Question about HP Compaq nc6220 Notebook

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Dark laptop display

Can barly see the display. have replaced the screen with a brand new one and also the inverter board also with brand new one, item is mitac 8399, running xp.

Posted by conkclo on

  • conkclo Aug 23, 2007

    thks wil see if ones are available on bay site, if this dont work guess it could be totally wrecked.

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Peter Young

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Well if youve already replaced both of those items with ones you know work then the last thing you can do is replace the LCD Cable

Posted on Aug 23, 2007

  • Peter Young Aug 23, 2007

    If this doesnt work you can be pretty sure youve got a motherboard issue. Good luck

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The screen on the laptop has gone extrmely dim and the fn button with the brightness button will not work.


It sounds like your display backlight has gone out. This is usually because the inverter board in the display, which provides power for the lamp, has gone bad. Replacement inverters are available for most brands of laptops, and they aren't hard to change. Search for your specific brand and model and "replacement inverter" and you should find several sources for the part, and sites with details of how to change it.

Jul 17, 2011 | Acer Computers & Internet

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How to replace an inverter board in a laptop screen.


Your laptop has no display but when you hook up an external monitor the picture is fine on it. If this is true then more than likely you have a bad inverter board. They are available at http://www.impactcomputer.com . They are not that expensive. You could also have a bad LCD screen but my experience has been that most of the time the inverters go bad. One way to tell is to shine a bright light on the LCD screen. At the right angle you should be able to see what should be on it. If you see a display then you probably have a bad inverter board. That doesn't rule out a bad back light but on most new computers you have to replace the display to replace the backlight so it would be a mute issue since the cost would be as much as a new unit.

To replace the inverter board you will have to remove the bezel around the LCD screen. Usually the bezel has a few screws hidden under plastic dots or rubber cushions. Remove any you see and then pry the bezel off. The inverter board should be visible at the bottom of the screen and may be held in with two screws. Remove and replace the inverter, reassemble the unit and you should be back in business.

hardrocko

Thanks for using FixYa.

on Mar 07, 2010 | Computers & Internet

1 Answer

Laptop screen is very dim. There is a very faint image. The LCD screen is brand new so that's not the problem


Hello,

As per your description, it is probably your inverter which is faulty.

The inverter is an electrical device which 'lits' the LCD. Without the inverter and the bulbs it powers, the screen would be too faint to be seen correctly.

To test if the inverter is defective, just turn on your laptop in a dark space, then put a flashlight on the screen to see if you have a fainted display. If you can see something, it is the inverter which is defective and should be replaced.

If you are handy, you can also remove the screen cover to see if there is a neon like light which lits up behind the LCD. If you can see the light, it means that the inverter is just working fine and that the is with the LCD itself, but if there is no light coming from behind the LCD, then you need to replace the inverter.

jbertrand_ba.jpg
Picture of an inverter.

Replacing the inverter:

1. After removing the screen 'cover', locate a small circuit board (usually below the LCD). Unplug the electrical cables and replace.

Hope this posts helps you.

May 16, 2011 | Computers & Internet

1 Answer

My screen is black /blank even though I can here the windows programe boot up. How can I restore the screen, or is it a deeper problem? thanks. Martin


If you look very closely at your screen, maybe shine a flashlight (torch?) on it, you may be able to see the display very dimly. If this is true and Windows is up and running, the usual cause is a bad display inverter. The inverter provides power for the display's backlight, and without the light you can't see the display.

The inverter is a small circuit board usually found at the bottom of the display panel. It's not too difficult to replace in most models, and replacements are commonly available now for most brands. If you do a Web search for "replacement inverter" for your brand and model of laptop, you should find several sources. It's good to start with eBay where there are many stores. You can also find many videos showing how to open the display and replace the inverter for many computers.

It is also possible that the display has some other fault. The backlight itself may fail, or there might be something wrong on the system board. But a bad inverter is very common, and would be the best place to start.

Good luck on the repair and thanks for using Fixya! If this has helped, please take a moment to leave a thoughtful rating.

Oct 28, 2010 | Computers & Internet

1 Answer

My labtop when i switch the power button on it comes on but the screen is completley black, cant see anything?


If the computer starting up and Windows is running properly but the screen is black (or the desktop is barely visible if you look at the screen closely), the backlight inverter circuit is probably to blame. This provides power for the display's backlight, and without the light you can't see the display even though it is working properly.

Fortunately, replacing the inverter in most laptops is pretty easy. Replacement parts and how-to information for many brands and models can be found online. Just search for "replacement inverter" for your brand and model and you should find several sources. A good place to find vendors today is eBay.

Replacing the inverter typically involves only a few steps. You remove a few screws to open the display. The inverter is usually a small board at the bottom of the display, held in by a couple of screws. Unplug a couple of cables, take out the old board. Then put the new one, reassemble the display and you should be back in business.

On the other hand, if the power light comes on when you press the button but the computer isn't starting up to Windows, there's some other issue that needs to be fixed. Connect an external monitor to your computer to verify it's really starting up (unless you are hearing the normal startup sound through the speakers). If an external monitor shows everything else is good, replace the inverter. Otherwise you'll need to see why your computer isn't starting.

Good luck on a speedy repair. Thanks for using Fixya!

Oct 18, 2010 | Computers & Internet

1 Answer

Thinkpad T20 display is very, very dark (unreadable). Does the display need to be replaced ?


1. Test using an external monitor. If it works, then either the screen bulb or the inverter board might be defective.
2. Test the inverter. Easiest way to do it if you have a good screen with a good bulb. Connect the good screen to the inverter board & test it. If it lights up, then the inverter board is good. If it did not, then the inverter board is bad & needs to be replaced.
3. If the inverter board is good, then we are left with the possibility that the screen bulb is bad. To fix this, we will need to replace the LCD screen.

Oct 08, 2010 | IBM ThinkPad T20 2647 Notebook

1 Answer

Replaced cracked display screen with new one and screen is black. System works with external monitor. Is there any drivers that need installed?


1. Test using an external monitor. If it works, then either the screen bulb or the inverter board might be defective.
2. Test the inverter. Easiest way to do it if you have a good screen with a good bulb. Connect the good screen to the inverter board & test it. If it lights up, then the inverter board is good. If it did not, then the inverter board is bad & needs to be replaced.
3. If the inverter board is good, then we are left with the possibility that the screen bulb is bad. To fix this, we will need to replace the LCD screen.

Sep 26, 2010 | HP Compaq Presario CQ50-210US Notebook

1 Answer

Mitac 8060b screen is really dull can only just make out any detail on screen has anyone any information as to why,thank you


Try attaching an external monitor to the laptop & see if you could get any display on it. If this is successful, then you might have either a faulty LCD cable or screen inverter board.
The LCD cable transfers data signal from the motherboard & video card to the LCD screen. It also supplies high voltage DC power to the screen inverter board. The screen inverter board works as a power supply for the backlight lamp mounted inside the LCD screen. It converts low voltage DC power to high voltage AC power needed for the backlight lamp

Sep 12, 2010 | Mitac GETAC A 320 Notebook

1 Answer

Screen on my compact laptop went black and I can only turn it on but have nothing but black


If the laptop comes on normally otherwise and is booting to Windows (you hear the normal startup sounds), look closely at the display and see if you can make out a faint image. It often helps to shine a flashlight on the display.

If the display is faint but present, you probably have a bad inverter board in the display. The inverter provides power for the display's backlight, and without the light the display still works but you can't see it. Inverter boards are available for most brands, they're not usually very expensive, and changing one isn't too difficult. A Web search for your brand and model and "replacement inverter" should turn up several sources. There are also YouTube videos showing how to replace the inverter in many kinds of laptops.

It's also possible the backlight itself is bad. If so, replacing the display is usually preferable to trying to replace the light. The light is built into the display and it's very difficult to replace without damaging the part or the display in the process. The display can be expensive, though.

If you're not sure that the computer is working, try starting it with an external monitor connected. If there's no display then, there's something wrong with the system board that's preventing the machine from starting up. Get that fixed, and it will probably fix the display trouble as well.

Mar 10, 2010 | Computers & Internet

1 Answer

Mitac Laptop Model 8399. Turns on but nothing on screen.


Try re-setting your memory module(s). They are usually found in an underneath compartment held in by one screw.

Mar 11, 2009 | Computers & Internet

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