HP 4100 manual Removing the Motherboard or Bottom Case

Removing the Motherboard or Bottom Case

(HP Authorized Service Providers Only)

Required Equipment

∙Small Phillips screwdriver.

∙5-mm hex driver (or 3/16 inch).

Removal Procedure

1.Unplug the ac adapter, if present, and remove the battery.

2.Remove these additional assemblies:

∙Floppy module or other module (page 2-3).

∙Hard disk drive (page 2-5).

∙Keyboard (page 2-8).

∙Display assembly (page 2-10).

∙Top case (page 2-14).

3.Remove the screw from the heatsink cover and lift it off the heatpipe.

4.Remove the two screws from the CPU top plate, then lift the right half of the complete CPU assembly so it unplugs from the motherboard.

5.On the back of the case, use a 5-mm hex driver to remove the two standoffs from the VGA connector.

6.Lift the front of the VGA PCA to unplug the PCA, then slide it out of the case. (The LVDS PCA is attached.)

7.Remove the screw from the IR PCA and lift the PCA off the frame. Unplug the IR cable from the motherboard.

8.On the left frame, remove the screw that holds the plastic heat exchange cover, then lift off the cover.

9.Unplug the fan cable from the motherboard and lift out the fan.

10.On the left frame, remove the screw that holds the frame to the motherboard, then lift out the frame.

11.Lift out the side air vent cover and finned heatsink at the left side of the case.

12.On the right frame, remove the two screws that hold the frame to the case, then lift out the frame.

13.Remove the screw holding the motherboard at the back-right corner.

14.Unplug the DC-DC PCA from the right side of the motherboard.

15.Lift the front-right corner of the motherboard and remove the audio jack cover from the case.

16.Unplug the audio jack PCA from the motherboard.

17.Note the routing of the speaker wires. Then unplug the speaker wires from the motherboard.

18.Remove the two screws from the RAM/BIOS cover and remove it from the bottom of the unit.

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