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Backlight screen is black however you can very faintly see the desktop. if i hit function F11, for just a second, the the screen will light up in a red tinted color. i wonder if this is something i can repair myself. thanx guys!veronica

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Re: backlight

You my friend have a blown backlight! These things are repairable, but costly. Companies will tell you that, they will talk you into another PC! My suggestions is search online for a vendor that sells backlights for LCDs. This will resolve the issue!

Posted on Nov 26, 2007

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R15d notebook screen black, fans running

either your backlight has failed or you have hit one of the function keys which selects external monitor- can you connect it to an external monitor to see what happens?

May 21, 2014 | Microsoft PC Laptops

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I have lenovo screen flickers in every 5minutes...

Failing Inverter An inverter, typically found inside a laptop computer, consists of a small board, which has impregnated electronic circuits stamped on it. Inverters look like thin boards about the of two sticks of chewing gum. The inverter and its bulb control the intensity of the liquid crystal display, which lights the screen monitor. The computer can control the output voltage of the inverter and either lighten or darken the screen. A special type of inverter can adjust the brightness of the screen by using an internal sensor to judge the room brightness, and then adjust the screen accordingly. Failing inverters give off some specific warning signs, which can be recognized by observing different screen characteristics.

Short Intermittent Display Upon turning on the laptop, the screen flashes on in the normal mode for a short period and then blinks to black. A very faint image appears in a dark background, which will be very hard to see almost invisible. After shutting off the laptop and restarting, the same mode occurs, where the screen appears normal for a few seconds then fades to black. This condition points to a failed inverter. To confirm this, plug in an operational external monitor; if the external monitor functions, the inverter has failed. b> Total Blackout with Ghost image b> The laptop turns on, as indicated by the power supply button, but the screen comes up black. The screen comes up black after restart. You might be able to detect a very dim or ghost-like image on the monitor. When you plug in a known functioning external monitor, the external monitor operates normally. This mode of display indicates a failed inverter. b> Long Term Periodic Operation b> With this failure mode, the laptop screen illuminates normally upon start-up and remains that way after several minutes, hours or even days, until it goes very dark again. Brightness controls or restoration attempts do not work. Most often, the screen will function normally with a computer restart, but will eventually return to black. Faint ghost images might appear, as seen in the total blackout mode. b> Dark With Color Variation b> Upon computer start-up, the monitor shows black or dark gray, accompanied by very faint images. The screen might have an intermittent color change, or remain on with a non-standard color variation, like pink or red. b> Auto Control Switch b> If the screen appears black, with no faint or ghost images, look for the lid switch near the back hinge. The switch, when depressed with a closed lid, shuts off the computer and monitor functions. Sometimes the switch becomes stuck in the closed position, disallowing the computer and monitor to turn on when opened. Pushing the switch manually several times can often free it up. If the switch tab has broken or jammed inside the case, it needs replacing. b> Loose Connection In this mode, the display looks normal upon start-up, but tapping the side case of the computer turns the screen black. More tapping results in the screen functioning normally then cutting out again. This condition points to a loose wire connection from the inverter to the LCD backlight lamp, or the video cable. The connectors can be accessed by removing the monitor bezel screws and pulling the plastic retainer off. Both connectors can be cleaned and refitted.

Feb 10, 2013 | Lenovo G550 PC Notebook

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Black screen w/ faint image

It sounds like the inverter to me.

Shine a flashlight on the dark screen to see if you barelysee the icons on the desktop. If so, then the LCD Inverter is bad.

Plug in an external monitor and see if the display shows up on it. It can beany kind of monitor even the old big fat crt monitors as long as it has a vgacable to connect to your computer's vga port. If so that proves yourvideo card is ok. The video will show on most systems when you rebootwithout you having to do anything. Some systems will require you to hit the FN(Function key) + F1 thru F12. Hold down the FN key then hit the correctkey for displaying on the monitor (F1 thru F12). The correct key willnormally have CRT/LCD on it or it will have the icon of a display.

If you see no icons by shinning a flash light and the external monitor works,then your screen is bad. If you see no icons by shinning the flash lightand nothing shows on the external monitor, then most likely your video card isbad.

Mar 31, 2012 | PC Laptops

1 Answer

My samsung r20 backlight keeps going off, if i press the Fn and F5 button it comes on for a second and then back off

If you can see the images on the screen very faintly when you shine a flashlight on the screen, then your problem more than likely is the LCD Inverter. The LCD Inverter costs less than $10, but you will have to disassemble the lcd screen to get to it.

