Keyboard Flex Cable G4

5. 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.

  1. Lay the computer right side up and open the display slightly past 90-degrees.
  2. 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 along the seam of the top and bottom case to help release the top case at the back sides (gently twisting the black stick may help).

11. Important: There is an hidden clip that secures the front of the top case. This clip must be released before the top case can be removed. The clip can be seen behind the optical drive felt, on the left side. Also, there are small slits in the top felt. The clip is behind the first slit from the left.

Use a black stick along the seam of the top and bottom case to add slight upward pressure so that the top case will pop up when the clip is released. Then insert a dental pick behind the clip and pull out slightly to release the clip and the top case.

12. With the top case released from the bottom case and lifted slightly so that it does not touch the bottom case, lift the front of the top case, pivoting along the back, to rest the top case against the display. Do not strain the cables connected to the logic board.

Important: Adjust the display so that there is no strain on the top case cables and so the top case will not fall forward.

  1. Disconnect the trackpad flex cable.
  2. Carefully disconnect the keyboard flex cable. Use a non-marring flat-blade tool to slide the locking bar back slightly on both sides.

Important: The keyboard flex cable is a Zero insertion force (ZIF) connector. The locking bar on the connector is extremely fragile and is not intended to separate from the connector. When releasing the bar, use extreme care and a restrained light pressure to move the bar only slightly.

Warning: If the locking bar breaks, you will need to replace the logic board.

Replacement Notes:

Make sure the locking bar is released, then slide the end of the flex cable all the way into the connector, above the locking bar. Hold the cable in place, then slide the locking bar into the connector on both sides to secure.

Important: Verify that the cable is straight. Use the markings on the cable as guides.

Warning: If the flex cable is inserted crooked, some signals may not be connected or signals may short together.

Note: If a cable is not securing properly, verify that it is inserted on the correct side of the locking bar.

15. Lift off the top case.

Replacement Procedure

Note: If replacing the top case, remove the keyboard and transfer it to the replacement top case.

  1. Visually check to verify that all cables are connected and routed correctly with nothing raised up or incorrectly over a component.
  2. Check perimeter wiring, where shown, to verify that it will not be caught or pinched by the top case during replacement.
Dvi Powerbook Lvds Cable Connections

3. Verify that the LVDS cable is secured with Kapton tape and lays flat.

Cable Connections

4. On the top case, check cable connections and routing.

Note: The top case below has the wires and connector for the fiber optics for the optional backlit keyboard (right side). This will not be present on some configurations.

5. Check that the perimeter metal tabs are not bent.

Note: The metal quickly fatigues and can break off easily. Be extremely careful to gently straighten tabs, if needed.

6. Lay the top case against the open display, as shown.

Titanium Video Resolder
  1. Connect the flex cables from the top case to the logic board.
  2. Lift the top case slightly and rotate it down over the bottom case (verify that the cables are folding properly) and align the corners.
  3. Start at the right corner and guide the top case onto the bottom case. Use a black stick to carefully pull or push tabs slightly, if needed.

Note: Some side screws have a flexible screw boss. If they block a tab on the top case from seating, use the pointed end of a black stick through the screw hole to push on the boss slightly.

Important: The tabs are fragile. Do not apply too much pressure or bend them.

Important: The top case should lay flat along the sides and top, if not, make sure that cables and components are not interfering.

Important: Screw order is vital for the proper attachment of the top case. 10. Reinstall the side screws in the order shown, below.

Replacement Note: Do NOT insert side screws into the DVI port screw holes. The screws can jam in the holes, requiring removing the logic board to remove.

  1. Close the computer, flip it over, and install the four back screws.
  2. Install the two screws in the memory bay.
  3. Install the memory door and four screws.
  4. Install the two screw in the battery bay.
  1. Replace the battery.
  2. Testing the computer should include powering on, checking the keyboard and trackpad function.

If the computer has the optional keyboard backlight feature, operate the computer in a darkened room to check for keyboard backlight function.

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