My computer has been running a little hot of late and the CPU fan has been constantly running. So after a little research in to the possible causes, I decided to clean the CPU fan. Now, how do you do this? Well, you need to pull your laptop apart!!!!
I have a Dell Inspiron 5150, so I went off to the Dell website and located the Service Manual and then proceeded to shut the laptop and pull it apart. Pulling it apart isn’t too hard to do, a little fiddly with some of the screws if you have big fingers but not too hard. After pulling out the memory, CD Drive, hard drive, keyboard, removing the display and then removing the top cover (referred to as palm rest) I was able to see the cpu fan.
I gingerly loosened the screws as directed too ( it has the numbers 1 – 4 so you don’t get lost) and then tried to pull it out. It was a tight fit so I had to pull pretty hard to get it out but eventually it did. I then pulled the fan out of the unit and cleaned out the dust. There were decent size clumps in there let me tell you. So I cleaned all that up and thought I was doing a great job.
Placing the CPU unit back on to the board was a little difficult to do in that it was hard to push it back in so it sat firmly as it had done when I pulled it out. I was able to screw the screws in though so this is what I did. Ensuring that all the wires for the fan and the touchpad and the monitor were all back in place I put it all together again. Great I thought all done now to turn the little darling on and get back to work …
Oooooppppppsssss … mmmm why isn’t the monitor coming on … indeed why isn’t the harddrive being read … oh dear what the @#$@ have I done??? Maybe I haven’t plugged the monitor in properly. So I pull it all apart again and check the monitor … check the cpu fan – it was running when I started it but check it anyway, keyboard is plugged in … try it again … nothing. Oh dear!! After going over everything again and fiddling with the CPU unit to see if it was seated correctly several times with no luck, I decided to go to the local pc shop and get their assistance.
They were helpful in that they checked if the monitor was the issue or if the memory was damaged but they never pulled the laptop apart. So no real joy here as I walked out the door other than the thought of spending $$ to get a new laptop. The new laptop was a good thing … the spending the $$ on the other hand wasn’t such a good thing.
When I get back home, I thought well, it appears to be broken anyway so I may as well pull it all apart and look at it again .. and again .. and again. After pulling it all apart and then staring at the motherboard and the place the CPU sits, I noticed a little screw with two padlock symbols either side of it. I turned it … oh that little block move! I placed the CPU unit back in the laptop, and it fitted much easier this time. Interesting. I turned the screw with the little lock around to the lock position and low and behold the CPU was difficult to pull out. Ah ha he said … So putting the necessary bits back together without doing all the screws, I turned the laptop on and held my breath …
Eureka … we have a screen and writing on it … it is working
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So put it all back together and make sure it is working and it does so this is great. I am so relieved. I couldn’t believe that it could have been such a little thing. Evidently, the CPU was not seated on the motherboard properly because I hadn’t unlocked the screw holding it in. This screw is hidden down the side almost under the CPU unit and it is not mentioned in the service manual. So, be aware that if you are pulling the CPU out of your Dell – or any other computer – and it is difficult to come out, look for the little locking screw and make sure you lock it when you put it all back together again.
I have downloaded the Dell Inspiron 1100, 5100 5150 Service Manual and made a little edition to the document. Now this is not the official document of course but it is all sourced from the Dell site unaltered except for my little note about the lock screw.