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How can i tell wether i need an led backlight replacement kit or a whole new led screen for my laptop?

Computer powers on and off but i have no screen on power up

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If you have HDMI access plug in and get a display on a tv. Then unplug HDMI plug. For a brief moment you should see an image on the laptop display. If you don't see anything at all, then its probably not your back light.

Posted on Feb 09, 2012

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Posted on Jan 02, 2017

Geekman
  • 32281 Answers

SOURCE: LCD Screen is black

It could be either, if you can get another LCD screen (same make/model) you can swap to ckeck it out.
You could check the inverter by touching its output and if you get a bit of an electrical shock then you know the inverter is working or check it with a multimeter if you don't like electric shocks.

Posted on Dec 28, 2008

  • 2567 Answers

SOURCE: My laptop will fire up and if plugged into a

Diagnosis:
1. Test using an external monitor. If it works, then either the screen bulb or the inverter board might be defective.
2. Test the inverter. Easiest way to do it if you have a good screen with a good bulb. Connect the good screen to the inverter board & test it. If it lights up, then the inverter board is good. If it did not, then the inverter board is bad & needs to be replaced.
3. If the inverter board is good, then we are left with the possibility that the screen bulb is bad. To fix this, we will need to replace the LCD screen.

Posted on Oct 06, 2010

leecom72
  • 4806 Answers

SOURCE: When buying a new LED laptop screen, do I have to

Hi.

No, the backlight comes already installed with the screen. The only other thing that that you may have to replace (and i doubt it) could be the LCD inverter, but that is not part of the screen but rather the part which provides power to the screen so it will light up.

you should be fine with just purchasing a new screen.





Regards.

Posted on Jun 02, 2011

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Screen is black


This website sells both replacement CCFL backlights and upgrate LED replacement backlights.

update ccfl lcd to led lcd led strip led backlight led kit led backlight...

Dec 04, 2013 | Northstar Explorer 657...

1 Answer

Why is my replaced lcd screen not lighting up?


1) Wrong LCD screen

2) Video Cable (LCD Cable) is not connected tightly.
Motherboard side, or LCD screen side; or both.

3) IF, a screen Inverter is used, the small cable from the Video Cable, that connects to the screen Inverter; is not connected, or has a loose connection to it. (screen Inverter)

4) An LCD screen, and a screen Inverter are a Matched unit.
If it's the wrong LCD screen......................?

5) IF, a screen Inverter is used; the diagnosis was wrong, and the LCD screen was replaced.
90 PERCENT of the time, the fault is a bad screen Inverter.

A) Laptop's LCD screen uses a CCFL, (Or more than one), for a Backlight; the laptop uses a screen Inverter.

Diagnostic flowchart leads from Graphics Chipset, to Video Cable, to screen Inverter, THEN, LCD screen.
Expensive LCD screen was replaced, instead of the actual part that needed replacing;
Video Cable: $9 to $22
Screen Inverter: $9 to $22

LCD screen: $60 to $245

B) Laptop's LCD screen uses LED backlighting, and does NOT use a screen Inverter:

Diagnostic flowchart is;
A) Video Cable;
A Video Cable should have it's connections PHYSICALLY checked.
You have to try to push the connectors in tighter.
Visual inspection alone will NOT do.

Making sure the Video Cable connections are tight, and this does not fix the problem, then the Video Cable needs to be removed; and every wire in the Video Cable checked for Continuity with a multimeter set to OHM's. (1K)

Not feasible, then take the Video Cable down to the nearest small computer shop; and have the resident tech check it for Continuity.
Should only be a few bucks.

Or just replace the Video Cable.
(Parts changing I know, but...........?)

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 more than one), or a series of LED's.
(Light Emitting Diode)

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 large than 1/16th of an Inch.
Average thickness is almost as long, as the LCD screen is in height.
View the last 8 photos,

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

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

As previously stated, Backlighting that uses CCFL, uses a screen Inverter.
LED backlighting MAY, or MAY NOT use a screen Inverter.
When the LED backlight technology first came out, it seems some did use a screen Inverter.
It also seems as the technology advanced, LED backlighting does Not use a screen Inverter.

Regards,
joecoolvette

May 14, 2013 | Sony Computers & Internet

1 Answer

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

I have a dark shadow on the bottom right corner of my new laptop


OK Mel, it's your dime.

The LCD screen is bad. It may be just the Backlight, but since you purchased this baby new; it will have LED backlighting. There is NO replacing the backlighting, there is ONLY replace the LCD screen.

Primer if I may;

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 image)

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)

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. (-> O <- approximate thickness)
Average length is almost as long, as the LCD screen is in height.

General example,

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

(View the last 8 photos)

Newer laptops like yours use a series of LED's.

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

LED backlighting does NOT use a screen Inverter.

When an LCD screen that uses LED backlighting, has problems with the backlighting, the entire LCD screen is replaced as a unit.

Is the problem with the LCD screen itself? Could be. The entire LCD screen is replaced. Either way, replace LCD screen.

Now,....the above is just GENERIC information.
I need the laptop manufacturer name, and model number. The model number may be on the Palm Rest Cover, to the right of the Touchpad.
It WILL be on the bottom of the laptop.
Post back in a Comment.

This way I can see if there is a link to give you for a free Service Manual, and perhaps some pictorial information also.
Then I will guide you step by step, and we'll get that LCD screen replaced.

It isn't hard at all, I assure you. YOU CAN do it.

