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Use this quick-reference table during board-level diagnostics to verify component states: Test Point / Component Expected Measurement (Normal State) Fault Condition Indication 0V or fluctuating (Input short / bad Charger IC) PL302 Coil +3.3V (Always On) 0V or short to ground (Bad 3V PWM or EC short) PL303 Coil +5.0V (Always On) 0V or short to ground (Bad 5V PWM controller) PL1201 Coil +1.2V (When Powered On) 0V (Faulty RAM PWM or missing DDR_EN signal) Pin 8 of BIOS IC 0V (Missing +3V_SPI / power rail delivery failure)
Master Guide: Diagnosing & Repairing the BDL51 LA-D711P Rev 3.0 Laptop Motherboard The BDL51 LA-D711P Rev 3.0 bdl51 lad711p rev 30 schematic work
is a highly prevalent Compal-designed circuit board found inside mid-range budget laptops, most notably the (e.g., HP 15-BA009DX Go to product viewer dialog for this item. HP 15-ba505ur ) and the Go to product viewer dialog for this item.
If you are working on a specific repair with this board, let me know or what voltage measurements you have found so far so I can guide your troubleshooting. This public link is valid for 7 days
Once all voltages are stable, the PCH releases PLTRST# (Platform Reset), prompting the CPU to fetch code from the BIOS. 4. Common Failure Points and Troubleshooting Steps
On some LA-D711P revisions, the main 3.3V/5V power rails only rise after pressing the power button, provided the Embedded Controller (EC) is active. Embedded Controller (EC/Multi-Controller) Common Chip: SMSC MEC1404-NU or similar. Can’t copy the link right now
The KB9022Q receives +3VLP , reads its internal instruction code, and stabilizes the EC_RST# signal.
Because AMD APU platforms rely heavily on tightly paired firmware variables, mismatched or corrupted BIOS code often freezes the system before display generation. Desolder the SPI flash IC, back up the original binary data, and use an external programmer to flash a clean, verified BIOS corresponding directly to your motherboard's specific BID code.
Repairing this board requires tracing specific power "states" and rails: