, identifying common failure points and testing procedures. Master essential voltage testing methods, component-level diagnostics, and proper troubleshooting sequences that can be applied to similar laptop power issues.