With the following instructions you will be able to disassemble a HP ProBook 4540s.
Also, this guide will work for HP ProBook 4440s and 4441s models.
I will show how to open up the case and access most important internal components.
Before you start, make sure the laptop is turned off.
Slide two latches towards each other to unlock the battery.
Lift up and remove the battery.
Replacement battery available here: https://ebay.to/39m7XHM
Slide same latches towards each other again to unlock the bottom cover.
Remove the cover.
Before removing anything else, I’ll show how to remove the keyboard.
I’ll start removing components located on the bottom in the step 11.
Remove three screws securing the keyboard.
Slide the keyboard towards the touchpad about 3 millimeters.
This will free up 5 tabs securing the keyboard on the top.
Lift up the top side of the keyboard as it shown on the following picture.
Turn the keyboard upside down and place it on the top cover.
In the following two steps I will explain how to unlock the connector and release the cable.
Lift up the left side of the cable retainer with your fingernail.
The retainer will open up at a 90 degree angle.
After the connector is unlocked you can pull the cable out.
Remove the keyboard.
Replacement keyboard available here: https://ebay.to/38oaOQJ
Now let’s remove components located on the bottom of the laptop.
Remove four screws securing the hard drive assembly.
Pull the hard drive to the left to disconnect it from the motherboard and after that remove the hard drive.
Remove one screw securing the optical drive, pull the drive to the left and remove it.
Remove two screws securing the cooling module cover.
Slide the cover to the left and remove it.
In HP ProBook 4540s the cooling fan can be easily accessed.
In order to remove the fan you’ll have to remove one screw and disconnect the cable.
NOTE: the fan must be removed in order to remove the top cover assembly as it shown in the step 25.
Remove the cooling fan.
Now you can clean it up from dust.
Replacement fans available here: https://ebay.to/2H7eZEl
Remove all screws from the bottom.
For these screws you’ll need a regular Phillips screwdriver and T8 torx screwdriver.
Remove two screws securing the top cover assembly.
Disconnect the following cables:
– Speaker cable (shown in step 21).
– Power button and finger reader cables (shown in steps 19-20).
Lift up the left side of the retainer to release the cable.
Pull the cable from the connector.
Unplug the white male connector from the brown female connector.
I found it’s easier to remove the top cover assembly if you separate it from the bottom cover on the back first.
Insert a guitar pick between the top cover and bottom cover and separate them each other.
Start removing the top cover as it shown on the following picture.
Again, the guitar pick will be very helpful to open up the case.
Before you remove the top cover completely it’s necessary to disconnect the touchpad cable.
Unlock the connector the same way you unlocked the keyboard connector earlier.
Remove the top cover assembly.
On the other side of the top cover you can access the following components:
– Utilities button board.
– Power button board.
– Both speakers.
– Finger reader board.
– Card reader.
In HP ProBook 4540s laptop the DC jack is attached to a cable.
In order to remove the DC jack you’ll have to unplug the cable from the motherboard.
Now you can remove the DC jack harness from the laptop.
Replacement DC power jack available here: https://ebay.to/2tH4sMY