The main system power rail, originating from the charging port. It passes through two protective N-channel isolation MOSFETs managed by the charging IC (commonly an ISL or BQ series controller) before establishing the main system rail, often labeled +19V_MAIN or B+ .
If a trace is blown, you can use the boardview to find alternate points (test points) to jump a wire. brittle mb 152561 boardview
Boardview files are used extensively in repair shops, hardware engineering labs, and educational settings. They allow technicians to: The main system power rail, originating from the