Based on field repair data, these parts fail most often on :
Enters through the DC jack and passes through input MOSFETs (often BQ24725A or similar charging IC control).
No power, no display, power-on-no-display (POND), charging failure. 2. Key Power Rails in the Schematic
Secondary rails that feed the RAM modules and the internal logic processing blocks of the AMD APU. bdl51 lad711p rev 30 schematic work
To begin troubleshooting, you will need two essential files:
Check +CPU_VCORE stability on the processor chokes. If voltages look solid, reflash the main 8MB SPI System BIOS. 4. Cross-Reference Tip for Technicians
The motherboard is typically paired with an AMD processor and DDR3L memory. While exact schematics for Rev 3.0 can be difficult to locate, they often share power rail designs with earlier revisions like Rev 1.0 or similar Compal "LA" series boards. Compal Model Number: BDL51 Board ID: LA-D711P Common Applications: HP 15-BA018WM, HP 255 G5 Common Faults and Diagnostics Based on field repair data, these parts fail
A common failure point is the charger chip protection diode (often a dual Schottky SOT323 package). If this fails, the laptop won't switch to AC power. Always On (Standby) Circuit: rails for the Embedded Controller (KBC/IO) and BIOS chip. Embedded Controller (KBC/IO Chip):
Power enters through the DC jack and must clear the protection logic before traveling to the rest of the board.
The is a motherboard revision commonly found in HP 15-BA series laptops, powered by AMD processors. Navigating its schematic is a technical process essential for chip-level repairs, such as fixing "dead" boards or "no display" issues. 1. Understanding the Schematic Structure Key Power Rails in the Schematic Secondary rails
Analog front-end / ADC
If Rev 3.0 is unavailable, the LA-C801P or LA-D704P schematics are often cited as being nearly identical for circuit tracing.
Ensure the EC is receiving 3.3V and that the reaches Pin 114. The voltage should drop to 0V when the button is pressed.