Boardview software allows you to search for PR301 and highlights its exact location.
The primary voltage distribution rail originating from the DC jack or the battery pack (via the charging circuit).
The SoC releases the sleep state signals: SLP_S5# , SLP_S4# , and SLP_S3# . As these lines go high, they act as enables for the remaining voltage regulators on the motherboard ( +1.2V , +1.0V , and eventually +VCC_CORE ). Step 5: Power Good and Reset
Locate the +3VALW and +5VALW step-down regulator (often a Richtek or Texas Instruments IC).