The "heart" of the laptop is the power sequence. The schematic will typically start with the main power section.
Whether you are a professional in a phone/laptop repair shop, an IT asset disposition (ITAD) technician, or an electronics hobbyist, having this schematic saved offline can save hours of guesswork. Bookmark reliable sources, invest time in understanding power sequences, and always cross-reference with the boardview.
(often referred to under the project names ZPL40, ZPL50, or ZPL70). Core Technical Details Motherboard Model: Compal LA-B181P Platform Architecture: Intel Broadwell/Haswell (U-Series CPUs) Common File Types: You will typically find these in format (schematic) and format (Boardview). Where to Access Schematics While HP provides official Maintenance and Service Guides
| | Voltage | Generated By | Used For | | :--- | :--- | :--- | :--- | | VIN | 19V | AC Adapter / Battery | Main input | | +5V_ALW | 5V | TPS51225 (PU5) | Always-on for EC, USB charging | | +3.3V_ALW | 3.3V | TPS51225 (PU5) | Always-on for BIOS, EC, PCH VCCRTC | | +1.35V | 1.35V | RT8207 (PU7) | DDR3L RAM | | +VCC_CORE | Variable (0.8–1.2V) | NCP6132 (PU2) + MOSFETs | CPU core | | +VCC_GFX | Variable (0.7–1.1V) | Same as core but separate phase | iGPU |
