Dv15: Mlk Mb 112801 Boardview Updated

: Use OpenBoardView’s color-coding to mark power rails: Red for +VBAT , Orange for +3VALW , Blue for +5VALW , Green for signals.

| Symptom | Suspect Area | Component to Check (via BoardView) | Typical Fix | | :--- | :--- | :--- | :--- | | No power, no LED | DC input circuit | PC101 , PL101 (first inductor after DC jack) | Replace shorted capacitor | | Powers on, no display | Vcore regulator | PU501 (ISL95833), PR501 (feedback resistor) | Re-solder or replace PU501 | | Fan spins, no POST | BIOS corruption | U601 (BIOS chip), search for SPI_MISO net | Flash updated BIOS via programmer | | No battery charging | Charger IC I2C bus | PR301 , PR302 (pull-ups for SMBus to EC) | Replace corroded resistors | | Intermittent shutdown | Temperature sense | RT601 (thermistor net TH_PROCHOT# ) | Replace thermistor or clean area | dv15 mlk mb 112801 boardview updated

So combined:

: If you are using updated boardviews to repair or understand a motherboard, this paper provides the "big picture" of how hardware is secured (and broken) at the circuit level. Key Topics : : Use OpenBoardView’s color-coding to mark power rails: