: On-board LPDDR3-1866 dual-channel RAM, not customer upgradeable , with a maximum capacity of 8GB.
Based on typical configurations for these models, the schematic covers the following architecture:
: Often related to the USB-C charging controller or blown MOSFETs on the 19V rail. BIOS Issues la-d401p schematic
The PFC circuit boosts the rectified voltage (approx 320V DC) up to a higher DC voltage (typically around 380V–400V). This ensures the power supply runs efficiently.
| Parameter | Typical Value | Remarks | |-----------|----------------|---------| | | 12 V – 24 V | Wider range improves flexibility | | Output Voltage (Diode Forward) | 2.5 V – 4.5 V (adjustable via R5‑R6) | Set according to diode datasheet | | Maximum Diode Current | 3 A – 5 A (depends on R4) | Keep within diode’s rated current | | Efficiency | 70 % – 85 % (boost + regulation) | Measured at 24 V input, 4 A output | | Thermal Shutdown Threshold | ~150 °C | Configurable by TMP1 position | | Stand‑by Power Consumption | < 100 mW | With driver disabled | This ensures the power supply runs efficiently
The LA-D401P is a reference code assigned by Compal Electronics (one of the largest ODM manufacturers for Lenovo, Dell, and HP). This specific board is predominantly found inside the and Y720-15IKB gaming laptops.
In this comprehensive guide, we will dissect everything you need to know about the LA-D401P schematic: what it contains, where to find it, common faults it helps solve, and how to read it like a pro. In this comprehensive guide, we will dissect everything
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