HP Omnibook 300 425 430 530 Service Manual
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55 3. Remove the I/O Door and the four standoffs located on the I/O backplane (see figure below). 4. Two flat tip screwdrivers, or similar prying devices, are needed to remove the Top Case and Display Assemblies. Four plastic tabs hold the Top Case and Bottom Case together. Two tabs are located in each PCMCIA slot (see below illustration). Note, the screws seen in the PCMCIA slot do not need to be removed.Figure 10 - Backplane StandoffsFigure 11 - Bottom Case Tabs
56Place a prying device at a tab location between the metal and plastic of the Bottom Case (see figure below, left). Place another prying device in the PCMCIA eject button (see figure below, right). To release the tab, simultaneously twist prying device A while lifting on prying device B. Use caution with this maneuver, as the plastic tabs can break off the Bottom Case. If this occurs, the Bottom Case must be replaced. 5. Perform step four for each of the four tabs. 6. Once the Bottom Case tabs are released, the Bottom Case and Top Case are being held together only by the display cable and the two keyboard cables. Do not allow the Top Case and Bottom Case to separate at this point. The display cable and keyboard cables will be damaged if they are not properly disconnected. 7. Use a prying device to increase the separation of the Top Case and Bottom Case (see figure below). Do not separate the Top Case and Bottom Case more than 1 cm. A separation greater than 1 cm will damage the keyboard flex cables by pulling them out of the zero-force insertion connectors. The intent is to be able to view the display cable, located to the left of the ac adapter socket.Figure 12 - Bottom Case Prying LocationsFigure 13 - I/O Port Prying LocationPrying device “A”Prying device “B”Display Cable
57 8. With the separation increased slightly, the display cable can be disconnected using a probe. Use caution to keep the OmniBook on a level surface. With the Top Case partially separated, small internal parts may dislodge when the OmniBook is tilted at a sharp angle. Place the probe at the base of the display cable connector between the two rows of pins. Use a rocking motion to lift the cable from the connector. See the below illustration for proper placement of the probe. 9. With the display cable removed, the Top Case and Bottom Case can be opened partially to gain access to the keyboard flex cables (see below illustration). Do not open the unit completely as this will damage the keyboard flex cables by pulling them out of the zero-force insertion connectors. Open the zero-force insertion connectors and remove the keyboard flex cables. The Top Case can now be removed completely from the Bottom Case.Figure 14 - Disconnecting Display Cable
5810. To separate the Keyboard from the Display, five grounding eyelets must be removed from the display posts (see below illustration). Use caution when removing the grounding eyelets, as they can be broken off easily. If this happens, the assembly must be replaced. To prevent the eyelets from breaking, bend the grounding eyelet tabs at the farthest point from the eyelet.Figure 15 - Keyboard Flex CablesFigure 16 - Display Grounding EyeletsProper Tab Bend
59 11. To remove the Display from the Top Case, the display cable and two grounding cables must be guided through the holes in the Top Case. Replacement Procedure 1. Guide the display posts, display cable and two grounding cables on the Display through the holes in the Top Case. 2. Replace the grounding eyelets over the display posts (see Figure 16). Use caution when replacing the grounding eyelets, as they can be broken off easily. If this happens, the assembly must be replaced. 3. Press the Display and Top Case firmly at each display post to snap the assembly in place. 4. Position the Top Case and Display Assembly over the Bottom Case and insert the two keyboard flex cables into the zero-force insertion connectors. Ensure the connectors are fully closed. Once the keyboard flex cables are secured in the connectors, do not allow them to be pulled out. This will damage the cables.
605. To reconnect the display cable, position a probe in the cable as shown in the below illustration. 6. Use the probe to connect the display cable into the connector as shown below. Use caution to keep the OmniBook on a level surface. With the Top Case partially separated, small internal parts may dislodge when the OmniBook is tilted at a sharp angle. 7. With the display cable reconnected, the I/O grounding eyelets must be slid into place. Use caution when positioning the I/O grounding eyelets as they can be broken off easily. It is acceptable to reassemble the OmniBook with certain I/O grounding eyelets broken if there is at least one eyelet in each of the four positions AND at least two matched sets remaining. See Figure 19, Figure 20, Figure 21, and Figure 22 for examples.Figure 17 - Display Cable Probe PositionFigure 18 - Reconnecting Display Cable
618. Open the display and firmly press the Top Case and Bottom Case together around the entire parameter of the OmniBook. This will lock the tabs of the two cases. 9. Replace the seven screws and four standoffs and the remainder of the components.Figure 19 - I/O Port Eyelets (all present)Figure 20 - I/O Port Eyelets (two matched sets)Figure 21 - I/O Port Eyelets (only one matched set)Figure 22 - I/O Port Eyelets (no eyelet in position one)Acceptable to reassemble All eyelets are present.Acceptable to reassemble There are two matched sets and at least one eyelet in each position.Not acceptable to reassembleThere is only one matched set.Not acceptable to reassemble There are two matched set, butno eyelet in position one.
62Keyboard (HP Authorized Service Providers Only) Required Equipment · Appropriate ESD station · Torx #6 screwdriver · Two small flat tip screwdrivers (or similar prying devices) · Probe Removal Procedure 1. Follow the Display Removal Procedure to separate the Display and Top Case from the Bottom Case. 2. Once the Display is removed, the Keyboard must now be separated from the Top Case. Hold the Top Case and Keyboard Assembly exactly as shown in the below illustration. 3. Apply even upward pressure with the fingers of the left hand. At the same time use the tip of the thumb of the right hand to twist the backside of the Top Case icon panel inward and toward the keyboard. There will be a slight bending in the plastic of the Top Case. This is normal and will not damage the assembly. Replacement Procedure 1. To replace the Keyboard, snap it into the Top Case. Ensure the entire perimeter of the Keyboard is securely snapped into place. 2. Follow the Display Replacement Procedure to replace the Display and remaining components.Figure - Keyboard Removal Hand PlacementTop Case and Keyboard Assembly (upside down)Backside of the Top Case icon panel.Keyboard (upside down)
63Logic PCA Board (HP Authorized Service Providers Only) Required Equipment · Appropriate ESD station · Torx #6 screwdriver · Two small flat tip screwdrivers (or similar prying devices) · Probe Removal Procedure 1. Follow the Display Removal Procedure to separate the Display and Top Case Assembly from the Bottom Case. 2. Remove the Eject Arms (both right and left) and Mouse Button Latch and Spring (see below illustration). Note, the Mouse Latch Spring is very small and can be misplaced easily. Figure 23 - Logic Board PCA RemovalMouse Button LatchEject Arm LeftEject ArmRightEject Button AEject Button BEject ArmSpringEject ArmSpringScrew M2x4.6mm(T6) (Qty 5)Mouse Latch SpringPaw Carrier Flex Cable SlotLogic PCA
643. The Eject Buttons and Springs do not need to be removed to gain access to the Logic Board. However, because they can be dislodged easily, setting them aside is recommended. 4. Remove the Paw Carrier Flex Cable from the zero-force insertion slot. 5. Remove the five (5) screws from the Logic Board (see previous illustration). 6. The Logic Board can now be lifted from the Bottom Case. Replacement Procedure 1. To replace the Logic Board, reverse the steps in the Removal Procedure. Ensure the Paw Carrier flex cable is positioned properly – the end of the cable should be folded along the holes in the cable. This folded portion then needs to be placed between the posts and guided on the bottom case. 2. Follow the Display Replacement Procedure to replace the Display and remaining components.