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Backlight turns off on dell 1721

On charge my backlight will turn off but in the light you can still see the screen is on. If i use computer on battery only this will not happen at all. When it does it all I have to do is close lid and reopen and it works fine again for 2 to 3 minutes and turns back off.

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  • Anonymous May 22, 2009

    I have same problem on vistro 1500.

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Seem like you have the bright very high, try dimming a little bit.

Posted on Apr 14, 2009

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1 Answer

The backlight won't turn on but occasionally will flicker.


Suggest you replace the Inverter. A Backlight goes out all at once.
90% of the time the Inverter is the hardware part at fault.

[ An LCD screen cannot produce enough light by itself.
A Backlight is used to supply the needed extra lighting.
A Backlight is a CCFL.
Cold Cathode Fluorescent Lamp.
Similar to Fluorescent lighting used in homes, and businesses, but on a much smaller scale

An Inverter is used to required power for the LCD screen, and the Backlight.
Boosts power up for the LCD screen, brings it down for the Backlight.

Dell Support > Latitude D600 Notebook PC > Service Manual

http://support.dell.com/support/edocs/systems/latd600/en/sm/index.htm

Replacing an Inverter is a simple job. Replacing a Backlight is not.
The Backlight is located within the LCD screen assembly.

The metal frame of the LCD screen assembly is removed along the edge where the Backlight is located, to access replacing the Backlight.

In the above list for Service Manual, click on > Display Assembly and Display Latch.

This information shows you where the Inverter is located on a Dell Latitude D620 Notebook PC.
The Latitude D620 is part of the Latitude D600 series of Notebook PC's.

http://www.insidemylaptop.com/remove-replace-lcd-screen-dell-latitude-d620-laptop/

Just one place from a quick search, that sells Inverters for a Latitude D600 series Notebook PC,

http://www.parts-people.com/index.php?action=item&id=2895

MATCH the part number listed that they have, to the part number on your Inverter.
You have to have THE correct Inverter.

Regards,
joecoolvette

Nov 05, 2010 | Dell Latitude D600 Notebook

1 Answer

I have a Dell inspiron 1721. The screen is dim ... when I try to adjust the brightness it won't adjust any brighter than it already is and makes some type of humming noise at the settings in the middle. ...


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 06, 2010 | Dell Inspiron 1721 Notebook

2 Answers

Hi my screen is black when I turn on my laptop.


ysounds like you either have to replace the backliught tubes and/or the circuit board that runs the backlight tubes.backlight tubes are available on ebay from a gentleman in oklahoma city oklahoma

Jun 23, 2010 | Dell Inspiron 710m Notebook

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Dell XPS M1330 Backlight Problems


Really does sound like a backlight problem. They usually don't cost much and are easy to replace if you are good with a screwdriver.

Apr 25, 2010 | Dell XPS M1330 Notebook

1 Answer

Camera turns on fine. I could view picture and all. Just that when I switch to camera mode a video screen is blacked out. Why is that?


Your have a "Display" button that toggles thru different display modes .. one of the modes turns off the LCD backlight .. that useful if you are in bright light and dont need the backlight .. you have a very nice "transflective" display that works great in bright light without the backlight ... you can get more shots with the backlight turned off on each battery charge .(about 25% more) .

so each time you operate the display mode button you will get a different display .. one shows a hystogram .. one turns off the backlight and one puts the camera in a normal mode ..

if everything is working right then even with the backlight turned off you should be able to go outside or any brightly lighted area and see the picture on the screen ..

Sep 04, 2009 | Sony Cyber-Shot DSC-T33 Digital Camera

1 Answer

My backlight has turned off on my dell 1721


Most probably your LCD works fine but backlight is not.
Send it to service for back light replacement / connection fix.

Jul 08, 2009 | Dell Inspiron 1721 17" Notebook PC, AMD...

3 Answers

My 3 year old Dell Inspiron 710m screen won't light up


to see if its your backlight, shine a torch onto the screen and if all is visible then, your backlight is out.
they are not expensive but getting someone to replace it may be.

Dec 20, 2008 | Dell Inspiron 710m Notebook

1 Answer

Dell e193FPc monitor


The backlight or inverter may be bad. With the monitor on and the room dark, hold a flashlight very close and shine it on the screen . If you can see the normal display the monitor is OK but the backlight or the inverter which provides proper voltage to the backlight has gone bad.

Nov 10, 2008 | Dell E193FP 19" Flat Panel LCD Monitor

1 Answer

Backlight of LCD turns off


Hi,
For latitude systems they have this ambient light sensor. it basically adjusts the brightness of the screen depening on room lighting. try to go to bios by hitting F2 on the dell logo. go to video and try to look for ambient light sensor. however, im not sure if your computer has that feature I have a second option for you though. based on the troubleshooting you've done, it seems that the video back lighting is affected by movement. it would be a good try to reseat the LCD cable. you can use this link to guide you in fixing the computer : http://support.dell.com/support/edocs/systems/latd505/sm/keyboard.htm
all you need to do is to take out the keyboard with 2 screw holding it in place. the LCD cable should then be accessible. it a thick cable that coming out of the Left hinge.

Hope this helps.

thanks.

Dec 24, 2007 | Dell Latitude D505 Notebook

1 Answer

Dell Latitude LCD screen is dark, but computer is still working.


It sounds like the backlight has burned out. The faint light you are seeing is ambient light in your room being reflected through the LCD. Try it in a perfectly dark room and see if you can see anything on the screen. The following page should give you a sense of what is involved in replacing a backlight: http://home.comcast.net/~stonent/screenfix.htm If you aren't comfortable taking things like this apart, I would recommend finding a local repair shop to replace the backlight.

Feb 15, 2007 | Dell E173FP 17" LCD Monitor

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