Question about Dell Latitude E6400 Laptop

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Led backlight dell e6400

I have an e6400 that had footlights at the bottom of the display..looks likehalf the lights alight and half off. Is this a symptom of a led backlighted LCD? If you giggled the power cable at the bottom of the LCD they would all light .. but it got worse and now none light? Is this a common problem? How t fix?

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  • Dell Master
  • 12,223 Answers

If you are sure the LCD is off, is symptom the you must replace.
You can run the utility for diagnostic, you can connect another monitor? and test. Otherwise you need to replace it by yourself, or go to the repair shop computer.
God bless you

Posted on Jul 30, 2013

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Posted on Jan 02, 2017

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SOURCE: Dell latitude Cpi LCD screen Backlighting?

What do you mean exactly?

To increase or decrease the backlight brightness use Fn-key(next to left Ctrl-key) with up and down arrows.

There is not some key-combination to turn off the screen, you can make your computer turn it off after some time (if you're using XP this can be done in control panel->Power options), or just close the lid :)

Posted on Mar 25, 2008

Joed911
  • 4338 Answers

SOURCE: where is the LCD backlight inverter on an Inspiron

The inverter is in the LCD, below the actual screen. It controls the brightness and the contrast on the laptop. Here is a link where I purchase them:
http://www.smartmicrousa.com/dell-inspiron-e1705-laptop-inverter-board.aspx

It is easy to replace. Here is a link that will guide you:
http://www.ehow.com/how_4841734_dell-laptop-inspiron-e-backlight.html

Posted on Apr 21, 2009

Geekman
  • 32281 Answers

SOURCE: 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.

Posted on Jun 02, 2009

heavymetal77
  • 721 Answers

SOURCE: My Dell inspiron LCD 1525 has broken. The power

You need a new lcd screen & while at it replace the inverter.

Posted on Jul 14, 2009

  • 28 Answers

SOURCE: no backlighting on keyboard

The backlight is intergrated into the keyboard itself, so your problem does not seem to be a keyboard problem. Make sure you have tried toggling the backlight (Fn + right arrow) and that when you fitted it, no connections are loose.
If all else fails, and your warranty is still alive, contact Dell again and describe your problem.

Hope this helps,

Tiger720

Posted on Sep 13, 2009

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Sounds like a damaged display or GPU. Try an external display to confirm either way.

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It's probably the 'invertor', not the backlight or powersupply. That is assuming that the power-led does turn on ?

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Dell backlight indicators


A computer monitor has a front-mounted LED that displays its current status and flashes in the event of an error. When an error occurs, the flashing may be accompanied by an error message on the screen. If the screen does not display an error message, the problem most likely falls into one of four common categories.

Unsupported Display Mode A video card has the ability to send output to the monitor at many display resolutions and refresh rates. However, no single monitor is capable of supporting every possible display mode. When the video card sends an unsupported display mode to the monitor, the monitor shuts off to prevent damage and blinks, or displays an error message. Standby Mode b> When a monitor detects no video signal from the computer, it assumes that you have turned the computer off and enters standby mode to reduce power consumption. Dell and HP monitors display an amber light when in standby mode. The status light on an Apple monitor blinks slowly. Incorrect Power Supply Some monitors such as certain Apple Cinema and Studio displays use external power adapters. Because different power adapters may have similar connectors, these monitors are designed to detect when an incorrect power supply is connected and blink the status LED rather than attempting to turn on. In the case of an Apple display, the LED blinks in an alternating short and long pattern. b> Backlight Failure b> A flat panel LCD display has an LED or fluorescent backlight that illuminates the pixels and makes it possible to see the contents of the screen. If the backlight fails and requires replacement, the monitor is unable to display any information. In some cases, you may be able to resolve this issue by turning the monitor and computer off, disconnecting and reseating all cables. If the monitor still has a backlight issue, it requires professional service.

Jan 14, 2013 | Computers & Internet

1 Answer

In my dellvostro a860 , rite side of the screen colours are spreaded,it it looks like shade,,whats the problem in that i m not getting please help me..........


It is the screen Inverter, or the LCD screen itself.

