You can often find the full schematic and boardview files on technical forums like Indiafix or AliSaler , which are vital for tracing "dead" boards with no power.
(also known as LA-D711P or BDL51) is a common motherboard platform utilized in several HP laptops, particularly the HP 15-ba and 15-af series.
This is the brain of the LAD711P. The Rev 10 uses an or UC3844 (depending on date code). The schematic top shows:
laptops (e.g., HP 15-ba009dx, 15-ba055ur). While "Rev 1.0" is a standard early revision, many technical archives and repair resources commonly reference Key Content of the LA-D711P Schematic
The "top side" (or TOP) of the schematic and boardview, often viewed with the processor facing up, contains the primary power delivery components, processor, and critical connectors. 2.1. Processor and Graphics (APU) lad711p rev 10 schematic top
The following components are used in the LAD711P Rev 10 schematic top-level design:
1.0 (earlier versions may differ from Rev 3.0 commonly seen in later units) Processor Support: Designed for architectures, such as the AMD E1-7010 or A6-7310 Typically supports SODIMM modules Schematic & Troubleshooting Notes
When the power button is pressed, the Super I/O chip releases a series of enable signals that trigger secondary voltage regulators: Powers the DDR3 memory modules.
This article explores the top side component layout, key power rails, and typical diagnostic steps found on the LAD711P schematics. 1. Introduction to the LA-D711P Platform You can often find the full schematic and
The LAD711P Rev 10 finds applications in a diverse range of products:
The LAD711P Rev 10 schematic top-level design consists of [number] major components, including:
: This multi-phase DC-DC buck controller manages the high-current demands of the integrated AMD APU. Common issues include shorted high-side MOSFETs on the CPU rail, forcing the laptop into an immediate thermal shutdown loop. Step-by-Step Diagnostic Protocol for a Dead LA-D711P
If your power rails are correct but the machine refuses to cycle or post, the issue may lie with corrupted firmware rather than hardware component failure. The LA-D711P board holds two important firmware blocks: the main and the internal memory of the ENE KB9022 microcontroller . Technicians frequently resolve power-on anomalies by clear-flashing both chips with a verified, clean factory dump file. The Rev 10 uses an or UC3844 (depending on date code)
: Measure resistance to ground on the +B current sensing resistor. A low resistance (under 10 Ohms) indicates a shorted ceramic capacitor or high-side MOSFET further down the line. 2. The Embedded Controller (EC) Circuit
| Component / Area | Schematic Designation | Common Issue | | :--- | :--- | :--- | | | LAD711P | Shorted due to thermal stress or bad solder. | | Horizontal Output | Qxxxx (Usually near LAD) | Check for cold solder on pins. | | Flyback Transformer | Txxxx | Look for cracked solder joints on all pins. | | Source Resistor | Rxxxx (Low Value) | Opens up to protect the circuit; prevents startup. |
: With the board powered on, check for the following stable rails: Memory Power : +1.35V (for DDR3L) or +1.2V (for DDR4).