No display or dim display but computer appears to operate correctly

Remove any connected peripherals. 2. Make sure F1 key is not stuck down. 3. Press the F2 key with the fn key pressed and not pressed to increase the screen brightness settings. 4. Reboot the computer hold down the Control and Command keys and press the Power button to restart the computer. Or, press and hold the Power button for 5 to 10 seconds to shut down the computer, then press the Power button to restart. 5. Important The Apple 65W Power Adapter is highly recommended be used with the...

The battery wont charge

Remove any externally connected peripherals. 2. Try known-good power outlet. 3. Connect known-good 65W power adapter 661-3048 and power cord or plug make sure the DC plug is firmly inserted. The DC plug should light up, if not, replace Sound DC-in board. If the power adapter light is green, turn over the computer and press the battery button. The battery lights should glow green and stay on if the power adapter is operating correctly. Important The Apple 65W Power Adapter is highly...

Apple Hardware Test AHT

Starting with the PowerBook G4 17-inch , the Apple Hardware Test software will be incorporated into the Software Install and Restore DVD. There is no separate CD for this diagnostic. Note Currently, these DVD images are not posted on Service Source online. Previously, the C key was held down to boot into the diagnostics. With the combined DVD, this action will boot into the software restore section of the disk. In order to access the AHT on the DVD follow these steps 1. Insert the DVD named...

A USB device not recognized by computer

Note If you are trying to use a serial device with a USB Serial adapter, check with the manufacturer of the adapter for compatibility. 1. Completely shut down, then press the power button to start the computer. 2. Verify current driver for the device is installed. 3. If a camera, turn on camera after initiating download with camera application. 5. Try different USB device on same port. 6. Eliminate chain by plugging in only one peripheral. 7. Try known-good Apple USB keyboard or mouse to verify...

Poweron pads on logic board

With the top case removed, the power-on button is disconnected. Instead of having to reconnect the top case to turn on the system, there are two pads on the logic board when shorted together with a tool like the head of a flat blade screwdriver is the equivalent to pushing the power-on button. These pads are located near the edge of the logic board, just above center of the hard drive. It is marked POWER BUTTON. The pads are separated with a vertical white line.

Preliminary Steps

Powerbook Inch Backlight

Before you begin, remove the following Note There are two different keyboards and top cases used with this computer, depending upon the configuration, either backlit or non-backlit. Important Verify that the correct replacement keyboard is ordered, and or top case if replacing. The keyboards are not interchangeable, and damage could result. The top case for the backlit keyboard has the fiber optics and connector right side . The keyboard for the backlit top case has icons on the F8 to F10 keys...

Powerbook G4 15 Inch Logic Board Replacement Thermal

Powermac Mdd Logicboard Replace

Warning Flexing of the logic board can break solder joints to parts. Guard against flexing, to prevent damage to the board. 2. Remove the two screws holding the right speaker and move the speaker and its wires down and away from the logic board. 3. Remove the logic board screws, shown. Note If a right ambient light sensor board was removed, that procedure already removed the upper right logic board screw. 4. Important To prevent damage to the logic board chips, the thermal material between the...

Apple Service Diagnostic ASD

Since the PowerBook G4 15-inch FW 800 is a Mac OS X only system, MacTest Pro software does not work on this computer. As a replacement, Apple System Diagnostic will be delivered to service providers and can be downloaded from Knowledge Base article 112125 Service Diagnostics Matrix. Important ASD is not backward compatible with PowerBook computers prior to the PowerBook G4 1GHz 867MHz . Ty Test Controls Select Tests f Wlnfo Teit Log ft Stop On Error Coittfnuc On Error Apple Service Diagnostic...

Restart dialog box appears Mac OS X kernel panic window or Gray screen during startup

Moid down the Power button for several seconds or press the Restart button. Veuillez red marrer votre ordinateur. Maintenez la oucbe de d marrage enfonc e pendant plusieurs secondes ou bien appuyez sur le bouton de r initialisation. Sie m ssen ihren Computer neu starten. Halten Sie dazu die Linschalltaste einige Sekunden gedr ckt oder dr cken Sie die Neustart-Taste. 1. Make sure all external devices are disconnected and any PC card ejected. If kernel panic...

Safe Mode

The Mac OS X that shipped with the PowerBook G4 15-inch FW 800 , has a new startup state called Safe Mode. Safe Mode is the state Mac OS X is in after a Safe Boot. A Safe Boot is a special way to start Mac OS X when troubleshooting. Starting up into Safe Mode does three things to simplify the startup and operation of your computer 1. It forces a directory check of the startup boot volume. It is identical to using Disk Utility's Repair Disk or the fsck -fy terminal command. 2. It loads only...

Flashing question mark appears on the screen

Note This system will only boot the Mac OS X system that shipped with this computer or later. It does not support booting into Mac OS 9. 1. Start up from the software install and restore DVD that came with the computer hold down the C key during restart . 2. When the Installer opens, from the Installer menu, select Open Disk Utility. 3. When the Disk Utility opens, on the left hand side, all disk and volumes are listed. If you don't see the internal hard drive, the system is not recognizing it....

Memory error message The builtin memory test has detected an error appears on the screen

Run Apple Service Diagnostic Test. Note If the failure is intermittent, run Apple Service Diagnostic Test in loop mode check looping options under Test Controls tab and select only the RAM test under the Select Tests tab for an extended time to test the memory. 2. If the test can't find the memory or finds bad memory, inspect the bad DIMM. Verify proper memory is being used. The PowerBook G4 15-inch FW 800 uses PC2700 also called DDR333 DDR SDRAM SO-DIMMs with a maximum height of 1.25-inch...

No sound from speakers

Use the Software Update system preference pane to verify that the latest audio update has been installed. 2. Press the F3 key with the fn key pressed and not pressed to verify that mute mode is not enabled. 3. Press the F4 or F5 key with the fn key pressed and not pressed to check the volume setting. 4. Verify no external speakers or headphones are plugged in. 5. Check the speakers tab on the Sound control panel to confirm that the software is correctly seeing that there are no external...

A USB port is not recognizing devices

Completely shut down, then press the power button to start the computer. 2. Use Software Update system preferences to verify that the latest software is installed. 3. For USB, test ports with an Apple keyboard or mouse. If the left port is not recognized check the Sound DC-in flex cable's condition and connection. If the right port is not recognized check the backup battery flex cable's condition and connection. 4. If the USB flex cables are fine, replace the Sound DC-in board for the left...

Display latch not working

Note When the display is being closed, a latch hook in the top of the display housing should be magnetically pulled down through the slot in the top case and secured by the latch mechanism. When the latch button is pushed, the hook should release and retract into the display housing. 1. See the Latch Adjustment chapter in the Adjustments section of this service manual to verify the latch mechanism and latch hook operation and make adjustments, if necessary. 2. If the latch hook is broken,...

Fire Wire port is not recognizing devices

Test the FireWire 400 and FireWire 800 ports by connecting to another computer using FireWire Target Disk Mode. Refer to Knowledge Base article 58583 How to Use FireWire Target Disk Mode. Important When in FireWire Target Disk Mode, use only one FireWire port at a time. Otherwise you risk corrupting the internal hard drive volume. 2. Verify that drivers are installed properly for third party, if needed. 3. Make sure the cables are firmly attached. 5. If self powered make sure that the power...