Memory power rails activated upon transitioning out of standby.
Based on the 48.4JW06.011 design, technicians frequently encounter the following issues:
Every motherboard layout has known weaknesses due to thermal stress, component aging, or physical design constraints. On the 48.4JW06.011 board, technicians frequently encounter the following issues: 1. Shorted Ceramic Capacitors (MLCCs)
Locate the charging IC (often an ISL or BQ series chip) on the schematic. Check the ACIN and ACOK pins. If the IC does not detect a valid adapter, it will not pull the gates of the entry MOSFETs low/high to let power through. Short Circuits on the B+ Rail 10203-1 la56 mb 48.4jw06.011 schematic
The primary DC voltage enters through the jack, passes through the reverse-polarity protection MOSFETs, and populates the primary high-voltage rail ( System_BIAS ).
Models equipped with the dedicated AMD Radeon graphics chip suffer from thermal degradation. Constant thermal expansion and contraction can cause solder balls beneath the BGA chip to crack, resulting in artifacts on the screen, blue screens (BSOD) during graphics driver installation, or a complete failure to display. 5. Technical Specifications Matrix Component/Feature Schematic Designation / Specification 4 to 6 Layers Main Power Controller Typically RT8205 / TPS51125 (3V/5V Always) Battery Charger IC Typically ISL6251 or OZ8618 System BIOS Chip SOP-8 package, 4MB or 8MB SPI Flash Clock Generator Integrated into PCH / External ICS clock chip 6. Repair Best Practices
This is a multi-page PDF showing the logical electrical connections of the motherboard: Memory power rails activated upon transitioning out of
Lenovo B560 and Lenovo V560.
The LA56 uses an 8MB (64Mbit) SPI Flash chip. Symptoms include a "Black Screen" with the fan spinning.
The LA56 motherboard is designed around Intel’s Sandy Bridge microarchitecture, pairing 2nd Generation Intel Core i3, i5, or Intel Pentium processors with mobile chipsets. 1. Intel HM65 Express Chipset (PCH) Shorted Ceramic Capacitors (MLCCs) Locate the charging IC
A shorted high-side MOSFET in the CPU core section or the 3V/5V secondary rails.
However, I can offer some general guidance on how to approach finding or understanding schematics like the one you mentioned:
This board is most commonly found inside the Acer Aspire E5-575G , E5-553G , or similar models utilizing the Intel Skylake-U (6th Gen) or Kaby Lake-U (7th Gen) processors paired with NVIDIA GeForce 940MX or GTX 950M dedicated graphics.