La-e801p Rev 2.0 Schematic [new]

If the board turns on, check if DRAMRST (DRAM Reset) is high. Lack of DRAMRST often points to a failure in the power-good signal sequence from the RAM IC (G5616B).

8MB (64Mb) or 16MB (128Mb) SOIC-8 chip housing the UEFI firmware and Intel ME (Management Engine) region. 2. Power Rails and Voltage Distribution

Before connecting any power, configure your digital multimeter to (or Continuity Mode). Measure the resistance relative to the system ground at the large physical inductors (coils) across the board: la-e801p rev 2.0 schematic

Technicians frequently encounter specific component failures on this particular board revision:

When injecting voltage to locate a short on a main rail like +PWR_SRC , limit your supply to 1V and 1A to prevent burning the internal copper layers of the PCB. If the board turns on, check if DRAMRST (DRAM Reset) is high

This is a manufactured board (LA = Quanta design). Key sections:

If the schematic shows a short to ground on a main rail like +1.0V_MCP , use the schematic to find a safe injection point to identify the heating component. Safety Warning This is a manufactured board (LA = Quanta design)

It typically supports DDR4 memory and utilizes a soldered Intel SoC (System on Chip), meaning the processor and chipset are unified. Key Components in the Schematic

The laptop turns on (blue power LED lights up), the fan spins up to maximum speed, but there is no display (Black Screen / No POST).

Once the B+ rail is stable across the board, it feeds the primary step-down controller (often an RT8243 or similar dual PWM regulator). This integrated circuit generates two permanent reference lines:

Locate the "Power Block Diagram" page (usually page 2 or 3 of the Compal schematic). Follow the arrows to trace which voltage rail enables the next. For instance, if +3VALW is missing, check the inputs and enable pins of the 3V PWM regulator chip using the schematic pinout map.