17ips72 Schematic Work Link

: Measure the 12V and 5V output rails to ensure they are stable and within spec. Further Exploration

Measure +3VALW at C2302 (near the PCH). If 0V, go to Page 4 (Power tree). See +3VALW is made by PU201. Check Pin 7 (VIN) = 19V. Pin 6 (EN0) = 3.3V. If EN0 is missing, trace back to PWR_SRC_DIV through resistors PR213/PR214. 17ips72 schematic work