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How to replace my backlight, for a compaq 2500

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Your laptop's LCD is illuminated by cold-cathode bulbs, often times a specific size for fitting purposes within your laptop's screen (as size constraints and cosmetic differences can leave little to no room withing the top lid for standard bulbs).

Replacing the back-light bulbs requires the original parts, or replacement as approved by the manufacturer. The first place I would start would be contacting HP (who now owns compaq) at 1-800-hpinvent and inquiring as to the cost for just a replacement screen for your model. Otherwise, you can order one from eBay or some other similar online resource.

The actual installation is quite simple, but it requires about 15-20 minutes of time, and three or four specific tools.

You have to disassemble the top lcd beveled casing, you have to detatch the lcd from the video flex cable that runs through the hinges of the unit and underneath the keyboard bevel. And re-attatch all said parts when you are complete. Keep track of the screws you remove in order to release the casing. And on the screen, often times those little rubber dots along the LCD screen actually need to be removed to locate several more screws.

That solution is if you purchase the entire LCD replacement contained together, which can be considerably more expensive than just replacing the back light. But finding the compatible parts to replace your LCD's defective ones might be close to impossible.

A quick search to help explain the process of replacing the cathode bulbs brought up this website via google:

http://www.inventgeek.com/Projects/shorts/overview.aspx

It has pictures that help illustrate the process for a standard screen. You would modify the instructions for your laptop's LCD screen.

If you do purchase a replacement LCD kit, you can always bring it to a Geeksquad technician and request an estime, or shop around to find a certified repair center that will install it for you.

Hope that helps.

Posted on May 01, 2008

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HP Support > HP 450 Notebook PC > Manuals downlaod page >

http://h20000.www2.hp.com/bizsupport/TechSupport/DocumentIndex.jsp?contentType=SupportManual&lang=en&cc=us&docIndexId=64179&taskId=135&prodSeriesId=5224999

Scroll down to the subheading - User Guide
Click on the appropriate Windows operating system you are using,
Windows 7, or Windows 8.

Both User Guides are PDF files.
The computer you are using now has Adobe Reader on it, which uses PDF files.
Allow the PDF file to download all the way.

Then go to the Top Left corner, and hover your mouse cursor on it.
You will see > Toggle Sidebar < will briefly appear.
Left-click on Toggle Sidebar

There will now be two icons;
Show Thumbnails on the left, and Show Document Outline on the right.......
Click on > Show Document Outline.

Scroll down the list. Click on the subheading >
Using the action keys.
(The Action keys are the F keys at the top of the Keyboard.
F1 through F12)

Here we see you hold down on the Fn key, (Bottom of Keyboard, second key from Left); and AT THE SAME TIME, tap on the F3 key. The F3 key is the Increase Brightness key.

Does not work?
Then you have a problem with the Backlight, in the LCD screen.

A primer before I go on........

An LCD screen does not produce light. It needs an additional light source.
A Backlight is the additional light source.

A Backlight can be a CCFL, (Or more than one), or a series of LED's.
(Light Emitting Diode)

A CCFL is a Cold Cathode Fluorescent Lamp. (Bulb)
Similar to Fluorescent lighting used in homes, and businesses; but on a MUCH smaller scale.
Average thickness is 2mm. That is a little larger than 1/16th of an Inch.
Average length is almost as long, as the LCD screen is in height.

CCFL backlighting uses a Screen Inverter.
LED backlighting GENERALLY does not use a screen Inverter.
(First models with LED backlighting seemed to use a screen Inverter. Newer models do not)

Your HP 450 Notebook PC uses LED backlighting.
Here we can see an LCD screen replacement example,

https://www.laptopscreen.com/English/model/HP-Compaq/HP~3115m~E-450/

NOTE -> Backlight type: LED
It does NOT use a screen Inverter.
How do I know? I'm looking at the Service Manual right now.
(I use two monitor screens)

You can also look at the Service Manual. It's Free, and available in the Manuals download page where you started.

On the Manuals download page, scroll down to the subheading >
Service and maintenance information.
Click on the blue >
HP 450 Notebook PC and HP 455 Notebook PC - Maintenance and Service Guide (26 Apr 2013)

Page 31 - Display assembly subcomponents

The LED backlighting is built into the LCD screen.
To replace the backlight, you replace the LCD screen.
Need step by step guidance with this, please post back in a Comment.
IT'S EASY.

Hello from the USA.
Regards,
joecoolvette

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Or does the monitor go into stand-by mode.


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Tallon41

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Here is a link that shows how to R/R an LCD (general info)
http://www.laptoprepair101.com/laptop/category/lcd-screen-repair/

Here is a site where you can buy the LCD at a good cost:

http://www.smartmicrousa.com/

You may have to copy and paste the link into your browser.
If I could be of further assistance, let me know. If this helps or solves the issue, please rate it.
Thanks, Joe

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http://h20000.www2.hp.com/bizsupport/TechSupport/SupportTaskIndex.jsp?lang=en&cc=us&taskId=110&prodTypeId=321957&prodSeriesId=242213

If you need anything else, let me know.

Thank you,
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