Check point: Even when the laptop is turned off, you must find 3.3V and 5V on the coils surrounding the standby IC. 3. Memory and Run Rails ( +1.2V_PWR , +1.0V_Run )
The is a vital technical document for engineers and technicians tasked with repairing the Acer Nitro 5 (AN515-52) and Acer Aspire 7 (A715-71) series laptops. This motherboard, often referred to by its internal Compal model name DH5VF , is a complex multi-layer PCB designed to support high-performance gaming hardware. Core Technical Specifications
A high-side MOSFET in the +VCC_CORE or +VGA_VCORE phases breaches, allowing the unrestricted 19V input rail to bridge directly into the low-voltage processor core line.
Ensure the RAM slots are receiving their required voltage. la-f952p schematic
The charger injects 19.5V into the board. This voltage passes through the input protection MOSFETs (managed by the charging IC) to become the primary system rail, usually labeled as or +19V_A .
The LA-F952P is an all-in-one System-on-Chip (SoC) architecture. The CPU and Platform Controller Hub (PCH) are integrated into a single BGA package. This design choice significantly reduces manufacturing costs and space but raises the stakes for diagnostics; a shorted primary data line or a catastrophic high-side MOSFET failure can instantly destroy the expensive SoC. Key Architectural Features:
Once B+ is stable, the standby PWM controller activates to generate (Always-On) and +5V_ALW . These rails power the basic circuitry needed for the laptop to look for a power button press. Check point: Even when the laptop is turned
The LA-F952P is engineered for the 8th Generation Intel Coffee Lake-H platform. Understanding its schematic requires familiarity with its primary components:
The LA-F952P communicates with the main laptop’s EC via signals like AC_IN , AC_OK , and SMBUS_CLK/DATA . Without the schematic, you cannot confirm why the mainboard is ignoring the power board.
where (gain‑bandwidth) ≈ 1 MHz for this device. For I_OUT(max)=200 mA and V_OUT=3.3 V , the minimum C_OUT ≈ 10 µF, matching the recommended value. This motherboard, often referred to by its internal
This symptom indicates that one of the late-stage power rails is drawing excessive current, forcing the power management IC to trigger over-current protection (OCP).
Here is the general power rail progression found in the LA-F952P schematic: 1. The Primary DC-In Rail ( DC_IN / B+ )
The board typically features a buck converter topology. The schematic tells you which MOSFET (high-side vs. low-side) is connected to which driver pin. If you find a short between VBUS and GND, the schematic helps you isolate the faulty component without blind desoldering.