Power Issues Power Adapter Dead No Power

  1. Make sure that power adapter connector is fully inserted.
  2. Remove any connected peripherals.
  3. Try known-good power outlet.
  4. Try known-good power adapter and power cord.
  5. Remove battery.
  6. Press Caps Lock key to see if light on key comes on. If it does, hold power button down for six seconds to shut down the computer and restart.
  7. Reset the power manager. See Knowledge Base document 303319, "Resetting MacBook Pro Power Management Unit (PMU)"

Warning: Make sure you do not hold down the "fn" key when resetting the power manager. Resetting the power manager means you will also need to reset the date and time (using the Date & Time pane of System Preferences).

  1. Reset PRAM (Press the power button, then hold down the Option-Command-P-R keys until you hear the startup chime at least one additional time after the initial startup chime).
  2. Remove any additional RAM
  3. Remove AirPort Extreme Card.
  4. Try known-good DC board.
  5. Verify cable connections and check cables for damage.
  6. Verify power button is connected properly to logic board, if power button is not functioning correctly or damaged, replace the top case.
  7. Replace logic board.

Inverter Connector P.67

LCD Panel P.67

Mini DVI & CRT Connector P. 69

Transition-Minimized Differential Signaling

Ethernet Connector P. 37

FW Connector P 39

USB 2.0 Connector P 42

Connector P 35

CPU Thermal Sensor P10

Processor 479 BGA P.7-9

Clocking Configuration and Spectrum P.32-33

Low Voltage Differential Signalling







ENET Controller P.36


FW Controller P. 38


Chipset-NB 1466UFCBGA P. 12-20






IR Controller P.41


66 MHz

16 bits

Internal KB TP Connector P. 40

Audio P.54-57


Chipset-SB 609 BGA P.21-26



SPI Flash Boot ROM P.50


Fan Connector P51

LPC Debug Connector P. 47




Connector to Batteries & Charger P. 64

Power Supply P. 58-P. 66

Study the block diagram to understand which I/O ports have a direct connection to the outside world and which ports have an I/O interface controller between the system I/O mapper and the outside world.

For example, let us say you are troubleshooting an AirPort connectivity symptom. Input to the AirPort Extreme Card comes from the MLB. Power and addressing of the card are necessary for it's operation. Microwave data output signal to the antenna is the desired output and this too is necessary for the card's operation. You have three components to check to discover fault with AirPort operation: MLB, AirPort Extreme Card, and antenna.

If installing a known-good AirPort Extreme Card restores operation, you need to focus on the original card. If the known-good card does not restore operation, you need to focus on the MLB or the original antenna.

When you focus on the MLB, from the block diagram, you can see that the MacBook (13-inch) AirPort Extreme Card is on the PCI Express bus. Investigate other devices on the PCI Express bus, such as the Ethernet controller. Determine if the Ethernet port is working. (System Profiler is a good tool to verify I/O.)

If the Ethernet port is working, the MLB is probably functioning; focus on the original AirPort antenna. As an additional test, if you can see both the known-good AirPort Extreme Card and original AirPort Extreme Card in System Profiler, suspect the antenna.

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