This article explores why the Rev 2.0 schematic is vastly superior, untangles the crucial power rails, and breaks down exact step-by-step diagnostic workflows for common board failures. Why the LA-E801P Rev 2.0 Schematic is Better

The Rev 2.0 often requires a specific BIOS dump. For repair, verified BIOS files can be found on community platforms like IndiaFix .

provides a much better, highly accurate, and far more reliable blueprint for professional hardware repair.

Ask any PCB designer: grounding is where good schematics go to die. Rev 15 used a simple ground plane. Rev 18 added a split between power and signal ground but connected them at a single point—poorly. Rev 20 implements a (R47) that allows the user to physically separate noisy power ground from clean analog ground.

Repairing a Rev 2.0 board using a Rev 1.0 schematic can be misleading. Manufacturers often tweak the or swap out proprietary PWM controllers between revisions. The Rev 2.0 diagram ensures you are measuring the correct test points and referencing the exact part numbers for surface-mount components.

Often uses the ISL or BQ series chips. Check the ACIN and ACOK signals if the laptop won't charge or turn on.

Measure the voltage on the power button pin ( ON/OFF# ) at the EC—it should rest at 3.3V and drop to 0V when pressed.

This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. HP 15-BS LA-E801P I5-7200U UMA Laptop Motherboard

| Issue ID | Location | Problem Description | |----------|----------|----------------------| | F01 | Input filtering | Missing common-mode choke – high EMI | | F02 | MOSFET gate drive | 100Ω resistor too low; causes ringing | | F03 | Feedback loop | Insufficient phase margin (oscillates at 40kHz) | | F04 | Ground plane | Split ground with no stitching via | | F05 | Thermal pad | No thermal relief on regulator tab |

From analyzing three different physical Rev 20 boards and partial OEM schematics, the following critical issues were identified:

Options for UMA (Integrated) or discrete GPU (AMD R17M-M1/M2) with dedicated DDR3L VRAM.

Older designs used a simple RC ramp on the enable pin. Rev 20 adds a dedicated soft-start capacitor (Css) connected to an internal 5µA current source. The formula is now:

In Rev 1.0 schematics, factory modifications (known as engineering change orders or ECOs) are missing. Technicians frequently run into situations where a resistor or capacitor on the actual board does not match the value printed in the Rev 1.0 PDF. The Rev 2.0 schematic reflects the exact values found on production-line retail laptops, preventing calculation errors during component replacement. Updated Power Sequence Diagrams

A "better" schematic is not just about the correct connections; it's about creating a robust and readable design that facilitates troubleshooting and ensures long-term reliability. Here is a structured approach to developing a superior schematic for your LA-801FP display.

What the laptop is showing (e.g., completely dead, spinning fan but no display, blinking charging light).

Since the release of Rev 20, several open-source hardware projects have migrated. Verified layouts are available on GitHub (search “LAE801P Rev 20 PCB”). The manufacturer has also released an updated application note (AN-LAE801P-20) with recommended BOM and Gerber files.