HP OMNIBOOK 4100 Service Manual page 48

7. Unplug the fan cable from the motherboard.
8. On the left frame, remove the screw that holds the plastic heat exchange cover. On an OmniBook
4150B, remove the second screw from the fan. Lift off the cover and fan – they are a single
assembly on the OmniBook 4150B.
9. On the left frame, remove the screw that holds the frame to the motherboard, then lift out the
frame.
10. Lift out the side air vent cover. If a finned heatsink is present at the left side of the case, lift it out.
11. On the right frame, remove the two screws that hold the frame to the case, then lift out the frame.
12. Remove the screw holding the motherboard at the back-right corner.
13. Unplug the DC-DC PCA from the right side of the motherboard.
14. Lift the front-right corner of the motherboard and remove the audio jack cover from the case.
15. Unplug the audio jack PCA from the motherboard. The metal shield comes off with the PCA.
16. Note the routing of the speaker wires. Then unplug the speaker wires from the motherboard.
17. Remove the two screws from the RAM/BIOS cover and remove it from the bottom of the unit.
Hint
In the next step, while removing the motherboard, reach through the RAM opening and separate
the case from the PCA. Otherwise, the PCA sticks in the bottom case.
18. Lift the front edge of the motherboard until it clears the hard drive compartment in the bottom
case and frees itself from the bottom case. Then slide the PCA forward and lift it out.
The docking doors may come out while you are removing the motherboard.
HP OmniBook 4100/4150 Removal and Replacement 2-25