Bdl51 Lad711p: Rev 30 Schematic Work

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.

While direct downloads are restricted on many professional forums, technical files are often shared in community groups: Technical Communities : Sites like Elektroda.pl bdl51 lad711p rev 30 schematic work

Primary Power Rail (19V): Verify that 19V is present at the input and passing through the first and second MOSFETs (often labeled PQ4 or similar). The BDL51 LA-D711P Rev 3

2.3 Power Factor Correction (PFC)

• Controller: U602 (e.g., FAN7530 or L6562).
• Key components: Boost inductor (L602), PFC diode (D605, fast recovery), MOSFET (Q601, e.g., 20N60).
• Expected voltage: After PFC active → ~390V DC across main cap.
• Common failure: The PFC diode shorts, blowing the main fuse. The schematic will show a current-sensing resistor (R611) between the MOSFET source and ground.

Analog front-end / ADC

EC_ON: Signal from the KB9022Q multi-controller to enable main rails. +3VALW / +5VALW: "Always-on" standby voltages. Controller : U602 (e

BDL51 LA-D711P Rev: 3.0 is a motherboard commonly found in the HP 15-ba series

AC Detection: ACIN signal (tells the system an adapter is connected). 3. Common Fault Components