Question about HP Pavilion zt1170 Notebook

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My laptop backlight needs to be replaced

My father had my laptop, used it about 30 times... and then dropped it. Since then, the backlight on the monitor barely works. It's mostly black, but sometimes, I can see a shadow of what is supposed to be on screen. He bought a new laptop and this one sat for over a year. He just gave it to me and now it's my problem. Is there any way I can change it myself? I'm very capable and look forward to any excuse to use a tool.
I have looked at the monitor casing and there is no obvious way to get in. Can I access what I need to replace by removing the battery and unscrewing there?

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First. you will need to disassemble the frame around, not easy, then you can access the screws holding in the screen. take them out, unplug the invertor, and screen cable. Flip the screen around and you will see a shiny foil looking paper plastic, to access the back light you will need to peel the foil back wear the light is. its easy to locate, then replace and back step.

Posted on Oct 02, 2008

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Posted on Jan 02, 2017

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1 Answer

Why did backlight stop working?


Sounds like the invertor supplying the back light or the backlight itself has failed.
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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,
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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

Only displays when powered up with screen at 30 degrees


Are you saying the backlighting isn't working? Or is it the on/off switch the controls the backlighting when the lid is closed or opened? Maybe tis will help: http://www.youtube.com/watch?v=2Yi6GNFcP3w Has it been dropped, jarred, bumped? Fell over? There is a ribbon cable in the rear of the monitor that can be loose.

Jan 12, 2013 | HP Pavilion dv9720us Notebook

1 Answer

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

Replacing CCFL Tube


I've repaired 1000+ Toshiba and replacing the FL tube is something I would never attempt to do because of how hard they make it to do. Generally there is a FL Inverter below the LCD that goes bad which causes the backlight not to light up correctly. The actual FL tube rarely breaks and unless you know you dropped the laptop it probably isn't what is wrong. 95% of the time when the backlight isn't lit up it is the FL inverter board.

Nov 13, 2009 | Toshiba Satellite A135 Notebook

1 Answer

Pink vertical line in acer aspire 4736z


You may have a defective CCFL backlight, it may have the following symptom: Screen flashs on red/pink and off. Picture stays on in red and slowly be come normal. Picture flickering with dim display or appear black. Picture flickering on and off. All these symptoms indicate that the LCD backlight lamp (CCFL Lamp) has reached the end of the life and all you need to do is replacing the CCFL lamp.
Connect an external monitor to your laptop and power the monitor up first then the laptop, if you see the normal Windows images then the video card and laptop is OK and the problem is definitely the backlight. Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight and it could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out or burnt out, most likely this is the case.
The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills.
Check out
www.lcdparts.net

Sep 09, 2009 | Compaq Presario M2000 Notebook

1 Answer

I dropped my laptop, white pixels turn pink


The CCFL lamp has been partially damaged and could fail completely any time. Defective CCFL backlight, it may have the following symptom: Screen flashs on red/pink and off. Picture stays on in red and slowly be come normal. Picture flickering with dim display or appear black. Picture flickering on and off. All these symptoms indicate that the LCD backlight lamp (CCFL Lamp) has reached the end of the life and all you need to do is replacing the CCFL lamp.
Connect an external monitor to your laptop and power the monitor up first then the laptop, if you see the normal Windows images then the video card and laptop is OK and the problem is definitely the backlight. Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight and it could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out or burnt out, most likely this is the case.
The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills.
Check out
www.lcdparts.net
for parts, repair service and DIY info.
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Jul 09, 2009 | Dell Latitude D600 Notebook

1 Answer

T20 batteries wont stay charged


It might be that you are using older batteries. However, you should try dimming your backlight to the lowest possible setting and performing any other power-saving actions such as limiting the processor's power (if available on your laptop.) Hope this helps.

May 09, 2009 | IBM ThinkPad T20 2647 Notebook

2 Answers

Cant get monitor to light up


your problem is a faulty ccfl BackLight Inverter, the display uses the backlight to illuminate the lcd screen, the inverter is used to illuminate the cold cathode light in the back of ther lcd theirs countless places to laern about it on google.
They are cheap to replace google your model with inverter at the end..
However you 1st need to make sure the new screen didnt come with an inverter. It should have if it did then you may have a motherboard issue.

Apr 09, 2009 | HP Pavilion dv8000t Notebook

2 Answers

My lcd backlight has burned out


There are four options. One is to replace the entire LCD Panel. Not cost effective but probably the easiest. Two is to replace the flourescent tube, but this requires unmounting the panel from the laptop, disassembling it, desoldering and soldering the old/new tubes, reassembly and remounting. The time and hassle is not worth the amount spent on a new LCD (besides, the flourescents are very fragile and break easily, plus they are made with lead so you must wear gloves for the replacement procedure). Three is that you can use an external monitor, so long as you have no reason to move the laptop. Fourth is buy a new machine.

I would probably look on eBay for a known good used panel or even a dead system on the same brand/model which has a good LCD and then change the panel myself. It is not that hard, especially if you find the right service manual.

But how do you know it is the backlight? It might also be a bad inverter. An inverter is about $30 where a new LCD would be $150 or more, and even a used one might run $75. Best to try to find a non-working used system with no video problems, or maybe even a complete replacement top on eBay so you have all the parts you might need.

Dec 30, 2008 | Compaq Presario M2000 Notebook

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