While the exact pinout can vary slightly between OEM versions (e.g., Rohm, STMicro, or Matsushita variants), a standard 36‑pin or 48‑pin QFP package follows a logical pattern.
The circuit is divided into several critical stages identified in technical diagrams: 17IPS72P Power Supply Schematic | PDF - Scribd 17ips72 schematic work
"LA-L152P Rev 1.0 schematic" filetype:pdf "Lenovo Legion 5 17ACH6 boardview" While the exact pinout can vary slightly between
This report details the schematic work performed on the 17ips72 circuit board. The primary objective was to map the circuit topology to facilitate troubleshooting and component-level repair. The board is an Integrated Power Supply (IPS) unit, combining an AC-DC switching power supply with a DC-AC inverter stage to drive the Cold Cathode Fluorescent Lamps (CCFLs) of a 17-inch LCD display. The schematic work successfully identified the main power rails, feedback loops, and protection mechanisms. The board is an Integrated Power Supply (IPS)
Assuming 3.3V and 5V are present, press the power button. Does PWRBTN#_EC toggle? Probe pin 36 of the EC (IT8226VG). No toggle? Bad power button board (check connector JEC1 using boardview).
I see three recurring hardware failures on the 17IPS72. Without a schematic, you are guessing.