If the system aborts power-up and shuts down within half a second, use an oscilloscope or the max-hold function on a multimeter to check which voltage rail fails to rise during that brief window. The component directly attached to the failing rail is your primary fault suspect.
[DC Jack / Battery] ──> [Input MOSFETs] ──> [Main 19V/12V Rail] ──> [3V/5V Standby IC] ──> [EC / Power Button] Step 1: Visual Inspection e89382 hannstar j mv-4 94v-0 schematics
: Look for leaky MOSFETs, blown capacitors, or faulty inductors near the CPU and GPU area. If the system aborts power-up and shuts down