Question about Gateway MX7515 Notebook

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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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Re: Backlighting in my laptop screen dying/shorting out! - Gateway MX7515 Notebook PC Laptops

Backlight needs replacing, can be done

Posted on Apr 23, 2007

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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

Acer Aspire 5535-5050

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


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.


May 09, 2013 | PC Laptops


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 | PC Laptops

1 Answer

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?

Nov 10, 2012 | Dell Vostro 1014 Laptop Computer

1 Answer

My acer aspire 4315 lcd is faulty...i can see in it but its so dark


I have found in the 8 years of being online, and providing answers/solutions to people's computer problems; that coming across, and trying to explain the answer/solution, is the hardest thing to do.

It appears I have failed you

Let's try again;

1) Perusing the internet, I look at what LCD screens are offered, (Aspire 4315 series of Notebook PC's), and see what backlighting is offered.

I have seen LCD screen examples offered, that seem to be CCFL backlighting.
I DO have to know however, WHAT style of backlighting is used for YOUR laptop.

Do Not want to make a mistake here, because the mistake could cost you five times as much.

You buy a not needed LCD screen, about $100, and only needed a screen Inverter; about $18.


IF, your laptop states LED backlighting, THEN the only option is to buy the entire LCD screen.
With LED backlighting, the LED backlighting is incorporated into the LCD screen assembly.

There is no simply replace the LED backlighting.

With a laptop that uses CCFL for backlighting, the first thing to do is replace the screen Inverter.
90 PERCENT OF THE TIME the fault is a bad screen Inverter.

Allow me to state the primer over again, now that I have more room;

An LCD screen does Not produce light,

(Click on the monitor icon)

Therefore an LCD screen needs an additional light source.
A Backlight is the additional light source.

A Backlight can be a CCFL, (Or two of them), Or a series of LED's.
(Light Emitting Diode)

When I state series, I mean a LOT of LED's. They are incorporated into the LCD screen assembly.
(You see from the above link that an LCD screen is an assembly)

A CCFL is a Cold Cathode Fluorescent Lamp. (Bulb)
Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.

Average thickness is 2mm. That is a little larger than 1/16th of an Inch.
Average length is almost as long, as the LCD screen is in height,

View the last 8 photos to see what an average CCFL looks like.

Know this also; A CCFL is a Fluorescent bulb.
This means it has MERCURY in it.
VERY dangerous if the bulb breaks!
Mercury is POISON to the human body.

IF, it is determined that the laptop uses CCFL/s for a Backlight, -> AND the CCFL/s are bad, I implore you to have a pro change it/them.
The other option would be to replace the LCD screen.
The CCFL is incorporated into the LCD screen assembly.

HOWEVER, I still go with the screen Inverter is bad.
(IF, the laptop uses CCFL for a Backlight)




Go to the 'paragraph' that starts with Aspire 1200. (1200 in Blue)
Drop down to the 4th line, (3810T in blue), scroll across, and click on - 4315

This is a free Service Manual.
It is in PDF file form.
The computer you are using now has Adobe Reader on it, which uses PDF files.

After you click on the file name (4315) it may take up to 30 seconds, before the first page comes up.
(The file is downloading in the background)

[May be on my end, but it took 44 seconds just now, and using a medium speed DSL connection. Usually takes 10 to 12 seconds. Just letting you know so you do not think the link doesn't work ]

LCD Module Disassembly Process - Page 86

Hmmm, also states Inverter Board. (screen Inverter)

Removing the LCD Module is on Page 71.

4) NOT an Acer Aspire 4315 series of Notebook PC; Aspire 3810T. Posted so you would be able to get a more 'Hands on' idea, of working on your laptop,

Test the screen Inverter before replacing?
IF you have a sensitive multimeter, you can. Otherwise IMHO the choice is to just replace the screen Inverter.
Parts changing I know, and I abhor it; but if it is your only choice?

Where in the Philippines to order from? Do not know.
Suggest using the internet.

For additional questions please post in a Comment.


Nov 03, 2012 | Acer Aspire 4315 Notebook

1 Answer

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!

Sep 11, 2012 | HEWLETT-PACKARD Compaq Presario CQ61412NR...

1 Answer

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.

Jan 23, 2012 | PC Laptops

1 Answer

When i turn on my compaq presario cq61 it turns on but i can faintly see the screen and then i can see much at all help me

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.

Feb 18, 2011 | PC Laptops

1 Answer

Total freeze at random points When booting sonetimes b4 windows loads some times after 5 minutes of running normally but every time it is booted.

the hard drive could be failing .. is it a fresh install when your harddrive starts to fail it will F%%k up at different times on odd things

Dec 27, 2009 | Gateway MX7515 Notebook

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