Ms-16j91 Schematic: [new]

MSI laptops are notorious for BIOS corruption. The schematic tells you:

| | Typical Cause(s) | Solution | |---|---|---| | No power, no LED | Blown input MOSFETs, faulty charger IC, dead battery management unit | Check voltages on charging connector and MOSFETs; test PR214 resistor (1.8k ohms). | | Triggered but no POST (no video) | Corrupt BIOS, failed EC, missing power rail | Reflash BIOS; verify EC conditions; check for +3V_LCD. | | Dedicated GPU not detected | Missing 1.8V_MAIN rail | Trace the power path from the charging IC to the GPU. | | Laptop shuts off randomly | CPU over-temperature, faulty VRM, cracked solder joints | Monitor CPU temperature; check power management IC signals. | | Keyboard backlight not working | Damaged ribbon cable, blown LED driver | Test ribbon cable continuity; locate backlight driver IC on schematic. | ms-16j91 schematic

In some MSI GP72VR models with upgrade screens, display issues can also arise from using the wrong LVDS cable (40- to 40-pin vs. 40- to 30-pin). The motherboard is not detecting the display, resulting in a blank screen. MSI laptops are notorious for BIOS corruption