Lae791p Rev 20 Schematic Diagram Verified Repack Jun 2026

For professional-grade boardview files and schematics, Laptop-Schematics.com maintains a database entry for the Acer Aspire A315-21 using this board. Repair Context

[19.5V DC-In] ──> Check +PWR_SRC ──> Check +3VALW/+5VALW ──> Check EC (KB9022) ──> Check CPU VCC_CORE

The LA-E791P is a high-density motherboard typically featuring: Integrated Intel Core i3/i5/i7 (6th or 7th Gen). Memory: DDR4 RAM slots. lae791p rev 20 schematic diagram verified

A quick can highlight out‑of‑spec items.

: Main system power rail (approx. 19.5V from DC-In or 11.4V–15.2V from Battery). A quick can highlight out‑of‑spec items

These are the "standby" voltages. Without these, the Power Button will never trigger the startup sequence. The schematic identifies the specific PWM controller responsible for these voltages. 3. The Power Sequence Block Diagram

The sleep signals enable secondary voltage regulators ( +3V_RUN , +5V_RUN , +1.2V , and finally +VCC_CORE ). These are the "standby" voltages

Commonly controlled by a "Step-Down" IC (like the TPS series), these voltages must be present before the laptop can even respond to the power button. Powers the KBC/Super IO chip.

Confirm 19V is crossing the entry MOSFETs. If stuck at the first MOSFET, check the gate voltage driven by the charging IC.