High-current, low-voltage rails that power the CPU cores and integrated GPU.
LA-E801P Rev 2.0 (also known by the Compal project names ) is a motherboard used primarily in HP 15-bs series laptops. The schematic details the electrical architecture for boards featuring Intel 6th (Skylake) 7th Generation (Kaby Lake) U-series processors Core System Architecture Processor Support : Integrated Intel Skylake-U or Kaby Lake-U (15W) SoC.
[19V DC-In Adapter] ──> [+19V_VIN] ──> [+3VALW / +5VALW Buck Converter] │ ┌────────────────────────────────────────┴────────────────────────────────────────┐ ▼ (S5 State) ▼ (S3 State) [+3V_EC / Power Button Active] ──> [EC Triggers PM_PWRBTN# to SoC] ──> [SoC Releases SLP Signals] ──> [+1.2V DDR4 VRAM Rail] │ ▼ (S0 Full Power State) [+1.0V PCH] ──> [+VCC_CORE] ──> [+VCC_GT] The Primary Voltage Rails
Check VIN at the main current-sensing resistor. If 19V is missing, look at the first two input MOSFETs. They often short out or fail to receive a gate voltage from the charging IC (often a BQ-series chip like BQ24780S ). la-e801p rev 2.0 schematic
Alex hit the power button. The fan spun a lazy circle, then roared to life. On the screen, the Dell logo flickered into existence. The LA-E801P was no longer a brick; it was a computer again.
Verify that the IC receives its main power supply hookup ( VIN ) at its dedicated pin.
The is more than a PDF—it is a diagnostic partner. Whether you are a professional at a repair shop or a student learning micro-soldering, this document transforms random guesswork into precision engineering. High-current, low-voltage rails that power the CPU cores
Shows logic relationships, component ratings, and voltage node structures.
: Realtek RTL8111HSH Gigabit or RTL8166EH 10/100 Ethernet controller. HP Support Community Power Rail Analysis & Troubleshooting
) if the chip is shorted, allowing the laptop to run on integrated graphics. Troubleshooting & Common Faults La E801p | PDF - Scribd [19V DC-In Adapter] ──> [+19V_VIN] ──> [+3VALW /
2.0 (Commonly documented as Rev 1.0, but Rev 2.0 shares significant architecture) Application: HP 15-BS Notebook series Power Architecture & Components
, frequently labeled as CSL50/CSL52, is a Compal-designed motherboard. Revision 2.0 corrected several early power management issues found in initial, earlier revisions. It is primarily used in: (e.g., 15-bs588tu, 15-bs010dx) HP 15-bw000 Series: (Similar architecture, often AMD)
The PQA1 component is often identified via thermal cameras as a point of failure in "no power" scenarios.
Understanding the power distribution network, signal flow, and circuit architecture of this board is essential for micro-soldering technicians and hardware engineers diagnosing common laptop faults like no-power conditions, failure to charge, or intermittent display drops. Board Specifications and Architecture Overview