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My lcd screen lights are out.can't see screen

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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

Changed the lcd screen but all i have is a white screen


1) Loose connection of the Video Cable TO the motherboard, and/or TO the back of the LCD screen.

Can easily happen when reassembling.
(If you can't reuse the sticky tape on the back of the LCD screen, that holds the Video Cable to it, use more tape )

2) Incompatible LCD screen.
MATCH up the manufacturer's numbers on the back of the old LCD screen, to the new one.

They MUST crossover, and match up, if they are two different LCD screen manufacturers.

The screen Inverter is MATCHED to the LCD screen, also.

Matching up the Model Number, (Product Number for HP), may not be all the info you need.
Matching the numbers off of the old screen, for the new one, is.

http://www.sparepartswarehouse.com/HP,Mini,1000,Laptop,LCDs-Displays.aspx

Under the red heading - Find Your Spare Parts - click on the blue Down Arrow to the right of the - Choose Model - box.
What Model is yours?

Write down the manufacturer and product ID number.
Now go to the far upper left of the page. In the box under - Part Number Search, type the letter/numbers for your old LCD screen.

On the page that comes up. Do they match?
Putting the letter/numbers in for the LCD screen you just purchased.
Do they match?

IF the old LCD screen works at all, reconnect it, and see if it works.
If so the LCD screen you purchased does not.

3) Make SURE the screen Inverter cables (Wires) are connected tightly.

[ Check the connection of the Video Cable to motherboard first.
Then the Inverters wires, then the Video Cable connection at the back of the LCD screen ]

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

The HP Mini 1000 series of Netbook PC's uses a CCFL.
Cold Cathode Fluorescent Lamp.

Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.

OR a series of LED lights. Depends on the model. (8.9 inch LCD screen models usually use CCFL. 10.1 models usually use LED lights)

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

Make sure there is 6 Volts DC power going through the Inverter.

[ NOTE*
90 PERCENT OF THE TIME the fault is the Inverter ]

http://h10025.www1.hp.com/ewfrf/wc/manualCategory?cc=us&dlc=en&lang=en&lc=en&product=3832471&

HP Mini 1000 and Compaq Mini 700 - Maintenance and Service Guide

For additional questions please post in a Comment.

Regards,
joecoolvette

Jan 28, 2012 | HP Mini 1000 Netbook

1 Answer

The green light comes on but the screen wont light up, meaning the tv wont turn on


hi,
You have to check the back light of your lcd TV. All lcd screen have a back light to illuminate the pixels. you can conform is the back light is faulty or not by watching the lcd screen nearby. Watch can you see any image (negative image) on the screen. you have to look very closely. if you see any image on the screen then the back light or the back light inverter is faulty.

You have to check the back light inverter board. Normally in lcd monitors you can see three circuit boards. power supply, mother board, and the inverter board. If available then try to replace the inverter board. There are high voltage transformers in this board. There is a chance for its winding get short. You will not get the transformer in open market. Try for the inverter board .
ok

Jun 09, 2011 | iSymphony LC24IFH7PB LCD TV

1 Answer

Hp g5000 sreen does not light up as usal, i can see a the start up when i shine a torch at the sreen, what do i need to do to get working.


An LCD screen cannot produce enough light by itself. It needs an additional source of light.
A Backlight is used as the additional light source.

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

The LCD screen is a composite of layers, surrounded by a thin metal frame that resembles a picture frame.
To one side of the LCD screen layers, and under the frame is usually where the Backlight is mounted.
[Note* Two Backlights are used in some models]

Replacing a Backlight is more labor intensive than replacing an Inverter.
Due to this, and the cost, the LCD screen itself is replaced as a unit most of the time, when it comes to Backlight replacement.

Example of a replacement LCD screen for the HP G5000 series of Notebook PC's,

https://www.screentekinc.com/HP_G5000_Series--15.4-inch--1280x800-wxga-laptop-lcd-screen.shtml

[Note* Stating HP G5000 is just stating the model series. When buying replacement parts the EXACT Model Number should be used. This information is located on the bottom of the laptop, in a white Service Tag.

