Corrupt BIOS data is a frequent cause of "lights on, no display." Use the schematic to find the SPI Flash chip pins for reprogramming.
See exactly which signal triggers the next step in the boot process. lah103p schematic new
Always keep your multimeter ground lead on a solid screw hole or shielding. Corrupt BIOS data is a frequent cause of
Locate specific pads to measure signals like RSMRST# or PWRBTN# . Key Areas to Check on LA-H103P lah103p schematic new
Look for the "Always On" controller. If this IC is hot or missing its LDO outputs, the laptop will appear completely dead.
Map out 19V (B+), 3.3V/5V Alw, and RAM voltage.
Use a lab power supply to inject voltage safely if you find a short circuit.