Keyboard

This procedure requires the following tools Black stick or other nonconductive nylon or plastic flat-blade tool 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...

Computer beeps three times at startup

Three beeps means that no RAM banks passed memory testing. 2. If a RAM card is installed in the upper expansion slot if not, skip to next step , remove it and restart. If symptom does not repeat, replace RAM card. If symptom repeats, replace RAM in lower RAM slot with known-good and compatible RAM card and restart. If symptom repeats, replace logic board. 3. If a RAM card is not installed in the upper expansion slot, replace RAM in lower RAM slot with known-good and compatible RAM card and...

Resetting the Power Manager Unit PMU

The PMU reset button has been removed from the logic board. Use the following key combination procedure or the PMU Reset pad see PMU NMI and PMU Reset pads on logic board, below . 1. If the computer is on, turn it off. 2. Reset the power manager by simultaneously pressing and then releasing Shift-Control-Option-power button. Do not press the fn Function key while using this combination of keystrokes. 4. Press the power button to restart the computer.

Hardware Troubleshooting Tools and Tips Apple Hardware Test AHT

Diagnostic Tools Used Apple

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...

Procedure

Helligkeitssensor Powerbook

To remove the left ambient light sensor board, remove the two screws, and disconnect the connector from the logic board. 2. To remove the right ambient light sensor, remove the two screws, then lift up on the ambient light sensor board to disconnect it from the logic board the connector is on the bottom of the board . Note The sensor assembly consists of two pieces the sensor board and a lens cover. Replacement Note Assemble the replacement sensor board and lens cover before installation. 3....

Keyboard Flex Cable G4

Titanium Video Resolder

With the display open, rest the computer on one side. Remove the three screws. 6. Turn over the computer and remove the three screws on the other side. 7. Open the computer slightly and rest it with the back facing up. Remove the two top screws along the back. Note Do not remove the bottom screws. 8. Lay the computer right side up and open the display slightly past 90-degrees. 9. Remove the two hex screws at the back corners of the top case a Torx T6 can also be used . 10. Use a black stick...

Power Adapter Note

The system was designed to use the Apple 65-Watt Portable Power Adapter that came with your computer. The previous 45-Watt Apple power adapter for PowerBooks is plug compatible, but it may not provide sufficient power during some activities and power may be drawn temporarily from the battery. You can identify the Apple 65W Power Adapter by its markings see photo . Under low battery or no battery situations, the 45 watt power adapter may not be able to provide enough power to properly support...

Warning Whenever the logic board is separated from the heatsink you must remove and install new thermal material to the

Powerbook Thermal Fuse

Use a black stick to remove the original thermal material, shown below, then clean the surface vigorously with an alcohol pad to completely remove all of the material. 5. Install new thermal pads onto the heatsink where removed, as shown below. Center each pad over the location that corresponds to the chip on the logic board and press into place, avoiding air pockets. Remove protective backing, if present. Note The two larger pads are interchangeable. Important Avoid unnecessary contact with...

Wire and Flex Cables

With the very thin enclosure design and dispersed circuit board, a large number of flex cables are used in this computer. In addition, there are a variety of wire cable harnesses as well. Many of these cables carry multiple types of signals. Here is a list of the cables and the signals that run across them. If you notice a group of functions not working, it is likely that the cable is not properly inserted or the connector is damaged. AirPort Extreme Bluetooth antenna assembly in display...

Warning Flexing of the logic board can break solder joints to parts To prevent damage to the board guard against flexing

Powerbook Thermal Fuse Logic Board

Remove the two screws and move the right speaker and wire down away from the logic board. Note If a right ambient light sensor board was removed, that procedure already removed the upper right logic board screw. 4. Important Thermal material on the bottom side of the board, between the board and heatsink, may make it difficult for the board to release. Verify that all screws have been removed, then use a black stick to apply light, slow, upward pressure under the left side of the logic board...

Warning Resetting the power manager will permanently remove a RAM disk if present and all of its contents You will also

Press Caps Lock key to see if key light comes on. If it does, hold power button down for six seconds to shut down the computer and restart. 7. If it still doesn't start, verify power button cable is connected properly to top case flex cable assembly and that the flex cable is connected correctly to the logic board, if power button is not functioning correctly or damaged, replace the top case. 8. Disconnect keyboard completely. Inspect connectors. Restart with keyboard disconnected. 10....

Take Apart

Powerbook Video Chip

Some key features that distinguish this computer from earlier PowerBook models include New aluminum alloy enclosure Uses double-data rate DDR memory Optional AirPort Extreme card Optional fiber optic backlit keyboard with ambient light sensors If you are familiar with taking apart notebook computers, there are a few critical differences Important The top case removal has two critical removal steps - A hidden latch behind the optical drive felt must be disengaged with a tool before lifting off...