Measure the voltage on the DC power jack's pins. You should read approximately 19V when the laptop is plugged in.

The laptop consumes 0.00A on a DC bench power supply.

If you purchased this board from a supplier (e.g., on eBay, AliExpress, or a display parts distributor), ask the seller directly for the "Pin Definition" or "Drawing." They often won't give the full schematic, but they will provide the pinout for the voltage input and LVDS/video cable, which is usually what repair technicians need.

The "Rev 10" in the search query refers to the board's revision number. Revisions are engineering changes made over time. Using the correct schematic for your specific board revision is critical, as component placements or circuit designs can vary from one revision to the next.

The Badcaps forum has a massive repository of power supply schematics.

This technical guide provides a comprehensive overview of the LA-C921P motherboard architecture, its primary power rails, common failure points, and a structural breakdown of what you will find inside the free schematic diagram. 1. Motherboard Specifications and Architecture

Typically designed for Intel Core i3/i5/i7 System-on-Chip (SoC) platforms (such as Broadwell or Skylake architectures, depending on the generation match). Memory Architecture: DDR3L or DDR4 SO-DIMM slots.

Integrated Intel HD Graphics, with some premium variants featuring an optional discrete AMD or NVIDIA GPU layout (marked as "DIS" or "UMA" in the schematic).

Once you have the schematic and boardview, here is a logical workflow to diagnose your board:

I can then explain the circuit operation, suggest test points, and identify likely failed components – .

When executing deep component-level repairs, relying purely on manual probing can be incredibly time-consuming.