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My screen is dark and i've changed the inverter and this has made no difference. I tried the screen brightness function. An external monitor attached works fine. There must be a switch that turns the screen off when you close the lid but I can't find it.

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Look at your key board and you should see a monitor simble.
Most of the time, you will need to push the function key and the ?? maybe F-4 key at the same time.

Posted on Oct 05, 2009

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I have lenovo g550...my 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

1 Answer

Screen is too dark


You'll have to be more specific. Can you increase the brightness by using the FN and special function keys?
If not, your florescent backlight may be bad.
Try attaching an external monitor to see if the video is OK.
Then you might change the backlight. This is not a job for someone uncomfortable with taking the computer apart.

May 24, 2010 | HP Compaq nc6230 Notebook

1 Answer

Screen has gone almost dark. I can just make out the initial sign on screen. i replaced the LCD and it made no difference. i replaced the power inverter and the issue remains the same. any thoughts?


Can you use an external monitor? If the external monitor works fine then it could be the lcd cable that is defective. You replaced the lcd and the inverter but not the cable? I would use an external monitor and try to go into the bios. In the last pages of the bios there is a place to increase the brightness for both on A/C and Battery. Notice where the bars are and increase the bars until all of them are lit. Save and exit the bios. You also can increase the brightness using the keyboard. Hit the Fn key and look for the button that has the brightness symbol on it. Press both to up the brightness. These are the things I can think of at the moment. Let me know how you make out. Phil pmgibs1@verizon.net

Feb 23, 2010 | Dell Latitude D430 Notebook

1 Answer

My hitachi 15.4 inch laptop monitor is not working, i can read and see everything but its very dark so what is the problem and how can i read it clearly?


Hi:
You should first try to increase the screen brightness by holding down your function key and hitting the screen brightness key. If you have tried that, borrow a computer monitor, and connect it up to the VGA output connector on your laptop. If you toggle to an external monitor, by holding the function key, then the monitor key, you should be able to tell if the video is bright on the external monitor. If it is ok, then your laptop has either a bad LCD inverter, or backlight bulb.

Nov 19, 2009 | Hitachi CML154XW (Beige) 15" LCD Monitor

2 Answers

Dell inspiron 5150 dark screen, faint image in background


If it showed a pinkish tint on the screen before it went out it could be the backlite. If you can see a faint screen when you turn the room lights out it chuld be the inverter. Inverters are cheap ... a used one for around $8 on ebay. Try that first. Make sure that you buy the EXACT model that is presently in your laptop.

Jan 14, 2009 | Dell Inspiron 5150 Notebook

1 Answer

Dark screen with dull image in background


You may need to check your desktop image for your monitor and change it to something lighter
The external monitor usually uses your computer's default and not ncessarily the one from your laptop monitor

Without taking it apart myself, it could be some wiring from the laptop to the screen


Dec 13, 2008 | Computers & Internet

2 Answers

Monitor too dark....


inverter board bad. this runs your lcd lamp(s) but is not in the screen.

Oct 02, 2008 | ViewSonic VA702b 17" LCD Monitor

1 Answer

Display is very dark


Dim screen is usually caused by a bad inverter board especially if you get video to external monitor. Usually cost $100-$200 depending on laptop.

Hope this helps!

Jun 11, 2008 | Toshiba Satellite M45-S331 Notebook

1 Answer

Monitor too dark....


Usually every laptop has the option of adjusting the screen brightness as you would want the screen to be pretty dim when running on battery to conserve battery life.
First thing to check would be just that.

Dec 11, 2007 | Apple Colorsync 850 Monitor

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