I'm sure you know that you can attach an external monitor to your laptop and hit the FN key and hold it while you hit the correct F1 thru F8 key that will display the image on the external monitor? This could be a solution until you get the inverter fixed.

Now a dishonest repairman will take advantage of you if you take that laptop to them talking about the backlight is going bad. He'll simply bill you $300 and tell you he had to replace the LCD Screen which houses the back light an most times it's easier to replace the screen then fool with the backlight. And in your case all he would do is replace the lcd inverter that sits under the lcd screen and is covered by the strip at the bottom that goes around the lcd screen.

Mar 20, 2012 | PC Laptops

1 Answer

Hp pavilionn dv6700 screen goes black after a while

If you shine a flashlight on your black screen and look real hard for the icons on the desktop. If you can faintly see them that means your LCD Inverter is bad. You'll have to disassemble the LCD Screen to get to it. In the mean time you can attach another monitor (LCD Flat Screen or the Old style fat CRT) with a VGA cable to the vga port on you laptop. Once you have it connected hit the FN (Function Key) + (F1 thru F12) key that that corresponds to the external display. Hold the FN Key while you hit the Function Key that is for the external display. The key might have the words LCD/CRT on it or it might show a display symbol. That's the key you want to hit while holding down the FN key. This will cause the desktop to display on the external monitor and verify that there is no problem with your Video Card inside the laptop.

Mar 15, 2012 | PC Laptops

1 Answer

My Sony VAIO Laptop screen is black. It worked fine, no issues2 days ago. Went to turn it on last night and it is black.. When light hits at a certain angle, I can see the desktop, I can hear the startup...

A faint and barely visible image on the screen indicates that the backlight(s) that illuminates the display isn't powering on. A device called an inverter board takes DC power from the laptop motherboard and converts it to AC power to power the screen backlight.
Before attempting anything below, be sure and remove the laptop battery and unplug the laptop
You need to take the screen apart and check to make sure that no cables are loose that are connected to the inverter board. If everything is secure, the next thing I would do is try to test the inverter board by hooking up an LCD from another laptop to the inverter and turning the laptop on to see if it lights up. If the other screen does light up, then the inverter board is likely good and your backlight needs to be replaced. Backlight replacement, unfortunately, can be very tricky for even an experienced technician, and many will opt to just replace the entire screen.
If you can't test the inverter board, then it might be worth it to order one and see if installing it fixes the problem.
Youtube is a great place to check for instructional videos on laptop repair, such as this one:
Good luck!

Sep 21, 2011 | Sony PC Laptops

1 Answer

Dell Inspiron 2200 boots up but 1-2 min in the screen goes to a faint black. You can still see the desktop and everything just very faintly. Like a fain transparent black.

Check with your Power Plan or screen saver option, you might have it adjusted to super energy saving to make your battery last longer and have the screen dim, or backlight shut off since you mention it take 1-2 min to boot up ...see if that might help.... If that didn't do the job, I suspect your backlit lighting might be going bad. Let me know what Operating system you are using too. So like I said, check your screen save and if it is set to dim, or shurt off withing a minute or two... set it to something longer to see if that works.

Jan 15, 2011 | Dell Inspiron 2200 Notebook

1 Answer

My hp notebook have a black screen,i treid everything their is

I am assuming that the computer starts. If you have a black screen it could mean the display is bad or the video card is bad or the backlight is out.
Can you get a display using an external monitor? (Remember to switch output using the Fn and special function key combo.) If so, then suspect the LCD screen. If you can see the display but very faintly, then it's the flourescent backlight.
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Jan 02, 2011 | HP PC Laptops

1 Answer

Dead compaq laptop, no boot activity

Larnold..Sounding like you need to check the LCD Power Inverter Circuit board.. this is located inside the screen a long rectangular circuit board that sends power to the screen backlight & Display Panel.. Could also be a Bad Backlight.. Try Booting it.. Hold it up to a light and look closely at the screen.. If you see a faint image but no light, it is the Backlight, if Just Black No Activity then its most likely the Power Inverter, OR a Bad Video Card.. You can test the VIDEO by Connecting the laptop to a Computer Monitor or similar with the laptops VGA Serial port.. then Use your function Key and Switch to 2nd Display.....(one of your F keys.. ).. If it Shows up on another screen, Its a Display problem and not the video card... Hope This Helps alittle.. Cheers

Jun 02, 2008 | HP Compaq Presario V6000T Notebook

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