Having problems with your HP Pavilion dv4000 Notebook ?

My HP Pavilion dv4 laptop has a humming noise

\015 My HP Pavilion dv4 laptop fell onto the ground from about 2 feet up. Everything works just fine, but I think ever since then my laptop has had a pretty loud humming noise. I'm not sure if the drop caused it, or if it's been like this since I got it a year ago and I never noticed until now. It's much more audible than other laptops in the library for sure. Just wanted to know if this is typical of this laptop.\015

Answers :

There are three components in this laptop that move. (Spin)
1.Cooling Fan
2.Harddrive
3.CD/DVD drive

A.It isn't the harddrive making the noise.

Inside the harddrive case are Platters. Platters resemble a CD disk, and are made of metal.
Typically there are 3 to 6 Platters inside.

For Each Platter there is a Read/Write Head, on the top surface of the Platter, and on the bottom surface of the Platter.

The Read/Write Head is connected to an arm. This arm moves the Read/Write Head across the Platter, and back to the home position. (Action resembles that of a phonograph player, with a record on it)

The Read/Write Head is located at the park position, (Away from the outside edge of the Platter), when the power is off to the computer. (Desktop or Laptop)

When the harddrive is in use, the Read/Write Head is approximately 1/2 thousandths of an inch above the Platter surface. (.0005 A typical human hair is 3 thousandths thick, or .003 Therefore the Read/Write Head is 6 times closer than the thickness of a human hair)

If your laptop is operating okay, the harddrive is unhurt.

[More detailed info with illustrations, in case there is an interest,

http://computer.howstuffworks.com/hard-disk.htm ]

B.It isn't the CD/DVD drive because the extraneous noise happens all the time.

C.It's the Cooling Fan

The Cooling Fan is located on the bottom side of the laptop.
It's a small fan with tiny bearings, and can easily be damaged.

The fan blades could be hitting the fan shroud of the housing. (Shroud - Outside cage that surrounds the fan)
It is also mounted in a plastic housing that is rounded in shape, and has three protrusions that come out from the housing for mounting.
(Mounting to the motherboard)

These protrusions resemble 'Ears'.
One, or more of the Ears could have broken off.
The fan blades could be hitting the Base Enclosure. (Plastic bottom housing of laptop body)

This link is to HP Support, and the download page for the Maintenance and Service Guide, for the HP Pavilion dv4000 Series Notebook PC's.

http://h10025.www1.hp.com/ewfrf/wc/manualCategory?lc=en&dlc=en&cc=us&lang=en&product=468789&

[On this page Left-click on - HP Pavilion dv4000 Notebook PC and Compaq Presario v4000 Notebook PC - Maintenance and Service Guide

After you click on the link you may not see anything happening for up to 30 seconds. This PDF file is downloading in the background.
Advise do not start looking through it until it has fully downloaded.
You may break the download connection if you do ]

This will show you the Cooling System, and more specifically the Cooling Fan, and housing.

Page 177 starts with replacing the Fan Assembly.

The entire laptop has to be disassembled, except for the display to access the Cooling Fan assembly.
(Top cover is the Display Enclosure. The LCD screen fits in the Display\015\012Enclosure, and is mounted with a metal frame)


It most likely is the fan that may have become loose from its socket because of the fall. There are no other moving parts other than HDD. If it was HDD then the laptop probably would not have booted. But as you say it runs fine except for the noise, it is most likely the fan.\015\012And as the American saying goes, "Dont fix a thing unless it is broke", please carry on.\015\012
\015\012Happy Holidays
Repair Help & Product Troubleshooting for HP Pavilion dv4000 Notebook

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