To help pinpoint the exact failure point on your board, please share a few additional details:
The Charging IC (often an Intersil/Renesas ISL series or Texas Instruments BQ series) must sense the correct adapter voltage on its ACIN / ACDET pin to turn on the gates of these isolation MOSFETs.
However, if you are repairing a device containing this board, I help you:
The ASL50 LAC921P Rev 10 is a complex, multi-layered PCB designed to support modern Intel processors. Because this revision includes updated power management integrated circuits (PMICs) and refined signal paths compared to earlier iterations, using an older schematic can lead to incorrect voltage readings or misidentified components. An exclusive look at this Rev 10 document reveals the intricate layout of the 3V/5V "always-on" rails, the CPU core voltage (VCC_CORE) phases, and the delicate communication lines between the BIOS chip and the Super I/O controller. asl50 lac921p rev 10 schematic exclusive
Technicians tracking issues on the ASL50 LAC921P often encounter a few recurring symptoms. No Power / Dead Motherboard Check the main current sensing resistor for 19V.
Typical sections found in the include:
: Firmware dumps for this specific revision are often needed for "bricked" boards that fail to post. Where to Find Schematics To help pinpoint the exact failure point on
Integrated Intel Core processors (typically 5th or 6th Generation Broadwell/Skylake U-processors)
Must be high. If 0V, the board thinks the lid is closed and won't turn on. PLTRST# Near PCH or Wi-Fi slot
motherboard is the heart of numerous series laptops, known for their budget-friendly performance. However, due to its age, this platform is prone to power rail failures, BIOS corruption, and charger detection issues. An exclusive look at this Rev 10 document
The circuit that powers the CPU. Modern laptops use multi-phase buck converters. The schematic will show the PWM controller chips (often identified by codes like "95836" or "NCP81215") and the associated High-Side/Low-Side MOSFETs. A short on Vcore usually indicates a dead CPU.
Intel Core i3/i5/i7 (Broadwell/Skylake) or AMD variants.