Unfortunately, there is no direct, official public download for the APW70 LA-C391P schematic distributed by HP. However, repair communities have identified a practical substitute. The standard advice from experts is that the schematic and boardview for the (board number APW50), used in the HP ZBook 15 G3 and 17 G3 models, is electrically similar and can be used for troubleshooting the LA-C391P. This is a widely accepted workaround in the repair community.
APW70 LAC391P is a motherboard model used in the Dell Latitude 3510
Must read a clean 3.3V and 5V respectively.
I will open the most promising results to gather information for the article. These include result 0 from the "APW70 LA-C391P schematic" search (remont-aud.net), result 2 from the same search (HP community thread), result 0 from the "HP ZBook 17 G3 schematic boardview" search (badcaps.net), result 1 from the same search (diy-laptoprepair.com), and result 2 (indiarefix.in). I will also explore the eBay listing (result 3) for product details. search results have provided a mix of relevant and less relevant information. The most important findings are: apw70 lac391p schematic portable
The Compal LA-C391P motherboard is a vital laptop component, commonly used in portable devices like the Dell Latitude 12 7000 (E7250) series. Troubleshooting power delivery or component failures on this board requires a deep understanding of its schematic diagram and the role of its primary power management controllers, such as the APW70.
If the board shows any signs of or physical burn marks
Many "no power" or "black screen" issues on the APW70 are resolved by reflashing the BIOS chip rather than hardware repair. Unfortunately, there is no direct, official public download
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Remember these three takeaways:
Technicians and DIY repair enthusiasts often discuss the difficulties of sourcing parts and documentation for this specific motherboard model. This is a widely accepted workaround in the repair community
Always-on power rails. These run the Super I/O chip (KB9022Q) and the power button circuitry. Without these, the laptop remains completely dead.
Use a multimeter in continuity mode on the large grey inductors (coils) to see if any main rail is shorted to ground. 📂 Finding the Schematic