When replacing an LCD screen, the model number of the replacement LCD screen should be matched to the existing LCD screen's Model Number.
Inverters and LCD screens are matched together. Make sure you get the correct part]

An Inverter is used to provide power from the laptop to the LCD screen, and to the Backlight.

Note* 90 Percent of the time the problem is a bad Inverter.

Example of an Inverter for an HP G5000 series notebook PC,

http://www.zlectronic.com/product/INVERTER-FOR-HP-DAC-07B035-DAC-09B017-DV5000-G5000.html

The LCD screen, Top Cover, Display Bezel, Inverter, Backlight, and various screws, make up the Display Assembly.
The Display Bezel made of plastic surrounding the LCD screen, and in front of the LCD screen is removable.
Behind it is easy access to the Inverter.

The Inverter is approximately 4 inches long, and the width of a No.1 pencil.
Usually located at the bottom of the LCD screen, and right behind the Bezel.

This article shows replacing an Inverter and LCD screen on a Compaq Presario v2000 series Notebook PC,

http://www.insidemylaptop.com/replace-lcd-screen-inverter-compaq-presario-v2000-laptop/

This pictorial guide is not for the HP G5000 series Notebook PC, but the models are very similar when it comes to Inverter replacement.
The above link is to show you what is involved.

Please post questions in a Comment.
Regards,
joecoolvette

Apr 03, 2011 | Computers & Internet

2 Answers

Lcd light


More than likely you will need to replace the LCD screen. The backlight may have burned out making it blank.

A new LCD screen runs about 15 dollars shipped from ebay2.gif.

The W580i LCD screen is very easy to replace. Probably one of the easiest I have ever done.

Check out the following link for instructions on replacing the LCD display and links to buy the screen.

Sony W580i LCD Screen Replacement

I hope that helps you out

Jul 24, 2009 | Sony Ericsson Walkman W810i Cellular Phone

2 Answers

My phones display lights are not working.


Friend, it is in the keypad/light interface be sure it is firmly attached.press a little of that connection to restore the lights.

Jul 11, 2009 | Sony Ericsson Walkman W810i Cellular Phone

1 Answer

No display light


It is possible that the backlight on your LCD is burned out. If you have a friend with a Sidekick LX, see if you can swap the lcd screens quickly. This will let you determine if it is the phone or the LCD screen

Here is a link to show you how to remove and or replace the Sidekick LX Screen

Sidekick LX LCD Screen Replacement

Apr 07, 2009 | Sharp Sidekick LX Smartphone

2 Answers

My screen is blank


Is the screen white or just dark?

Fix Sidekick White LCD Screen

If it dark or no light at all then

replacement of the Sidekick 3 LCD flip screen.

to buy a sidekick 3 lcd screen look here.
http://www.repairmysidekick.org/Sidekick-LCD-Screens/buy-a-t-mobile-sidekick-3-lcd

Look for one that has the torx screwdriver included

Jul 07, 2008 | T-Mobile Sidekick® 3 Cellular Phone

1 Answer

Really need help please


In both cases you lcd screen has died, the backlight will usually go first.

Fixing them is easy, a new lcd screen assy can be purchased from ebay for less than 45 dollars. It only take the removal of 2 screws to replace it. Read throught the procedure below.
Sidekick 3 LCD Flip Screen Replacement

Here is the link to new screens

Sidekick 3 LCD Screens for sale

Jun 14, 2008 | T-Mobile Sidekick® 3 Cellular Phone

2 Answers

The LCD screen is hard to see. What should I do?


If the LCD screen is too bright or too dark, adjust the LCD Brightness setting in the Setup Menu. If you are shooting photos outdoors in bright light, move the joystick to the icon showing the sun over shaowed area to turn on Outdoor mode and make the LCD screen easier to see in bright light.

Sep 12, 2005 | Epson PhotoPC L410 Digital Camera

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