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Laptop screen backlight not working - Computers & Internet

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If you can hold a flashlight to the screen and see your desktop, your backlight has burned out. You need to contact the manufacturer for a replacement.

Posted on May 07, 2008

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Look at the screen closely, if you cansee the image but only very faintly, there is a possibility it is your backlight because the laptop is probably older than 3 years, then you have to replace the ccfl bulb of the screen. It is a difficult repair but it can be done, if you look for guides online you will find something. I work for company that does Laptop repair in NYC and we do this repair frequently. You can get exact ccfl lamp for your screen type on ebay, it's all about the right length of the bulb.

Posted on May 19, 2009

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Brightness buttons (f2 and f3 are not working


Not a lot to go on here, Prabhdeep

Need the full model information

Example,
Acer Aspire 5535-5050

Post back in a Comment, or Reply; at end of this solution

Primer:

An LCD screen does not produce light,

http://solutions.3m.com/wps/portal/3M/en_US/NA_Optical/Systems/BehindTheScenes/Optics101/

Click on the monitor icon

Because of this the LCD screen needs an additional light source.
A Backlight is the additional light source.

A Backlight can be a CCFL, (Or more than one), or a series of LED's.
(Light Emitting Diode)

CCFL = Cold Cathode Fluorescent Lamp (Bulb)
Similar to Fluorescent lighting used in homes, and businesses; but on a MUCH smaller scale.
Average thickness is 2mm, or a little more than 1/16th of an Inch.
Or about the width of this capital letter -> O <-
Average length is almost as long, as the LCD screen is in height.

http://www.laptoprepair101.com/laptop/2007/12/09/replace-laptop-backlight-ccfl-lamp/

View the last 8 photos

(Do they break easily when trying to remove, and replace?
OH, YES!)

A screen Inverter is used to convert the power from the laptop, for the LCD screen, and Backlight.
If the laptop uses LED backlighting, it MAY or MAY NOT use a screen Inverter.
Generalized thinking (Can also be stated as 'Rule of Thumb'), is that if the laptop uses LED backlighting, it does NOT use a screen Inverter.

I also feel into this line of thinking, since none of the LED back-lit laptops seemed to use a screen Inverter; that came to the shop.
I have found this to be a fallacy from on here,......FixYa.....
I have looked up two laptops using LED backlighting, and discovered they also used a screen Inverter.

Now I post LED backlighting may, or may not use a screen Inverter.
Seems when LED backlighting first came out, a screen Inverter was used on some models.
Also seems as the LED backlighting technology progressed, no screen Inverter is used.

90 PERCENT of the time, the fault for bad Backlighting can be attributed to a bad screen Inverter.
Of course, this IS IF the laptop uses a screen Inverter.

For a laptop with LED backlighting that does not use a screen Inverter, and backlighting is bad (Dim, or non-existant), the next hardware part in the diagnoses to replace, is the LCD screen.

I now await the information I asked for above.
Then we can diagnose together.

Regards,
joecoolvette

May 09, 2013 | Computers & Internet

1 Answer

Monitor is dark. how to fix?


Walt, hold the Fn key down again, and tap once more on the Acer, F5, Display Toggle-Over key.

There are at least 3 display options available;

1) Internal display of laptop ONLY

2) Internal display of laptop AND external display

3) External display ONLY.

Were you just using the external display for more 'display real estate room', or was/is there a problem with the internal display of the laptop?

Was no problem? Is now? Even when using the guidance stated above for the Fn and F5 key?

Then if your laptop uses a CCFL for a Backlight, it also uses a screen Inverter. Screen Inverter is bad.

If it doesn't use CCFL/s for a backlight, and uses LED backlighting, replace the LCD screen.
The LED backlighting is incorporated in the LCD screen assembly, and you ain't replacing it.
Replace the entire LCD screen.

Post the laptop manufacturer name, and model number in a Comment. Model number is on Bottom of laptop.


Try to hurry as I'm going to a meeting with the head of General Motors, (Obama), and later with Bill Gates.





OH I'M JUST KIDDING!



Regards,
joecoolvette

Nov 14, 2012 | Computers & Internet

2 Answers

My laptop screen went black every thing is working but i cant see anything what might be the problem


hold the unit slihtly to a light if you can see the icons dimly on the screen then your screen has gone into freeze mode if you cant see the icons then your screen is probly blown to reset the screen from frozen it needs to be un plugged from the motherboard and plugged back in the plug is located under the panal above the keys

best luck

Oct 14, 2010 | Computers & Internet

1 Answer

Toshiba L300 screen flickers and backlight


Maybe is the backlight power cable cut. Try with the laptop in power on mode oppening VERY SLOWLY the screen to see if at a certain potition it works fine. Open it all the way up sometimes to check it. If thre is a potition that it works, it's the cable as I mentioned.

Stelios

Feb 20, 2010 | Toshiba Satellite Pro L300 Notebook

1 Answer

Acer aspirw 5100 brightness


1.The Function key (Fn), and the F6 key are pressed to turn the Backlight off to conserve power.

2.The Fn key and the right side arrow key, are pressed to increase Brightness.

You have a TFT LCD monitor screen. (Thin Film Transistor)
The LCD screen cannot be seen clearly without a Backlight.

The Backlight is a CCFL. Cold Cathode Fluorescent
tube. Resembles a small fluorescent tube used in residential, and commercial lighting.

The Backlight can go bad after time, and weaken.
If so, it will have to be replaced.

Sounds easy, it isn't.

The TFT LCD monitor screen is made up of layers. It's enclosed in a thin metal frame. Resembles a picture frame.

The frame is removed, after removing the LCD screen from the laptop's top cover.

The LCD screen transparent outside layers, are separated partially from the rest of the LCD screen.
The Backlight is removed out of the side.

This gives you an example of removing, and replacing an average Backlight,

http://www.laptoprepair101.com/laptop/2007/12/09/replace-laptop-backlight-ccfl-lamp/

Recommended job for a pro.

Dec 28, 2009 | Acer Aspire 5100 Notebook

1 Answer

Toshiba P10 laptop screen no longer works.


It's not the inverter but the biotin backlight bulb that lights the display from underneath. The screen needs to be replaced unless you want to try and rebuild it and replace the backlight bulb. New screens from EBay should not be more than 70-100 bucks. If you want to try and replace the backlight bulb, the link is below for the procedure.....

http://www.laptoprepair101.com/laptop/2007/12/09/replace-laptop-backlight-ccfl-lamp/

Nov 03, 2009 | Toshiba Satellite LP154W01 Notebook

1 Answer

Evesham 8640 Laptop Screen Failure


Most likely the backlight has failed however replacing the backlight is impractical and the screen should be replaced.

Jun 23, 2008 | Computers & Internet

1 Answer

No backlighting


You need to repalce the backlight/Screen altogether, or have someone do it for you. If the backlight has cracked then no amount of reconnecting will get it to work. Try one of the many Laptop repairers online to get a quote

Dec 28, 2006 | Toshiba Satellite M35X-S163 Notebook

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