La-e791p Rev 2.0 Schematic Diagram [repack]

LA-E791P Rev 2.0

The (also known as the Compal CSL50) is a motherboard commonly found in HP 15-BS series and HP 250 G6 laptops. This schematic is essential for diagnosing power-related issues, "no display" scenarios, and charging faults. Schematic Overview & Components

| Rail | Name | Source | Enables Next | |------|------|--------|----------------| | +3VLP | Always-on RTC | Battery/DC | SIO_RTC | | +3V_L | Deep Sleep | Linear Reg (PU201) | +3V_L -> EC_VCC | | +5V_ALW | Always on 5V | PU401 (TPS51285) | +5V_ALW -> +3V_ALW | | +3V_ALW | Always on 3V | PU402 (RT8239A) | EC_PWRBTN# | | +VDD_CORE | Vcore CPU | PU501 (RT8239B) | VR_READY | | +VDD_SOC | SoC/GPU | PU601 (SY8288) | ALL_SYS_PWRGD | La-e791p Rev 2.0 Schematic Diagram

Almost every schematic starts with a Block Diagram. LA-E791P Rev 2

What is the LA-E791P Rev 2.0?

: Missing CPU core voltage is a frequent diagnostic challenge. Repair guides suggest checking the PWM controller and power FETs associated with the +VCC_CORE line. Resources & Downloads KiCad Design Tips ARM Cortex-M4 Development

  1. Visual Inspection: Open the schematic to Page 2. Check all public points (PJP400 - DC Jack). Look for burnt MOSFETs PQ5001/PQ5002.
  2. Measure DC-in: Use the schematic to find the main fuse (PF5001). Is 19V passing? If not, short.
  3. Check REGN: Look at U5000 (BQ24780S). The schematic says Pin 24 (REGN) should output 6.0V. If 0V, IC is dead.
  4. Check ACOK: Trace the ACOK line. It should go high (3.3V). If low, the schematic leads you to the pull-up resistor (RP5003).
  5. Finally, LDO: Check +3.3V_ALW and +5V_ALW. If absent, the schematic directs you to check the enable signal from the SIO (IT8987E).

Intel Skylake-U

The schematic covers a system architecture typically built around the (6th Gen) or Kaby Lake-U (7th/8th Gen) processors.

This is proprietary technical data owned by Lenovo/Compal (the ODM). It is not officially available to the public. Technicians usually acquire these through the following methods: