Question about HP Compaq Business Notebook NX9005 Notebook

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Backlight no longer working...

Looks like I need a new LCD inverter. How easy is it to get hold of one and how easy is it to install a new one?

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Try this place:, it is dead easy to fit the lights and invertor but it aint cheap

Posted on May 24, 2008

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Toughbook is on but screen is black

Ok that means your lcd inverter has went bad or the backlight ,,but usally the lcd inverter,,can find both on ebay,,cheap uaslly,, but the inverter probly your problem ,,definetly would start there,,easiest fix,,find you a lcd inverter,,,,ebay or internet,,when u get it,,take bezel off lcd ,,the front cover with screw driver,,be easy ,,take ur time ,,once off ,,in the middle of lcd @ bottom theres lcd inverter for new one ,,turn on and check b4 u put bezel back ,,on,,should be good to go,,if that doesnt fix,,backlight bad,,easy to find also,,goodluck,,

Nov 20, 2010 | Panasonic Toughbook 28 Notebook

1 Answer

My screen is totally blank. how can i diagnose what's wrong?

A) Suggest you start with seeing if graphics are being shown, but not displaying on the LCD screen.

May be an Inverter problem.

1) Laptop on, use a flashlight, and shine it at the LCD screen. Shine the flashlight at an angle.

Do you see faint images?

2) Laptop off, plug in a VGA monitor to the VGA connector on the back of the laptop. Turn the VGA monitor on, and turn the laptop on. (Do NOT have the laptop running, and plug the monitor into it)

This is what a VGA connector looks like,

(Photo to the right. The VGA monitor cable's connector is shown to the Left)

Press the Fn key, hold it down, and press the key that toggles over the graphics to an external monitor. The key will have a monitor icon symbol on it. (Empty rectangle)

Do you have graphics on the External monitor?

1) expounded on:

An LCD screen cannot produce enough light by itself.
For this reason an additional light source is provided.

A Backlight is the additional light source.

A Backlight is a CCFL.
Cold Cathode Fluorescent Lamp. (Lamp = Bulb)
Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.

An Inverter is used to provide power for the LCD screen, and the Backlight.

The laptop's power is not enough to power the LCD screen, so the power is increased for the LCD screen by the Inverter.

The power from the laptop is too much for a Backlight, so the power is decreased for the Backlight by the Inverter.

90 percent of the time the problem is the Inverter, not the Backlight.
An Inverter is a small circuit board located within the Display Assembly.

The Display Assembly consists of;
1) The top panel of the laptop that you see with the laptop closed.

2) The LCD screen (Assembly. More on that in a minute)

3) The Bezel. The thin frame in front of the LCD screen, that surrounds the LCD screen. Looks like a 'Picture Frame'

4) The metal frame that holds the LCD assembly together, and it's screws.

5) The brackets that are screwed to the LCD assembly frame, and then the brackets are screwed to the top panel.

6) The Inverter. A small circuit board, (Usually as long as your longest finger, and about the same width), located BEHIND the Bezel, and at the bottom of the LCD screen

7) Wireless Antenna

8) Backlight. Description already provided. The Backlight is inside the metal frame that surrounds the LCD assembly. On one edge. (Sometimes more than one Backlight is used)

The LCD screen is an assembly. What you see on the outside is a protective screen.

If I may;

This is an example of an Inverter for an Everex Stepnote VA4300M,

I await your findings. Post in a Comment.

Nov 20, 2010 | Everex StepNote VA4300M Notebook PC

1 Answer

Why would my HP laptop screen go black?

A few reasons
1) backlight burnt out (or broken)
2) loose or broken cable AND backlight burnt out (or broken)
3) Failed GPU (probably integrated into the motherboard on that model)
4) failed motherboard (same issue above)

Check by plugging in an external monitor- if you get a signal, your LCD need a new backlight (or inverter, an easy fix under $15 USD)).

Cheapest solution is to simply replace the backlight, but you'll have to diassemble the entire laptop lid/cover AND the LCD to get to the backlight at the bottom. (this could be under $20 USD to do). Often similar sized LCD's with different part numbers will work fine in different laptops (meaning, a 14" LCD mady by samsung or LG will be compatible with almost any same 14" LCD made by either, especially if it comes WITH the inverter!)...


