Question about Acer Aspire 4520-5141 Notebook

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I have an Acer Aspire 5534 series backlight issue. I replaced a broken LCD and the new one worked for a month and then the backlight stopped working. We replaced it and the new one does not light up. Any suggestions. I do believe that this is a LED backlight not CCFL. Thanks... Dale

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  • Dale Barrett
    Dale Barrett May 26, 2011

    Was a problem with the cable at the motherboard end.

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The problem might be a defective inverter board rather than a bad backlight lamp.
Please refer to the following article for a detailed diagnosis procedure of the problem:
http://www.fixya.com/support/r6430776-troubleshooting_laptop_power_failures

Posted on May 26, 2011

  • Dale Barrett
    Dale Barrett May 26, 2011

    This is a new screen with new inverter. 2nd one. But thanks... I know about inverters and would love for this to have been the problem. Im going to check the connections on the cable at the mainboard end next.

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SOURCE: I have an Acer Aspire 5534 series backlight issue.

The problem might be a defective inverter board rather than a bad backlight lamp.
Please refer to the following article for a detailed diagnosis of the problem:
http://www.fixya.com/support/r6430776-troubleshooting_laptop_power_failures

Posted on May 26, 2011

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Back light sometimes works


If your laptop appears to boot up and the hard disk LED flashes, then the problem is probably a back light fault. This can be a faulty inverter or a faulty CCFL lamp. Please click on this link and follow my instructions to identify the fault and possible fix :- http://www.fixya.com/support/r3598095-faulty_laptop_lcd_screen

Nov 10, 2012 | Acer Aspire As5250-0327 320gb - Perfect...

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


kezler_0007,

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.

!O_O!?

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,

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

(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,

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

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)

1) http://www.screenaid.com/acer-aspire-43152004-laptop-lcd-screen-141-wxga-glossy-ccfl-backlight-p-7495.html

2) http://battery-adapter.com/product_info.php/products_id/3773/vAspire+4315+Series

3) http://www.tim.id.au/blog/tims-laptop-service-manuals/#toc-acer

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,

http://www.insidemylaptop.com/replace-broken-screen-acer-aspire-3810t-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?

http://www.fonerbooks.com/test.htm

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

For additional questions please post in a Comment.

Regards,
joecoolvette

Nov 03, 2012 | Acer Aspire 4315 Notebook

1 Answer

Screen has gone cloudy?


Kevin, Kevin, Kevin,.....you should have posted your problem here first.

Primer:
An LCD screen cannot produce light. It needs an additional light source.
A Backlight is the additional light source.

A Backlight can be a CCFL, or a series of LED lights.

In regards to the Acer Aspire 7720 series of Notebook PC's, the Backlight is a CCFL.

Cold Cathode Fluorescent Lamp.
Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.
(Approximately 2mm Wide, by close to the height of the LCD screen, Tall )

A screen Inverter is used to convert the power (Electricity) of the laptop, for the Backlight, and LCD screen.

http://www.cdsparts.com/p-97-new-acer-aspire-7720-7720g-7720z-7720zg-series-lcd-inverter.aspx

90 PERCENT OF THE TIME THE FAULT IS THE INVERTER.

The thin plastic frame in front of the LCD screen, (Resembles a picture frame), is the Display Bezel.

The screen Inverter is mounted towards the bottom of the LCD screen, and behind the Display Bezel.

This you already know. Posting for those who read this solution in the future.

Service Manual (Free),

http://www.tim.id.au/blog/tims-laptop-service-manuals/#toc-acer

For additional questions please post in a Comment.

Regards,
joecoolvette

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If the screen appears dark with only a faint image or picture and the brightness can't be adjusted then it is likely that the screen backlight is not on - the backlight is like a very thin flourescent tube that runs along the bottom of the screen and provides the illumination. The backlight tube may be faulty or the small electronic inverter unit that powers the backlight tube may have failed. Occasionally the backlight is off because the little switch that is used to detect the screen lid being closed is broken or stuck in. If your backlight is faulty, some engineers will replace it - but it is more common that the entire screen is changed. If it is the inverter they can usually be replaced from ebay.

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