In this guide I’ll be taking apart an Acer Aspire 3620 laptop.
This particular computer
was shutting down by itself while running some intensive applications. I found that the cooling module (heat sink and fan) is completely clogged with dust and needs a good cleaning. Unfortunately, in this model the cooling module is buried deep inside the laptop case and it’s necessary to take the whole thing apart in order to access it.
First of all turn off the computer, unplug the power adapter and remove the battery.
Remove the hard drive and memory covers from the bottom.
Remove four screws securing the hard drive assembly. After that slide it to the left and disconnect it from the motherboard. Now you can remove the hard drive assembly .
If you are replacing the HDD, you’ll have to transfer the mounting bracket to the new one.
Remove both memory modules.
Disconnect two antenna wires from the wireless card (two yellow circles) and remove the wireless card.
Remove one screw securing the CD/DVD drive. Push the drive from the laptop with a screwdriver.
Pull the drive out and remove it.
Remove all screws from the bottom.
Disconnect the cooling fan cable from the motherboard.
Start removing the keyboard bezel as it shown on the picture below. Be careful, the bezel has a circuit board which is connected to the motherboard.
Place the bezel so you can access one screw securing the keyboard and remove it.
Lift up the keyboard and place it upside down on the palm rest.
Before you can remove it completely, you have to disconnect the cable.
On the picture below you see the keyboard cable connected to the motherboard.
In order to unlock the connector, move the brown retainer about 2-3 millimeters towards the palm rest.
Do not disconnect the retainer from the connector, it must stay attached to the base.
On the next picture you can see the same connector in the unlocked state. Now you can pull the cable and remove the keyboard.
By the way, if you are only removing or replacing the keyboard, you can follow steps 6-8. You don’t have to remove anything from the bottom.
Disconnect the cable connecting the bezel to the motherboard and remove it.
This cable belongs to the power button board which is attached to the bottom part of the bezel.
Pull the wireless antenna cables through the opening in the top cover.
Disconnect the video cable from the motherboard. Remove two screws securing the display panel.
Now you can remove the display panel assembly.
In the next post I will explain how to remove the screen.
Disconnect two white cables from the motherboard same way you disconnected the keyboard cable.
Start separating the top cover assembly from the bottom cover.
Remove the top cover assembly.
Remove five screws securing the laptop motherboard.
Disconnect the speaker cable.
Start removing the motherboard from the left side as it shown on the picture below.
It has been removed.
On the next picture you see the bottom part of the motherboard.
The cooling fan is attached to the base assembly and can be easily removed and replaced now.
Now I’m going to remove the heat sink.
Remove five screws securing the heat sink and carefully lift it up.
As you see, the heat sink is completely clogged with dust. I’m going to use compressed air to clean it.
If thermal grease on the top of processor looks dry, you’ll have to replace it with new grease. Otherwise, you can reuse old grease, just spread it evenly on the top of the processor and install the heat sink back in place.