The 10203-1 LA56 MB 48.4JW06.011 is a motherboard primarily used in Lenovo B560 and Lenovo V560 laptop models. The most useful feature of its schematic is the detailed Power Sequencing and Management section, which is critical for diagnosing "No Power" or "No Display" issues common in these older models. Key Technical Specifications

A. Power Delivery (The "Power Tree")

  • Main DC-In (PQ307/PQ308): The board uses a 3-MOSFET switching architecture for input isolation. The schematic shows a BQ24780S (or similar) charging IC. This IC handles battery charging and system power distribution via ACDRV signals.
  • Always-On Rails: +3VALW (3.3V Always) and +5VALW (5V Always) generated by a TPS51285 or RT6585B dual-channel buck converter.
  • Core VR (VCCCore): The CPU voltage regulator module is controlled by an ISL95857 or NCP81206. The schematic indicates a 1+2 phase design for the IA core and GT (graphics) core.
  • Graphics Rail (NVVDDS): For the discrete NVIDIA GPU, a separate regulator (often an NCP81174) provides 0.8V to 1.1V depending on load.
  • DDR Memory Rail: 1.2V (DDR4) or 1.35V (DDR3L) generated by a linear regulator or small PWM controller.

4.3 Reliability

  • Component Derating: All passive parts are specified at 125 % of the maximum expected voltage or current, ensuring operation under temperature extremes (+85 °C / –40 °C).
  • Redundancy: Dual‑path communication (RS‑485 + CAN) guarantees that a single‑line fault does not cripple the device.

VLab.su: A primary resource for this specific board's repair discussions and BIOS/Schematic files.