The Super I/O and BIOS chip need 3.3V to listen for the power button press.
Available in UMA (Integrated Intel HD Graphics via CPU) or DIS (Discrete NVIDIA GeForce GPU, such as the GT 520M or similar, depending on the exact board variant).
The is an invaluable map for component-level repairs. By systematically tracing the 19V input, checking the 3.3V/5V always-on generation, and monitoring the Super I/O power-up sequence, you can diagnose and repair over 90% of common motherboard failures. Always work with anti-static protection, use a high-quality multimeter, and cross-reference component labels on the board with the schematic tracking lines for the safest and most efficient repair outcome. 10203-1 la56 mb 48.4jw06.011 schematic
Before applying power, use a digital multimeter in resistance mode to measure the impedance on all major inductor coils (3V, 5V, DDR, PCH, CPU). A reading below 10 Ohms on the 3V or 5V rails indicates a severe catastrophic short circuit down the line.
The always-on controller IC runs continuously whenever the AC adapter is attached. If a USB port is physically broken and shorts out the +5V line, or if liquid enters the power button area, this chip can burn out, taking down the standby voltages. 4. Failed Discrete GPU (On Applicable Models) The Super I/O and BIOS chip need 3
These power the PCH, secondary ICs, and internal bus lines.
Before handling the motherboard, ensure you have an ESD-safe work surface, a digital multimeter, a soldering station, and a proper understanding of component-level safety. By systematically tracing the 19V input, checking the 3
A typical Wistron schematic is divided into a structured block diagram followed by detailed power and signal pages. When you open the 10203-1_LA56 schematic PDF, it generally adheres to a standardized page numbering blueprint: The Block Diagram (Page 1–3)
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If a power rail turns on but the next one fails to trigger, check the PGOOD output of the active chip. If a chip does not assert its PGOOD signal high, the Super I/O will abort the boot sequence.
The is a motherboard manufactured by Wistron for the Lenovo B560 and V560 laptop series . Technicians frequently seek its schematic and boardview files to address common power-related failures and display issues. Core Specifications Manufacturer: Wistron Model Number: 10203-1 LA56 MB Part Number: 48.4JW06.011 Compatible Laptops: Lenovo B560, Lenovo V560 Common Issues & Repair Insights According to community repair forums and technical logs: