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daniel hutchinson Posted on Dec 09, 2006
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Backlighting in my laptop screen dying/shorting out!

I've run into an odd problem. The backlighting on my Gateway MX7515 dies out after a few seconds once turned on. If I close the cover and re-open it, it'll sometimes turn on, but only lasts for about a second or so before it goes back out. I can still see the screen if I shine extra light onto it, and the computer runs fine aside from that. The thing is, when I leave my laptop unplugged and just running on battery, the screen has no trouble staying on, although it is just slightly dimmer than when the battery would normally be plugged in. But when I plug in the charger and try to use it when the charger's plugged in, the screen goes to its normal brightness but after about 3-4 seconds, the backlight dies out. I don't see why keeping it plugged in would make the backlight die out, but the cpu still charges normally and runs off the external power. Thank you in advance for your help.

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  • Expert 53 Answers
  • Posted on Apr 23, 2007
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Backlight needs replacing, can be done

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An LCD screen does not produce light,

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.

View the last 8 photos

(Do they break easily when trying to remove, and replace?

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.


Hp laptop dark screen(no ccf backlighting)

I recently worked on a Hp laptop with no bakclighting. Everything is on the screen except you cant see them because the backlighting do not work. First I thought it was the circuit driver.Then came to findout it was part of the motherboard that controls the backlighting circuit. The customer told me the laptop was overheated because he had left it on a soft surface and the vent was blocked. I had replaced a few small components on the motherboard andgot it to work. They are extremely small so it would require jewelers magnifying glass or a microscope.
on Jul 22, 2010 • Computers & Internet

My screen turns black and after few seconds it turns to normal and says

You could have a loose connection to the backlighting. drivers issue . Has the laptop been droped ,jarred, etc?

I've had my compaq presario cq61 for about 2-3 years. A while back it would occasionally have a kind of shaky/blinky screen but just in the past week it's like the screen has stopped working.

The problem may be due the graphics card or data cable or backlighting.

The data cable can be severed over time though opening and closing the display. This can be replaced.
The backlighting/inverter dies, some-times the windows desktop screen can be seen if one looks carefully. This can also be replaced.

Try connect your notebook to another computer's monitor via VGA or HDMI out.

If this works then the problem lies with your LCD screen.

Take care!

My laptop screen is not showing but upon using another screen its showing enter password

You do not how old your machine is....there are two situations that are most likely to cause your issue, both deal with the backlighting of the LCD.
The first, and most simple, is the little switch that sticks up in the back area of the laptop near the hinge. This switch closes and turns off the backlighting when you close the lid of the laptop. If this switch sticks or breaks it can cause this problem. Look very carefully at the "blank" LCD. If you can see what looks like shadows of the actual display there, then the display is on the LCD, but the backlighting needed to see it not present. The second issue is an age issue, The backlighting source (on older machine a fluorescent lamp) may have failed. If this is the case, repair or replace the machine.

Screen goes dead after few seconds. Green light stays on. If I disconnect from pc it shows "signal lost"

You need to try another screen if it is possible. Sounds like the screen you are using is about ready to die. I had one that would do something similar to that. The backlighting on the monitor went bad. Would come on for a few seconds and then go dark. You could just about make out the pictures but could not read the words at all. Had to get a replacement.

Trying another screen first will tell you if it is really the screen or video card.

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The backlighting on the display has failed - you will need to dismantle the lid and locate the origin of the problem - most likely the invertors or their power cables have died and they will have to be replaced.

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