The is the primary blueprint used by repair technicians to diagnose, troubleshoot, and fix logic board failures on the Lenovo IdeaPad S340-15IIL and S340-14IIL laptops. Manufactured by Compal, this specific motherboard platform powers devices with 10th-generation Intel Core "Ice Lake" processors (ranging from Core i3-1005G1 to Core i7-1065G7) paired with integrated Intel Iris Plus or UHD Graphics.
Understanding the LA-H103P Schematic: A Comprehensive Guide for Laptop Repair
The main DC input from the charger barrel jack. It passes through the reverse-polarity protection MOSFETs (first and second DC-in FETs) controlled by the charging IC.
The Compal LA-H103P (G34A) is a highly common motherboard used in the Dell Inspiron 15 3593 and 3501 laptop series. Powered by Intel 10th Generation Ice Lake processors, this platform frequently hits repair desks with power-on failures, short circuits, and charging anomalies.
Once the power button is pressed, the EC outputs a wake signal, closing various MOSFET switches to generate secondary rails: Power for the DDR4 RAM modules. la-h103p schematic
Look for the PWM IC responsible for generating +3VALW and +5VALW . If these are missing, the laptop will not turn on. Check KBC VCC : Ensure the EC/KBC chip is receiving 3.3V3.3 cap V Case 2: Laptop Turns On but No Display Check RAM Power: Verify +1.2V (DDR4) is present.
Working with the LA-H103P schematic can be challenging due to:
Verifying the DC-in jack and the charging IC if the laptop fails to charge. Bios/ME Cleaning:
As mentioned in a Badcaps post, repairing a screen while the battery is connected can burn out the connector. The is the primary blueprint used by repair
Inject 1V to 2V (maximum) with a high-current threshold into the +PWR_SRC rail. Use a thermal camera or isopropyl alcohol to check for a boiling ceramic capacitor. Common culprits are the filtering caps near the CPU VCore high-side MOSFETs. No 3.3V / 5V Standby Rails
supplies secondary sub-regulators and USB sub-circuits.
Unveiling the LA-H103P Schematic: A Comprehensive Guide
Find the main current-sensing resistor (often designated as PR301 or similar depending on the exact revision) to ensure 20V distribution across the system. Once the power button is pressed, the EC
I can provide the exact pin numbers, resistor values, or voltage specifications to help you . Share public link
Typical issues for this board involve frozen EC (Embedded Controller) chips or corrupted BIOS, which may cause the laptop to charge but fail to turn on.
This article provides a comprehensive analysis of the LA-H103P board, where to find its schematic, how to read it for common faults, and the specific power rails and signals you need to understand.