If you are currently troubleshooting this specific motherboard, let me know (e.g., completely dead, spinning fan but no display, loop restarting) or which voltage rails you've already measured , and I can guide you through the next exact pins and components to check on the schematic.
Always-on power rails (S5 state) generated by the primary PWM controller (often a TPS51125 or equivalent). Memory power rail (DDR3 VCC) active in S3 and S0 states. 1.05V_PCH Power supply for the Intel HM65 Platform Controller Hub. VCC_CORE Variable (~0.8V - 1.2V)
A dedicated VRM section manages the processor's power needs. 10203-1 la56 mb 48.4jw06.011 schematic
| Component | Specification Details | | :--- | :--- | | | Supports Intel 1st generation Core processors (Arrandale), such as the Core i3-370M. The CPU is installed in an rPGA-989 socket. | | Chipset | Intel HM55 (Mobile Intel 5 Series Chipset). | | Graphics | Available in two main variants: • Integrated Graphics with an Intel GPU within the CPU. • Discrete Graphics with an NVIDIA GeForce 310M (N11M-GE2-S-B1) chip. | | Memory | Two SO-DIMM slots supporting DDR3 (1.5V) memory modules. | | BIOS/KBC | The system typically uses an MX25L3206E (4MB) chip for the main BIOS and a PM25LV010 chip for the Embedded Controller (KBC). | | Display Output | The motherboard uses an LVDS connector to send power and data to the built-in laptop screen, which is critical for troubleshooting display issues. |
: You can often find the full PDF on technician forums like VLab.su or Notebook1 . The CPU is installed in an rPGA-989 socket
While the exact visual of the schematic is not reproduced here, typical designs with a similar naming convention consist of the following core sections:
10203-1 LA56 MB 48.4JW06.011 refers to the motherboard schematic and BoardView for the Lenovo B560, V560, and Z580 series laptops , manufactured by Wistron. and Z580 series laptops
This section diagnoses and repairs the most common issues with the 10203-1 LA56 MB.
Locate the step-down regulator IC responsible for generating +3.3V_ALW and +5V_ALW (typically a TPS51123 or similar chip).