: Identified as a PE642DT dual transistor. Faults in this chip often cause a "no lights" or "no power" symptom even if 19V is present at the input.
The "Rev 2.0" designation is critical. Dell and Compal (the OEM manufacturer) released multiple revisions of this board. A schematic for Rev 1.0 may have different resistor values, missing test points, or altered power rails compared to Rev 2.0. Always ensure your schematic matches the revision printed directly on the PCB.
Provides an interactive 3D virtual layout of physical traces and pin pads.
The LA-E801P Rev 2.0 Go to product viewer dialog for this item. la-e801p rev 2.0 schematic
Because Compal motherboards do not always print extensive silkscreen component identifiers (such as "R102" or "C55") directly on the fiberglass PCB, .
Intersil/Renesas ISL88739B managing the DC-in switching and battery charging cycle.
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: Confirm the processor releases the DRAM Reset signal ( DRAMRST# ). Lack of a reset flag usually indicates a corruption in the firmware or a microscopic fracture under the BGA processor assembly.
Keywords used: la-e801p rev 2.0 schematic, Dell Vostro 14-3458 motherboard, boardview file, laptop power sequence, IT8528 EC, RT8248 power IC
Do not only get the schematic. You also need the for LA-E801P Rev 2.0. This file (opened with OpenBoardView or LinkCAD) shows the physical location of every component (R for resistor, C for capacitor, Q for MOSFET). Pairing the schematic (logical connections) with the boardview (physical location) cuts troubleshooting time by 90%. Dell and Compal (the OEM manufacturer) released multiple
A common mistake I see junior technicians make
The schematic will show the inductor (PL..., e.g., PL401) for these rails. A common diagnostic trick is to desolder or measure the resistance to ground at these inductors. If the resistance is very close to Ω (e.g., 0.2 Ω), a capacitor further down the line is shorted. 3. Power Good (PWR_GD) and the SIO Chip
Manages power switching, keyboard matrix signals, and system fan feedback loops. Primary Power Rails and Voltage Delivery