Always keep your multimeter ground lead on a solid screw hole or shielding.
Check the two DC-in MOSFETs near the charging port. They often short, preventing the 19V rail from reaching the rest of the board.
Map out 19V (B+), 3.3V/5V Alw, and RAM voltage.
Usually utilizes the ISL or BQ series for battery management.
💡 If you can't find a component labeled on the board, search the schematic for the "PU" (Power Unit) or "PQ" (Power Quarter/Transistor) number to find its functional group. If you'd like, I can help you further if you tell me:
On versions with USB-C charging, the controller IC can fail due to surges. How to Use the Schematic with a Boardview
Ensure your board is actually the LA-H103P. Check the silk-screened text near the RAM slots.
Often uses an ENE or Microchip SMSC controller for power sequencing. Why You Need the Schematic
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.
Always keep your multimeter ground lead on a solid screw hole or shielding.
Check the two DC-in MOSFETs near the charging port. They often short, preventing the 19V rail from reaching the rest of the board.
Map out 19V (B+), 3.3V/5V Alw, and RAM voltage. lah103p schematic new
Usually utilizes the ISL or BQ series for battery management.
💡 If you can't find a component labeled on the board, search the schematic for the "PU" (Power Unit) or "PQ" (Power Quarter/Transistor) number to find its functional group. If you'd like, I can help you further if you tell me: Always keep your multimeter ground lead on a
On versions with USB-C charging, the controller IC can fail due to surges. How to Use the Schematic with a Boardview
Ensure your board is actually the LA-H103P. Check the silk-screened text near the RAM slots. Map out 19V (B+), 3
Often uses an ENE or Microchip SMSC controller for power sequencing. Why You Need the Schematic
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.