Depending on the specific sub-model, it may use Integrated Intel HD Graphics or a dedicated NVIDIA N12P-GV-B-A1 GPU. Critical Power Rails and Voltage Steps
: Repair "stories" frequently involve re-flashing the BIOS and EC (Embedded Controller) firmware, which can be found on specialist platforms like ChinaFix when a device becomes "bricked".
The board features several crucial PWM controllers responsible for stepping down the 19V DC input to stable voltages (+3.3V, +5V, +1.5V, +1.05V).
Based on technical listings and repair forum data, this motherboard typically features: Compatibility: Lenovo B560, V560 series laptops. P/N & Model: 48.4JW06.011 / 10203-1 LA56 MB. 10203-1 la56 mb 48.4jw06.011 schematic
What you have measured so far on the main 3.3V and 5V coils?
Measure the inductors (coils) for +3.3V_ALW and +5V_ALW . If these are absent, verify if the PWM controller chip is receiving its main enablement signal ( EN or SHDN ). Troubleshooting a "No Display" or "No POST" Condition
The is the motherboard part number for the Lenovo B560 and V560 laptop series . This board is a Wistron-manufactured "LA56" platform. 🛠️ Schematic Details Platform Name: Wistron LA56 Common Laptop Models: Lenovo IdeaPad B560, V560 CPU Support: Intel Arrandale (Core i3/i5/i7 1st Gen) Chipset: Intel HM55 Project Code: 10203-1 📥 Accessing the Schematic Depending on the specific sub-model, it may use
Always-On voltage rails. Generated by a dual-channel synchronous step-down PWM controller (often an TPS51125 or RT8205 variant). These must be present as soon as the charger is connected.
The twin charging circuit entry MOSFETs often fail short-circuit or open-circuit due to external line surges from generic power adapters. When they fail open, the system remains completely dead with 0V present on the internal rail. 2. Corrupted BIOS / EC Firmware
A full schematic PDF would contain:
The schematic for the (Part Number: 10203-1 / 48.4JW06.011 ) is primarily associated with Lenovo B560 and V560 laptop models. Motherboard Specifications Manufacturer: Wistron Platform Name: LA56 MB Project Code: 48.4JW06.011 / 10203-1 Compatible Models: Lenovo IdeaPad V560, Lenovo B560 Schematic Download Resources
Locate the input MOSFETs (usually labeled PQ or Q tags close to the DC jack input on the schematic). Check ceramic bypass filtering capacitors connected directly between VIN and Ground. A cracked ceramic capacitor is the number one cause of standard 19V shorts on this platform. Issue B: Missing Standby Voltages (+3VALW / +5VALW)
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