Use a coin to turn the battery locking screw 90 degrees clockwise. Lift the battery out of the computer. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1389 Remove the four Phillips screws from the memory door. Slide the memory door away from the memory compartment. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1392 Remove the following 8 screws: Two 3 mm Phillips in the battery compartment, on either side of the battery contacts. Two 12 mm Phillips on either side of the memory compartment. Four 16 mm Phillips along the hinge. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1393 Rotate the computer 90 degrees clockwise, so that the power receptacle faces you. Remove the three 3 mm Phillips screws. When replacing these screws, you must place each screw in the correct order. Begin by installing the screw closest to the display hinge, and go out from there. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1394 Turn the computer 90 degrees clockwise so that the hinge faces you. Remove the bottom 5 mm Phillips screw on either side of the hinge (two total). /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1395 Rotate the computer 90 degrees clockwise, so that the ports face you. Remove the three 3 mm Phillips screws. When replacing these screws, you must place each screw in the correct order. Begin by installing the screw closest to the display hinge, and go out from there. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1396 Turn the computer over and open the display. Remove the two 1.5 mm hex screws in either corner, next to the display (a T6 Torx driver will work, but repeated use will strip the screws). /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1397 Grasp the back corners of the upper case and pull up. Do not pull the upper case off yet; you still need to disconnect the keyboard and trackpad cable. Lift the back of the case up and work your fingers along the sides, freeing the case as you go. Once you have freed the sides, you may need to rock the case up and down to free the front of the upper case. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1398 Rotate the upper case up and toward the screen, so that the upper case rests against it. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1399 Remove the orange tape securing the trackpad ribbon to the logic board. Disconnect the trackpad ribbon from the logic board. Remove the upper case from the computer. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1400 Remove the large silver Phillips screw from the top of the right ambient light sensor board. Remove the smaller black Phillips screw from the bottom of the board. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1425 Lift the right ambient light sensor board from the computer. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1426 Remove the two black Phillips screws from the right speaker. Lift the speaker away from the logic board and place it aside /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1427 Use your fingernail to flip up the black plastic flap locking the modem cable in place. Slide the modem cable from its connector. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1428 Disconnect the 13 indicated cables, removing tape as necessary. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1429 Remove the following 8 Phillips screws from the logic board: Three 6.5 mm in the upper left corner. Five 4.5 mm around the edges. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1430 Two cables still connect to the logic board and must be removed before pulling the board entirely out of the computer. Use a spudger to gently (very gently) pry up the left side of the logic board. If the logic board does not immediately come free, it may be necessary to soften the thermal paste between the logic board and heat sink. You can soften the thermal compound using a hairdryer. Move the hairdryer back and forth between the two fans about one inch above the logic board for one minute. At this point, the logic board should now come free easily. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1431 Disconnect the DC-In connector from the left side of the logic board. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1432 Disconnect the battery cable from the front, left corner of the logic board. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1433 Grasp the logic board at the left edge with one hand and at the thinnest section with the other hand. Lift the left edge of the board up to approximately a 30 degree angle (if you don't have your protractor handy, just lift until the DVI port clears the right hinge). Once the logic board clears the ports, slide it out to the left. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1434 Important. when you reinstall a logic board, you'll need to replace the thermal paste that goes between the processor on the logic board and the heat sink. Failure to remove the old paste and apply a new layer can cause the computer to overheat and sustain damage. The following steps refer to replacing the thermal paste between the processor and heat sink; follow these steps only when you are ready to place the logic board in the computer. Use a firm plastic edge to scrape the thermal material off the heat sink . Apply a new layer of thermal paste to the heat sink /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1435 Use a firm plastic edge to scrape the thermal material off the processor. When replacing the logic board, make sure all cables are routed around and above - not under - it, and to connect the two cables that do go beneath before pushing the board into place. Place the logic board back in the computer, trying not to move it around once the processor has come into contact with the newly-applied thermal paste. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1436 Remove the two small black Phillips screws from the left ambient light sensor board. Lift the left ambient light sensor board out of the computer, removing tape as necessary. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1437 Deroute the Bluetooth and RJ-11 cables from around the left side of the speaker. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1438 Disconnect the speaker cable from the DC/Sound card. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1439 Remove the 4 mm hex nut from below the left speaker. Remove the small black Phillips screw from bottom left corner of the speaker assembly, to the left of the battery compartment. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1440 Lift the speaker assembly (including the right speaker) out of the computer. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1441 Remove the Phillips screw from each corner of the PC card cage (4 screws total). The two longer screws go on the right side of the card cage. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1442 Lift the PC card cage up and remove it from the computer. When replacing the PC card cage, make sure you attach it to the post on the metal eject button. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1443 Remove the two silver Phillips screws from either side of the large orange Airport ribbon. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1444 Lift the Airport card out of the computer and slide a spudger between the card and the antenna connector to disconnect the cable from the card. Deroute the antenna cable from the side of the card, removing tape as necessary. You don't need to remove the Airport card entirely. We're just trying to free up the Airport antenna cable. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1445 Using a spudger, pry up the Bluetooth board from the cavity in front of the battery compartment. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1446 Disconnect the Bluetooth antenna cable from the Bluetooth board. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1447 Close the display and turn the hinge side of the computer to face you. Remove the remaining Phillips screw on either side of the hinge (two screws total). /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1448 Open the display and turn the computer so the screen faces you. Remove the T8 Torx screw closer to the display on either side of the hinge (two screws total). When replacing the display, make sure that the right screw pins down the ground loop from the display data cable. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1449 Be sure to support the display with one hand while removing the final two screws. Remove the longer T8 Torx screw remaining on either hinge (two screws total). /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1450 Lift the display off. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1451 Remove the following 7 Phillips screws from the heat sink: Four 4 mm silver screws. Two 5 mm black screws. One 9 mm silver screw in the upper left corner of the left fan. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1452 Remove the heat sink from the case, minding the left corner, as it tends to catch in the case (the fans will come out with the heat sink). /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1453 Remove the seven Phillips screws securing the fans to the heat sink. Lift the fans out of the heat sink. /Guide/Repair/PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Heat-Sink/353/all#s1454