Regards, joecoolvette


(Psst, they don't have them anymore because it was a special sale.
Whoever the laptop manufacturer is, though; is obligated to repair it. Kinda hard to get them to replace the entire laptop. DOES happen though.

Laptop was like that from the factory. Is not the consumer's problem, is the factory.

I don't care if it came from Best Buy, Tigerdirect, Newegg, or your uncle; the FACTORY is obligated to repair it. DOES NOT matter if it was a Black Friday sale, Christmas sale, or an Easter Egg hunt.

DO understand about the time frame thing, though. Plus DO commend you for your willingness to repair. It is people like you that built the world, not sat by and watched)

Nov 26, 2012 | Computers & Internet

1 Answer

I need a replacement screen and i'm not sure which cffl/backlight to order


Here are the eBay search results for your exact system model -

http://www.ebay.com/sch/i.html?_trksid=p5197.m570.l1313&_nkw=Toshiba+Satellite+L355D-S7809+screen&_sacat=0

Sep 20, 2012 | Toshiba Satellite L355D-S7809 NoteBook AMD...

1 Answer

Are the display bands compatible?


1) Toshiba Satellite P300-13j LCD screen example,

http://www.screentekinc.com/Toshiba_Satellite_P300D-13J--17-inch--1440x900-wxgaplus-laptop-lcd-screen.shtml

Thin Film Transistor (TFT) Active Matrix LCD screen, that is WXGA, and uses one CCFL for a Backlight.

2) http://www.lcds4less.com/ToshibaLaptop__Toshiba_Satellite_P300D-12L__laptop-screens.html

Thin Film Transistor (TFT) Active Matrix LCD screen, that is WXGA, and has 1 CCFL for a Backlight.

There is a pretty good chance. The screen Inverter and LCD screen are a matched unit. I would remove the screen Inverter from the P300-12L, and use it also.

Looks like this,

http://www.lcd-inverter-shop.com/Toshiba/Toshiba-Satellite-P300D.html

If I may ask;
1) Is there obvious damage to the LCD screen?

2) If there is not obvious damage to the LCD screen, have you used an external VGA monitor with the laptop?

To see if the problem is the graphics chipset, or the video cable, or inside the Display Assembly.

A) http://www.irisvista.com/tech/laptops/Toshiba-Satellite-P305/take-apart-notebook-1.htm

B) http://www.irisvista.com/tech/laptops/Toshiba-Satellite-P105-P100/remove-lcd-screen-inverter-1.htm


Post back in a Comment.
Regards,
joecoolvette

[Primer:
An LCD screen cannot produce light by itself,
(Click on the monitor icon,

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

It 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.

LED stands for Light Emitting Diode

CCFL stands for Cold Cathode Fluorescent Lamp.
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/

Observe the last 8 photos especially. This article shows you that the LCD screen is an assembly. It is composed of layers. Just like the 3M company's tutorial. Also shows general instructions for replacing a Backlight.

A screen Inverter is used to convert the power from the laptop, for the LCD screen, and Backlight.
It is a small circuit board, and is usually mounted towards the bottom of the LCD screen, and behind the Display Bezel.

A CCFL, (Or two of them), uses a screen Inverter.
LED backlighting however, may or may not use a screen Inverter.

Using LED's for backlighting is relatively new, when discussing backlighting technology.
Some of the first designs of LED backlighting does use a screen Inverter.
Newer designs do not seem to.

90 PERCENT OF THE TIME the problem can be attributed to a bad screen Inverter.

Aug 21, 2012 | Toshiba Satellite Computers & Internet

1 Answer

The screen flickers when opening laptop.


It's one of two things, either it's the backlight inverter or it's the switch which tells the laptop the lid is closed.

The backlight inverter is what powers the lamps in the back of the screen.They aren't expensive, but a computer shop will probably charge you an arm and a leg to replace.

The switch tells it to turn the backlight off when the lids is down to save power.

If it's the switch, you can disconnect it by following this guide http://forum.notebookreview.com/showthre… and http://forum.notebookreview.com/showthre… according to that if it thinks the lid it will turn the blue touchpad LED orange to indicate the touchpad is locked.

Jun 02, 2010 | Panasonic Toughbook CF-51 Notebook

1 Answer

My Roland kr-5 digital piano has the touch screen but over the last yr has gradually faded so I cannot see what is on the screen unless I bend right down on an angle and even then it is very hard to make...


probably wont need a new screen, its probably got led backlights in this is the case these may of been dying, take out the screen and if you can see leds switch it on and see if the leds light up, if now just replace them.

If it uses a bulb in the screen then you can try to get a replacement bulb or just get the whole screen.

There is a slight chance that it could be the backlight circuit in which case changing the backlight/screen wont help.

If you have a multimeter test that the backlight for voltage, to make sure it not the backlight power supply

Dec 11, 2009 | Computers & Internet

1 Answer

Led backlight on display for m1330 xps dell


This model laptop uses a CCFL lamp for the backlight, it does not use LEDs for backlighting.
The CCFL lamp is attached to an inverter which supplies high voltage to this lamp.
For details on how to install and or replace CCFL lamps go to
www.lcdparts.net for information and parts.

I assume you are not replacing the whole LCD screen.

Jun 01, 2009 | Dell Computers & Internet

2 Answers

Boot Problem


try to insert the battery charger into the laptop without the battery.

Dec 24, 2007 | IBM ThinkPad T30 2366 Notebook

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