How Would I Measure If Power Is Running Through Mainboard Macbook Air 13 Early 2015

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I wanna figure out, if power is running through the mainboard when i have my charger in - could anyone help?

What does the MagSafe charger LED telling you? Is it Amber or Green or not lighting up at all? Beyond that you’ll want to make sure your MagSafe charger is healthy and the MagSafe port on your system is clean. Review this Apple T/N Apple Portables: Troubleshooting MagSafe adapters The last aspect is to take the bottom cover off and probe the power lines with a DVM by disconnecting the logic board connector and testing the voltage