: Use the schematic to find the name of the power rail you are testing (e.g., 3V or 5V lines).
The HP ProBook 4540s is a tank of a laptop, but its DC-in circuitry and power management are delicate. While a schematic gives you the theory of operation, For anyone serious about component-level repair on this platform, the mantra is simple: No boardview? No repair. hp probook 4540s boardview work
: Boardview software allows you to visualize every trace and connection on the Go to product viewer dialog for this item. : Use the schematic to find the name