Usually generated by a dedicated PMIC (often a TPS-style controller) to power the EC (Embedded Controller) and start the boot sequence. Secondary/Run Rails: +1.2V (DDR4): Power for memory modules. +1.0V / +1.8V: Core logic and PCH standby voltages.
Checking the standby power section, which is a common failure point on these Lenovo motherboards. Charging Circuit: la-h103p schematic
Understanding the schematic allows us to predict where the LA-H103P typically fails: Usually generated by a dedicated PMIC (often a
The schematic helps trace the 19V (B+) rail from the power jack through protection diodes and MOSFET switches to the current sense resistor. Checking the standby power section, which is a
Supports DDR4 RAM, often with 4GB soldered to the board and one SO-DIMM slot for upgrades up to 12GB or 20GB total.
The LA-H103P does not use a traditional charger IC like the BQ24780. Instead, it uses a (e.g., TPS65987 or CYPD5225). The schematic reveals: