la-9413p rev 1.0 schematic la-9413p rev 1.0 schematic la-9413p rev 1.0 schematic la-9413p rev 1.0 schematic

La-9413p Rev 1.0 — Schematic

| Rail | Voltage | Typical Use | |-------------|---------|----------------------------------| | +VIN | 19V | DC input (after isolation) | | +3VALW | 3.3V | Always-on (PCH, EC, BIOS) | | +5VALW | 5V | Always-on (USB, audio codec) | | +1.05VALW | 1.05V | PCH VCCASW | | +VCC_CORE | 0.6–1.3V| CPU core (S0 state) | | +VDDQ | 1.35V | DDR3L memory | | +1.5V | 1.5V | PLL / other | | +BAT_VOLT | ~7.6V | Battery pack voltage |

Revisions are critical. A Rev 1.0 board may have different resistor values, missing components, or routing compared to Rev 2.0 or 3.0. Using a schematic for Rev 2.0 on a Rev 1.0 board could lead to misdiagnosis. Always verify the exact revision number printed on the board before downloading any schematic. la-9413p rev 1.0 schematic

When a capacitor (e.g., PC401) is shorted, the schematic shows you exactly which power rail it belongs to, allowing you to isolate the short using an injection method. | Rail | Voltage | Typical Use |

The intelligence of the LA-9413P Rev 1.0 lies in its Microcontroller Unit (MCU). This component manages the user interface (switch pressing) and battery protection. Revisions are critical

  • Battery Protection: The MCU monitors the battery voltage via a voltage divider circuit. If the voltage drops below a set threshold (e.g., 2.8V - 3.0V for Li-ion), the MCU cuts the PWM signal to turn off the light, preventing deep discharge damage to the battery.

    • Laptop motherboards have 5–10 distinct power stages. Without the schematic, you cannot find the test points for: