Lae791p Rev 20 Schematic Better Info

: Because Rev 2.0 has specific firmware requirements (BID 08328 for certain models), the schematic helps identify the correct SPI Flash chips for re-programming the BIOS and EC. Where to Find It

Verify that the charging IC (often an Intersil or TI chip) is outputting the proper gate drive signal ( ACDRV ) to turn on these transistors.

Essential for diagnosing memory-related POST failures or blue screens.

To help locate specific components or trace paths on your board, what or voltage readings are you currently seeing on this motherboard? If you have noticed any burnt areas or components getting warm, sharing those details can help narrow down the cause. Go to product viewer dialog for this item. lae791p rev 20 schematic better

: While a schematic diagram explains how components connect logically , a corresponding CAD boardview file (.BRD or .BDV format) shows where components are physically located on the multi-layered fiberglass PCB.

Verify that the power pin (Pin 8) receives a steady +3V_SPI rail.

The DC-in jack delivers voltage to the main system rail, typically labeled as +19V or +19V_VBAT . This power goes directly through the dual input protection MOSFETs and the main current-sensing resistor. If a short circuit occurs here, the charging IC will immediately shut down power delivery to protect the board. 2. Standby / Always-On Stage ( +3VALW and +5VALW ) : Because Rev 2

. For many, having a high-quality, high-resolution copy of the LA-E791P is a small act of rebellion against "disposable" tech. It enables a $5 component fix to save a $1,000 laptop from a landfill. Conclusion

Rev 2.0 might introduce subtle changes to the , GPU rails , or the charging circuit . Using a Rev 1.0 schematic on a Rev 2.0 board can lead to incorrect voltage readings, resulting in faulty component replacements. A dedicated Rev 2.0 PDF provides the precise voltage expected at specific pins. 2. Improved Boardview Integration

The LA-E791P (often prefixed with Compal , the original design manufacturer) is the main logic board for a wide range of HP laptops, primarily from the and 15-bs series . Other common model numbers that use this board include the HP 15g and 15-bs5xx series. To help locate specific components or trace paths

: Leverages an on-board AMD R17M discrete GPU using DDR3L dedicated VRAM (configured alongside Intel HD Graphics via UMA/MUX switching).

: The motherboard comes in two main variants. The Unified Memory Architecture ( UMA ) uses integrated Intel HD Graphics. The Discrete (DIS) variant routes processing power through a dedicated mobile graphics chip, such as the AMD R17M GPU paired with discrete DDR3L VRAM.

: Features unified SATA channels, high-speed PCIe lanes, and modern high-definition video out configurations. Why the Rev 2.0 Schematic is Crucial

Essential for diagnosing faulty HDMI, USB, or Audio processing connections . Troubleshooting Common Issues

The is a specialized engineering drawing for HP laptop motherboards (typically HP 15-BS series). It provides critical details for chip-level repair, including power rail management and component-to-component signal flow. Key Features and Improvements