Lac781p Schematic Top !!hot!! -

A: The DC Power Path. Check the BQ24725A pins (ACDET, ACDRV). Check the main MOSFETs for shorts to ground (continuity test). Check the always-on 3.3V and 5V rails. If these are present, check the EC's crystal oscillator for activity.

+3V_LDO / +5V_LDO (Linear regulator outputs for powering the EC directly) 3. Memory & Core Rails (S3 to S0 States)

If you need help resolving a specific issue on this board, please share the following details: lac781p schematic top

Before diving into schematic tracing, verify the fundamental board infrastructure: Specification Details Compal LA-C781P (ABL51) Supported Devices HP Notebook 15-AF series (e.g., 15-af119ur, 15-af011ur) Processor Platform AMD Beema / Mullins SoC (e.g., AMD A6-6310, AMD A8-7410) System Memory DDR3L SO-DIMM (Low Voltage 1.35V) Charging IC Intersil ISL88731C or TI BQ24725A (labeled as BQ25A) Embedded Controller (EC) ENE KB9022Q Main SPI BIOS 8MB (64Mbit) Flash, e.g., Winbond W25Q64FVSIG Core Power Delivery Rails

Typically supports DDR3L (Low Voltage) RAM across two slots. A: The DC Power Path

: Manages the conversion to 3.3V and 5V rails, which are necessary for the standby power state.

The keyword encompasses more than just a diagram—it represents the complete understanding of a reliable, classic linear regulator from its high-level circuit connections down to the physical placement on a PCB’s top layer. Check the always-on 3

: A common "dead" board symptom where the 19V main power rail enters the board but fails to distribute due to faulty MOSFETs or current sense resistors near the power jack. Missing Always-On Rails : Technicians often check for the