The external charger supplies 19V into the +VIN rail via two isolation protective MOSFETs. The EC monitors the ACIN pin to verify a genuine HP power source is present.
The KB9022Q or similar EC controls the power sequence, fan speed, and keyboard/touchpad. The BIOS chip ( ) must communicate with the EC for the laptop to boot. Where to Find the ASL50 LAC921P Schematic asl50 lac921p rev 10 schematic exclusive
| Component | Common Options | Notes | | :--- | :--- | :--- | | | Intel Core i7-6500U (2.5GHz, Turbo up to 3.1GHz) | Soldered directly to the motherboard. | | | Intel Core i5-6200U (2.3GHz, Turbo up to 2.8GHz) | Soldered directly to the motherboard. | | Graphics (GPU) | Integrated Intel HD Graphics 520 | Most common configuration. | | | Discrete AMD Radeon R5 M330 (2GB) | A separate dedicated graphics chip was available on some variants. | | Memory | 2 x DDR3L SODIMM Slots | Supports low-voltage DDR3 RAM (1.35V). Standard for this era. | | Chipset | Intel HM86 or Integrated into CPU | The specific chipset can vary by CPU. | | Storage | 1 x SATA 2.5" HDD/SSD | For a traditional 2.5-inch hard drive or solid-state drive. | | Key Part Numbers | 828188-601, 828185-001, 828895-601 | Various manufacturer part numbers for replacement boards. | The external charger supplies 19V into the +VIN
ASL50 LAC921P REV 10 Schematic: Exclusive Guide for HP Notebook 15-ac Repair When a HP Notebook 15-ac Go to product viewer dialog for this item. The BIOS chip ( ) must communicate with
The schematic is the key to unlocking the secrets of this motherboard. This section will guide you on where to look for it and how to use other essential resources.
Check the charging MOSFETs responsible for isolating the battery rail ( BATT+ ) from the main system rail. Finding and Using the Schematic