Ordinarily, I can remove all the screws underneath the laptop then gently pry off the top strip close to the screen then remove the keyboard and any additional screws underneath then gently pry the top cover off. This is often quite easy if I know the pressure points. On the Compaq Presario 900US, I can not seem to locate those points. My goal is to access the rear fan which is not spinning. I suspect a blockage somewhere or the fan has failed.
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Re: Replace fan in Presario 900US
Here is the service manual for your laptop. you will need the utility Winrar to open the file after you download the file. when you open the link scroll down to the bottom where the download button is.
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Remove the Power Cord, Remove the Battery. Close the LCD Lid then turn the laptop over. Look inside the battery case to see if there are any screws in there, if so remove them. Sometimes the keyboard might have screws inside the battery case too. If that's the case normally you will see the keyboard icon next to the screw. The purpose of removing screws in the battery case is there might be some that hold the strip that is above the keyboard in place.
You can look at the rest of the screws on the bottom of the laptop to see if you see any that might have the keyboard icon next to it. if so remove that screw. Also sometimes there might be a screw that holds the keyboard inside the memory slot or any of the other slots so just look for them. If you'd like you could just remove all the screws from the bottom of the laptop.
Turn the laptop back over after the screws are removed, then take a small flat head screwdriver and pry the strip that is above the keyboard aloose. Normally this strip has the power button on it. Be careful removing this strip because there will probably be a cable attached underneath it.
Once the strip is removed there might be screws that hold the keyboard in place a the top of the keyboard, if so remove them. Now you can just lift the keyboard out but be careful because there is a keyboard cable underneath the keyboard that has to be removed. If the keyboard does not just come out then more than likely there are little catches that help hold it in place either at the top or on the sides, just work with one side to pry it from the catches then you will be able to get the keyboard out.
The power button on these laptops is easily depressed underneath the power button strip especially when the switch becomes dirty, the screen doesn't light up, and the user gets frustrated. When I find a depressed button, I take the keyboard off by removing the 2 13mm screws with the keyboard emblem from the bottom and moving the 4 tiny plates between the esc-F1, F4-F5, F8-F9, & F12-delete keys. The power strip is then removed by gently prying up near the CPU and pulling it up and toward the front of the laptop. You can then either repair or replace the button or strip. I small drop of contact cleaner down into the switch will help it function reliably. Even a small drop of rubbing alcohol will sometimes work but contact cleaner is the best.
Take off the hard drive cover by
extracting the two screws that secure it and then taking it off. Take
out the screw on the modem and wireless card cover and take the cover
off. To remove the hard drive, shift it to the left to disconnect it
from the motherboard and pull it out of the computer. Gently disconnect
the Wi-Fi card antenna cables and take out the card. Extract the screws
on the modem card, disconnect it from the motherboard, and then
disconnect the cable to free it from the computer. Remove the optical
drive screw, push the drive out of the laptop and then take it off.
Extract the 15 screws out of the bottom of the laptop and turn the
Open the laptop and fold back
the LCD screen as far back as possible. Pry up the keyboard bezel (the
plastic strip above the keyboard) by inserting a flat-head screwdriver
or a spudger in the groove at the right side of the strip. Pull the
bezel off the laptop. Extract the keyboard screws and fold the keyboard
down over the palm rest. Release the flat cable that connects the
keyboard to the motherboard and take the keyboard off the laptop. Remove
the screws securing the LCD screen to the back side of the laptop.
Disconnect the video cable and the Wi-Fi cable from the motherboard and
remove the screws on the LCD screen hinges and then pull the screen off
the laptop. There are four visible cables that are connected to the
motherboard: the switchboard cable, the speaker cable and the touchpad
cable. Disconnect all three. Take out the four screws from the top cover
and pry the top cover off by running the flat-head screwdriver along the groove around the entire laptop and pulling it off.
Now the laptop is completely disassembled to where the motherboard is
exposed as the last remaining component.
Dunt open and close lcd too muh otherwise it will damge your lcd cover and lcd bezel than it will cost u more. Remove all lcd screw cap and remove screws than slowly pull out lcd bezel and check is really hinges is gone or screw is loose. For Key u have to check it that any of latch of behind key is broken or fine. If its fine than just put that parallel to other keys and press it. it will seat back on jumper.
I have opened dozens of these in the past and i have one in front of me at the moment...the easiest way to do it is. Get a blank white sheet of paper. Close your laptop and turn it face down. Remove all the screws underneath.As you remove the screws put them on the white piece of paper.So if you remove the screw from the top right then put the removed screw on the top right of the blank white page.
When you have all the screw removed the first thing to come off is the section at the on/off button (about 1nch thick covers the six buttons and has the display on it) Open the screen flat and fully extended.Remember at the back you will need to clip off on both side the grey plastic piece.(beside 2 usb connections and network port) when this section comes off you will see 2 screws underneath for the keyboard to come off...I think you will get it from here....
PS: watch out for the wireless button on the front left... this can pop off when putting it all back together....I'd say somewhere like maplin is a good place to look for one of these fans when you have it removed....best of luck
You need a flat bladded thin screw driver to prise off the long cover
the runs along the top of the keyboard and just below the screen. Make
sure you remove any screws at the back of the screen hinges, and along
the top above the battery housing (you need a small posidrive
screwdriver for this). You will find there is a screw on the underside
of the laptop that holds the keyboard in place from underneath, plus
two or three very small screws on the top at the screen end. When all
the screws are removed you can lift the keyboard up from the screen end
and pull (gently) away from the touch-pad end. Tilt it up and you will
see the keyboard data ribbon, don't twist it or pull it as you will