To help you source the correct documentation for your specific repair, what (e.g., Rev 1.0, Rev 2.0) is printed on your PCB? Share public link
The laboratory power supply immediately hits its current limit when injecting voltage, or the adapter light blinks/turns off when plugged in.
Look for the power-on sequence chart (usually found in the first few pages of the Compal PDF).
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: Most versions come with 8GB of built-in RAM ; there are no traditional memory slots for upgrades. Graphics : Uses integrated Intel HD Graphics . la-d401p schematic
The LA-D401P is a laptop motherboard, and schematics for specific motherboards can be challenging to find publicly due to their proprietary nature. However, I can guide you on where to look and what to expect.
No charging or dead board usually points to a malfunctioning Charging IC or its supporting components. 3. 3.3V and 5V Always-On Rails (Page 40+)
Once the power button is pressed, the EC sends out enable signals ( EC_ON , P_ON ) to wake up the remaining voltage rails in a strict sequential order: Memory power rail for DDR4 RAM. +1.0V_PCH: Power supply for the integrated PCH.
To assist you further with your specific repair or research project, let me know if you need help looking up , interpreting a particular error state/voltage reading , or finding the pinout details for a specific controller chip on this board. Share public link To help you source the correct documentation for
Due to the high voltage required to power the LED backlight, the backlight fuse or the backlight driver IC is highly susceptible to shorting out if the display cable is unplugged while the battery is still connected. On the LA-D401P, tracing the display connector pins via the schematic will point you directly to the protective (often labeled with an F designation like F1 or F2 ). USB-C Charging and Power Delivery Issues
Locate the PWM controller responsible for generating these voltages. 2. No Display / Black Screen If the laptop spins fans but has no picture:
Typically supports DDR4 SDRAM or DDR3L depending on the specific revision, often using a dual-channel configuration. Graphics: Integrated Intel HD Graphics.
Schematics and "Boardview" files (typically in .brd or .pdf format) for the This public link is valid for 7 days
If you are a laptop motherboard repair technician, a hobbyist in electronics, or someone trying to resurrect a dead or Y720 , you have likely stumbled upon the cryptic string of characters: LA-D401P .
Typically features an integrated Intel Core i5-6200U or i7-6500U (6th Gen "Skylake-U" series).
Modern motherboards use logic gates and communication protocols (like I2C, SMBus, and SPI) between the Super I/O (EC) chip and the CPU. The schematic shows you which pins should host specific voltage signals (like S5_ENABLE or RSMRST# ) to authorize the laptop to boot. 3. Common Failure Points on the LA-D401P