Bdl51 Lad711p Rev 30 Schematic Work Repack ✦
; drops to 0V upon pressing power button. Missing authorization signal from EC or corrupt firmware.
The motherboard, manufactured by Compal for HP (often found in HP 15-ba series laptops, such as the 15-ba505ur and 15-BA009DX), is a common AMD-based platform. Troubleshooting this board requires a detailed understanding of its schematic, power rails, and sequence. This article serves as a technical guide for technicians and enthusiasts navigating the LA-D711P schematics for repair. 1. Introduction to the LA-D711P Rev 3.0 Board
If you discover a short circuit on the main B+ rail, configure your bench power supply strictly to 1V DC with a 2A limit . Inject this low voltage into the shorted rail while monitoring the circuit board with a thermal imaging camera. The failed MLCC component will glow hot under thermal analysis. bdl51 lad711p rev 30 schematic work
Re-flash the chip and the KBC chip with a working software file. A corrupted BIOS often causes this issue. 3. Water Damage
Probe pin 114 on the EC to see if the button press registers. Reflash the EC ( ENE_9022.bin ) using an external programmer. , but no display output appears. ; drops to 0V upon pressing power button
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 EC processes this drop on pin 114 and issues the wake triggers. The main 3.3V and 5V power inductors switch on. Introduction to the LA-D711P Rev 3
| Component Label | Type | Typical Value | Failure Mode | Substitute | | :--- | :--- | :--- | :--- | :--- | | F801 | Fuse | T3.15A / 250V | Blown | Same rating, slow-blow | | IC601 (Standby) | VIPer22A | DIP-7 | Short from VDD to GND | VIPer22A (STMicro) | | R821, R822 | Startup resistors | 2 x 2.2MΩ (1/4W) | Open circuit (no 5VSB) | 2 x 2.2MΩ or 1 x 4.7MΩ/0.5W | | Q701 (LED MOSFET) | N-Channel | 8N60 (8A, 600V) | Drain-source short | 10N60, 12N60 | | R861, R862 | Sense resistors | 0.33Ω / 2W | Open or changed value | 0.33Ω, 0.27Ω, or 0.39Ω (keep pair matched) | | C801 (Main cap) | Electrolytic | 100µF 450V | Bulging, low capacitance | 120-150µF, 450V, 105°C |
This is one of the most frequently reported issues. When the laptop shows no signs of life, the problem often originates in the initial power-delivery stages:
The is a motherboard produced by Compal, primarily found in the HP 15-BA series and HP 255 G5 laptops. Finding the exact revision 3.0 schematic can be challenging, as technicians often use the BDL50 LA-D704P schematic as a close reference for power rail troubleshooting. Core Technical Specifications
The is a robust but repairable power supply board. The key to successful repair lies in methodical schematic work: understanding the three distinct power domains (standby, main, LED driver) and recognizing common failure patterns like open startup resistors or triggered protection modes.
