HP probook 4421s, probook 4420s, probook 4321s, probook 4320s that several laptop disassemble cleaning method is basically similar, seemingly complex , is actually very simple , here I am with HP ( Hewlett-Packard ) 4421s this model as an example to do a detailed graphical tutorial.
First look HP4421s appearance of this machine , whether positive or back , could not see a screw , is it a full- snap design ? Of course not , in accordance with standard procedures disassemble , remove the battery , you can see the four screws D shell , as shown in the red circle .
D shell removed after four small screws , turn over the books , C shell up, the direction of the red arrows in the figure , which is to push the screen orientation , remove the switch panel, switch panel below no cable, direct can be removed .
Remove the switch panel , you can see the screws that secure the keyboard , and press the red circle marked out the location of this four small screws , and then put forward the keyboard , which is the direction of the display gently pull , do not too much force , there is a row of the keyboard below the line .
After removing the keyboard, turn to the side of the keyboard , without removing the cable , then remove the red circle marked as position three screws .
Direction of the arrow shown in the figure below , from left to right to promote the laptop palmrest to release the buckle.
After releasing the palm rest of the snaps, flips up , removed the touchpad cable.
At this point, the laptop C shell basically Chai Wan , this time, the internal structure of the notebook has a glance , and demolition to some friends here know how disassembly and CPU heatsink fan , and continue to remove the red circle in the following figure identified six screws.
Remove the CPU fan above the metal bezel , you see the whole picture of the cooling system , first unplug the CPU fan power , then remove the CPU fan screws, lift up , CPU fan can be removed come.
Remove the screws CPU and graphics chip , the radiator is removed , the next clean up dust and coated thermal grease I believe we will , I will not repeat them here .
Hp probook 4421s CPU fan, CPU fan for hp probook 4321s