The ASL50 LA-C921P Rev 1.0 is a Compal Electronics schematic for HP Notebook 15-ac series laptops, serving as an essential blueprint for board-level repairs, troubleshooting power rails, and identifying component failures. Supporting Intel Haswell/Broadwell/Skylake platforms with UMA or discrete graphics, it is crucial for analyzing signals like VR_ON and managing power sequences via the KB9012 EC. Detailed schematics can be found at Laptop-Schematics and other technical resources. ASL50 LA-C921P REV 1.0 SCHEMATIC HP Notebook 15-ac
Power Sequence0;adf;: Technicians follow a specific flowchart to verify input/output voltages on the SIO (Super I/O) chip. asl50 lac921p rev 10 schematic exclusive
The LAC921P is increasingly difficult to find. The exclusive Rev 10 schematic includes a compatibility note: You can substitute an NCP1219 controller with a daughterboard, but only if you disable the LAC921P’s internal HV startup and add an external startup circuit per Figure 3 in the schematic appendix. Do not attempt this without the full exclusive diagram. The ASL50 LA-C921P Rev 1
The ASL50 LA-C921P Rev 1.0 schematic is a critical technical blueprint for repairing HP Notebook 15-ac, 15-ay, and HP 250 G4 laptops. This specific board revision is built on the Intel Skylake-U platform and often features dedicated AMD Radeon R5 M330 graphics or integrated UMA configurations. Technical Deep Dive & Review ASL50 LA-C921P REV 1
Processor Support: Intel Core i3-6100U, i5-6200U, and i7-6500U (Skylake architecture). Memory Type0;494;: DDR3L (Low voltage).
Exclusive Insights
Technical Details The document excels in detailing the IC pinouts. The main controller IC (often a proprietary or OB-series controller on these boards) has clear voltage rail indicators. The safety interlock logic—often a point of failure on the ASL50—is drawn out clearly, making it easy to bypass for testing or identify a faulty sensor.