If your laptop’s overheating and it’s fan is producing more noise then usual then perhaps it’s time to clean it’s insides. Over the time dust tends to accumulate on the inside layer of the heatsink preventing the fan to fan out all the hot air from the inside of the laptop. And thus all the heat remains inside, fan never stops working trying to do it’s job. Excessive heat also slow down the processor causing the programs to run slowly or even freeze.
If this is the case all you need to do is clean the dust layer from the heatsink. And here is how you do it on HP 6715b laptop. Please take caution since all electrical parts are very sensitive and can be damaged with improper handling. Also, almost all laptop manufactures have service manuals available for download on their support site so if you want more information, please see HP’s support website.
Heatsink is located on the just below the power button of the laptop. To reach it, keyboard, switch cover and fan need to be removed. Firstly shutdown the laptop, disconnect it from power source and remove the battery.
Turn laptop upside down and unscrew three screws (circled in RED on this picture). Two of them have a little keyboard icon next to them, and the middle screw is located below the center panel that hides memory module and WiFi Card. You must remove this panel by unscrewing another screw (YELLOW).
Now turn the laptop back and open it as much as possible. Locate four switches on the keyboard (RED on picture 2), pull them down and then just rise the whole keyboard towards yourself. The insides of the laptop are now revealed. Keyboard is attatched to laptop with a thin cable, but you can leave it alone as it won’t interfere. Left you can see the fan and just left from the fan is our goal.
Switch cover is the part just above the keyboard with all utility buttons and power button on it. First disconnect the ZIF connector by pulling the brown part up, and removing the thin cable from the connector as shown on picture 3. Now comes the hard part. Find the four slots just below the switch cover (RED on picture 4). You have to insert a flat tool inside one of these slots as shown here and push the whole cover off by force. You can use the screwdriver for this as shown on picture, or some other tool that gives you leverage and strength. It may take some time and right force to pry it out.
With switch cover out of the way, 2 screws holding the fan can be unscrewed (RED on this picture). Also, disconnect the fan from the board (YELLOW) and remove the whole fan out.
This will reveal the heatsink and the dust layer on it (last picture). Take the dust off and clean it as much as possible.
After you are done, just do everything backwards. reattach the fan, put the switch cover back (just push it back in and reconnect the thin cable), put the keyboard in place and tighten the screws on the back of the laptop. If by some chance your switch cover buttons don’t work, open everything again and check that thin cable is really connected.
And this should make your laptop quieter, faster and cooler :).