(also known as VALA1) is a motherboard schematic and PCB design manufactured by Compal Electronics Dell Latitude E6540
Possibly. The A515-51 uses the LA-B921P (similar but not identical). While some power rails may match, the pinouts for the EC and connectors differ. Do not assume compatibility.
Refer to the "Voltage Rails" table (usually on page 2 or 3 of the PDF) for expected values. If you(Blinking LEDs, totally dead, or fans spinning?) Have you measured the ? Is there any visible liquid damage or burnt components?
Use these pages to check for shorts on peripheral lines. For example, the LCD backlight enable signal (LCD_EN) can be traced back to the EC.
Using the schematic, locate the and LID_SW# signals. If the EC is not detecting a closed lid or a power button press, the system will never fully turn on.
The EC (IT8987E) is the first thing that wakes up after +3VALW. Pins to check:
