Intel Core i3 / i5 / i7 (6th Generation Skylake mobile processors)
Thank you for your assistance.
If the motherboard displays a solid power LED but yields no display or fan spin, the BIOS firmware may be corrupted. The LA-C921P features a SPI Flash memory chip (usually an 8MB or 16MB Winbond chip). Flashing a clean dump with a verified ME region often resolves "no post" anomalies. Shorted Ceramic Capacitors on +VCC_CORE or +19V
: Locate the primary power line entry points. Technicians use the schematic to isolate components like ceramic decoupling capacitors ( PCxx ) or high-side MOSFETs connected to ground. Desoldering isolation jumpers (labeled as PJP on the motherboard) allows the technician to divide the 19V rail into sections to pinpoint the exact location of the short circuit. 2. Corrupted BIOS / EC Firmware asl50 lac921p rev 10 schematic free
: A specific download link for the Rev 1.0 version is often hosted on Google Drive Ahli Laptop YouTube Repair Communities : Sites like Badcaps.net VinaFix.com
The Compal (also known as the ASL50) is a widely used laptop motherboard found in several budget and mid-range Lenovo laptop models, most notably from the Lenovo Ideapad series. When these laptops fail to power on, suffer from liquid damage, or experience sudden component failure, having access to the official motherboard schematic diagram is the single most important asset for a component-level repair technician.
Dear [OEM Support Team],
: Legacy SATA interface for 2.5-inch hard drives/SSDs, an optical disc drive connector, real-time clock (RTC) circuitry, and basic I/O (USB 3.0, HDMI, RJ45 Ethernet, and a combined audio jack). Power Rail Architecture & Sequences
Verify the presence of the +3VALW rail at the power button pin and on pin 8 of the BIOS chip.
Repairing without a schematic is challenging but possible if you understand switch-mode power supply basics. Always discharge the large capacitor before touching the board – it can hold a lethal charge for hours. Intel Core i3 / i5 / i7 (6th
A preview and downloadable overview are available on Scribd .
: Technicians like Ahli Laptop provide video guides for this specific board and often include Google Drive links for the ASL50 LA-C921P Schematic in their descriptions.
: Typically supports Intel Broadwell or Braswell processors, depending on the specific sub-model. File Format Flashing a clean dump with a verified ME