La-e791p Rev 2.0 Schematic Diagram ((link)) Instant

Component labels marked with an @ or VREG@ symbol mean they are optional or "No-Pop" components. Depending on the exact sub-version of the Acer laptop (e.g., whether it has an optional dedicated GPU or an alternate storage configuration), those parts may not be physically soldered onto your board.

Intel Kaby Lake-U or Skylake-U Processor (Soldered BGA).

This rail is only generated after the CPU signals its voltage requirements via SVID (Serial Voltage Identification) lines to the PWM controller. Common Faults and Troubleshooting on the LA-E791P

HP 15-bs526ur LA-E791P Rev:2.0 BID 08328 Bios + EC Free Download-,File format (*.rar), File size:5.36MB.

: A 5.0V always-on rail that supplies the secondary regulators, USB power logic, and system standby lines. 3. RAM and Core Memory Power La-e791p Rev 2.0 Schematic Diagram

Includes SATA for storage, PCIe slots, HDMI connectivity, and a keyboard interface.

: A common failure point where the board powers on but fails to initialize video, often requiring specialized SOC-level diagnostics. Power Rail Issues

If +3VALW is present but the motherboard does not respond to the power button, the firmware inside the SPI Flash ROM may be corrupted.

: The board utilizes several critical voltage rails. In repair scenarios, 1.8V and 1V are typically "always on," while the 5V rail converts to "run power" at specific pins (e.g., pins 8 and 9) during the power-on sequence. BIOS & EC Corruption Component labels marked with an @ or VREG@

Does the laptop pull any on a bench power supply?

[Visual Inspection] ➔ [Check Resistance on Main Rails] ➔ [Measure DC-In Voltage] ➔ [Verify 3V/5V Always-On] ➔ [Check EC Signals]

: Technicians use the diagram to trace power distribution, such as identifying faults in the +VCC_CORE or battery charging circuitry.

: Available in both UMA (Unified Memory Architecture/Intel Integrated Graphics) and DIS (Discrete AMD/NVIDIA GPU) configurations. This rail is only generated after the CPU

The schematic outlines the intricate hardware mapping and power sequencing required for these devices. Processor & Core Logic

Using the La-e791p Rev 2.0 schematic diagram requires a basic understanding of electronics and circuit analysis. Here are some steps to follow:

The EC’s +3.3V_RTC backup circuit now includes a larger supercapacitor (0.22F vs 0.1F in Rev 1.0), allowing RTC retention for up to 72 hours instead of 24.

If you are currently troubleshooting this specific motherboard, let me know: