Bdl51 Lad711p Rev 30 Schematic Work !!top!! May 2026

The BDL51 LA-D711P Rev 3.0 is a motherboard manufactured by Compal, primarily used in laptops like the HP 15-BA series and HP 255 G5.

Visual Inspection: Revision 3.0 boards often suffer from localized corrosion around the power management area. Pay close attention to the small resistors and capacitors near the BQ24725A. bdl51 lad711p rev 30 schematic work

• Input Stage: The schematic shows a fused AC input followed by an EMI filter (Common Mode Choke) to suppress high-frequency noise.
• Rectification: A bridge rectifier (designated typically as BR1) converts AC to DC.
• Regulation: Voltage regulators (often 7805 or similar DC-DC converters) provide stable logic rails. Key revisions in Rev 30 often include improved heat sinking or derating of these components compared to Rev 2x models.
• Service Note: Technicians should verify the "Power Good" signal presence at the MCU reset pin before proceeding with logic diagnostics.

Schematic analysis reveals two possibilities: The BDL51 LA-D711P Rev 3

Ensure the EC is receiving 3.3V and that the Power Button Signal (ON/OFF) reaches Pin 114. The voltage should drop to 0V when the button is pressed. Input Stage: The schematic shows a fused AC