You can preview the LA-C921P Schematic Overview to see block diagrams and component lists . Common Repair Scenarios Technicians often reference this schematic for:
If a short exists, use a DC bench power supply to perform a voltage injection test at low voltage (e.g., 1V) to see which component gets hot. Step 3: Verify the Standby Voltages
Before you press the power button, the motherboard must generate low-voltage power to keep the Super I/O (Embedded Controller) and the BIOS chip alive. The standby IC steps down the 19V rail into steady +3.3V and +5V lines. 3. System and Memory Rails (+1.35V / +1.05V)
Intel Broadwell or Skylake Core i3/i5/i7 U-Processor series (integrated BGA SoC).
Check the clock crystal oscillator signals next to the SIO/PCH to ensure the motherboard timing circuits are oscillating correctly.
Measure the voltage on the DC power jack's pins. You should read approximately 19V when the laptop is plugged in.
The is a Compal-manufactured motherboard designed for the Intel Skylake (SKL) platform, often paired with Nvidia N16E discrete graphics . Platform: SKL-H + NV (Nvidia N16E-GS/GT/GX) .
