La-h103p Schematic Now

The LA-H103P schematic is a critical technical document for engineers and technicians repairing the Lenovo IdeaPad S340-14IIL Go to product viewer dialog for this item. and S340-15IIL Go to product viewer dialog for this item.

  • Cross-reference part numbers: look up regulator, charger, EC, and VRM IC datasheets for pin functions and test voltages.
  • Use the schematic’s TP (test point) labels — many service manuals list expected voltages at these points.
  • Follow small-value resistors (current sense, shunt) and thermistor nets for battery-related faults.
  • Pay attention to pull-ups/pull-downs that determine logic default states.
  • Use continuity mode to verify connector pinouts shown on the schematic match the board.

Strengths of the Design:

Sheet 2: Main Power Rails (Always On)

  • Linear Regulators: Generate +3V_LDO and +5V_LDO for EC and standby circuits.
  • System FETs: PQ1 and PQ2 – these switch the main 19.5V to produce +3VALW and +5VALW.
  • Test Points: Look for +3VALW_EC and +5V_SUS.