Sep 04, 2010 | HP Pavilion dv2000t Notebook

2 Answers

It looks like the bulb in the screen is burnt out. The screen is completely dark when fully chared.

You can determine if the bulb is bad by simply connect a monitor to the fifteen pin AGP port located at the side of your computer usually color blue. If your computer display the desktop on the monitor,you should change the bulb in your computer display.To change the backlight you need to follow these steps :Power off your Toshiba laptop and make sure the AC adapter is unplugged.
Remove the screws on the side of your laptop screen. Once the screws are removed, you can remove the plastic bezel (screen guard).
Pop the bezel out, exposing all of the LCD screen. Pull the LCD screen gently away from the computer by the corner. Be mindful that the screen is still connected to the computer by a ribbon cable.
Remove the tape over the ribbon cable where it connects to the screen, and gently pull the cable to disconnect it.
Turn the LCD face down, and remove the piece of tape that holds the top metallic foil against the back of the LCD.
Lift the metallic foil to expose the backlight. Remove the single screw at the end of it that holds it in place. Unclip the wire at the end of the backlight from the inverter (power source to the backlight), and remove it from the LCD. Replace it with the new backlight (available at any electronics store or online), and reassemble the device the same way you took it apart.

Aug 30, 2010 | Toshiba Satellite A105 Notebook

2 Answers

Toshiba P105, backlight dont turn on in my lap

If the LCD, inverter etc works in anothe laptop but not in the original laptop then it looks like a motherboard problem, possibly the power supply to the inverter.

Oct 11, 2009 | Toshiba Satellite P105-S921 Laptop PC...

2 Answers

I have a Dell laptop D505. The laptop powers up but the screen display is very dim. I can't see the image on the monitor. I've tried to manually increase the color/brightness button and nothing changes. ...

Sounds like your inverter or your backlight is failing. The inverter is an easy repair, the backlight can be replaced but it involves taking the LCD panel apart, The backlight comes installed on new screens. I can include a service manual below and possibly a generic guide to backlight replacement....

Sep 23, 2009 | Dell Latitude D505 Notebook

2 Answers

Black screen on acer 242lc lights come on power up

You may have a defective CCFL backlight, it may have the following symptom: Screen flashs on red/pink and off. Picture stays on in red and slowly be come normal. Picture flickering with dim display or appear black. Picture flickering on and off. All these symptoms indicate that the LCD backlight lamp (CCFL Lamp) has reached the end of the life and all you need to do is replacing the CCFL lamp.
Connect an external monitor to your laptop and power the monitor up first then the laptop, if you see the normal Windows images then the video card and laptop is OK and the problem is definitely the backlight. Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight and it could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out or burnt out, most likely this is the case.
The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills.
Check out LCD Parts for service, parts, and DIY info Use this link to their WEB site :-

Sep 18, 2009 | Acer TravelMate 242LC Notebook

3 Answers

Dell Inspiron 6000 Laptop Screen has Faint Image

It's a faulty backlight (screen).
Replace screen (same dell part number) with inverter, otherwise screen can be dark.
Here is how Dell part number looks (green):

Aug 19, 2009 | Dell Inspiron 6000 Notebook

2 Answers

Backlight failure HP DV1010

You need a new screen or inverter, depending on the problem. You can't replace the backlight itself because it is build into the LCD panel. Using a mercury reaction, it makes light. Because of the mercury, it is also dangerous to replace.

Jun 25, 2009 | HP Pavilion DV1010 Notebook

1 Answer

Monitor screen is very dim.

you must replace your lcd inverter, you can obtain one for around 5-15 usd, you will need to open your lcd bezel(plastics)this it a common problem in this model, its easy just be carefull with your lcd. The inverter it is located under lcd, you need to remove the frontal plastic, locate the inverter and replace it. The dark it is because your inverter no longer turn on your backlight(a lamp to give brightness to your lcd inside your lcd)
This could be a hard work if you didnt have the tools or experience.

If you wish we can replace your inverter for $49 usd
10001 buckwood ave 79925 El Paso Tx.
Contac us if you are interested
Thanks, please leave feedback

Apr 22, 2009 | HP Compaq Presario R4000 Notebook

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