Screen Inverter: A small circuit board located behind the Display Bezel, and mounted towards the bottom of the LCD screen,

http://support.dell.com/support/edocs/systems/vosA860/en/sm/display.htm#wp1183775

The yellowish long object, at the bottom, is the screen Inverter.

Here is another look at it,

http://www.batterycenturys.com/dell-vostro-a860-inverter-p-185294.html

Dell Support > Vostro a860 Notebook PC > Service Manual,

http://support.dell.com/support/edocs/systems/vosA860/en/sm/index.htm

In the list clicking on -> Display, will get you to the first link above.

Need guidance in replacing the screen Inverter, post in a Comment.

(Just a basic guide using a Vostro 1014/1015 Notebook PC. Not yours, but good for basic guidance. This is replacing the LCD screen,

http://www.insidemylaptop.com/replace-lcd-screen-dell-vostro-1015-1014-laptop/
)

[ Primer:
An LCD screen cannot produce light by itself,

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

( Click on the small window with the monitor in it )

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 used as lights.

The Dell Vostro a860 Notebook PC uses one CCFL, for a Backlight, OR there are Vostro a860's that use LED lights.
(If you replace the LCD screen, make sure FIRST of what type of Backlighting it uses)

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

[Average thickness of a CCFL 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 ]

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

Most of the time the fault is the screen Inverter.

The Vostro a860 Notebook PC's, that uses LED's as a Backlight, MAY also use a screen Inverter.

Primer over.

For your problem it could be the screen Inverter, but I lean more towards the LCD screen itself, is the problem.

How to test a screen Inverter? Requires a very sensitive multimeter.
Read; Expensive,

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

For a layman who does not have access to a sensitive multimeter, the method is to just replace the screen Inverter, and see if it is the problem.
'Parts changing', I know, but if you do not have the proper equipment to test with?

Screen Inverter replaced, and problem still persists, replace the LCD screen,

http://www.laptopscreen.com/English/model/Dell/VOSTRO~A860/

For additional questions please post in a Comment.
Regards,
joecoolvette

Jun 23, 2012 | Dell Vostro A860 Notebook

1 Answer

Dell inspiron


Meaning the graphics chipset is OK.

Problem lies with the Video Cable, or Display Assembly.
(Dell: Display Panel Cable = Video cable)

The Display Assembly is the;
1) Display Bezel: Plastic thin frame in front of the LCD screen.

2) LCD screen (Dell = Display Panel)

3) Screen Frame: The thin metal frame which surrounds the LCD screen layers, and also holds them in place. (Resembles a picture frame, and can be disassembled)

4) Camera (If applicable)

5) Screen Inverter: (Dell = Display Inverter)

The Display Panel Cable (Video Cable) is a thin flat ribbon cable.
One end connects to the motherboard, the cable then goes up by the left Hinge, and the opposite end connects to the back of the LCD screen, in the Display Assembly.

1) A connection may be loose. One end of the video cable may be loose, to it's connector.
BOTH the connection on the motherboard, AND the connection at the back of the LCD screen, need to be checked.

This means partial disassembly of the laptop body, to check the motherboard connection. It is under the Keyboard.
ALL power removed from laptop, AC adapter (Charger), and Battery, the Center Control Cover needs to be removed next, then the Keyboard,

http://support.dell.com/support/edocs/systems/ins1545/en/SM/keyboard.htm#wp1179911

Also look at the condition of the sheath, of the video cable. If there looks to be apparent damage to the sheath, the tiny thin wires inside may also be damaged. (Stretched/Broken)

Checking the connection of the video cable at the LCD screen, requires opening the Display Assembly.
This requires removing the Display Assembly first,

http://support.dell.com/support/edocs/systems/ins1545/en/SM/display.htm#wp1109848

Both connections check out? Prove to be tight? (If you open the Display Assembly, and the video cable falls off, it wasn't tight)

I would then suggest performing a continuity check of the video cable.
Check each wire in the video cable. (Multimeter set to Ohm's, see if electricity passes through the wires. Continuity)

If the video cable proves to be good, then the screen Inverter is next.

An LCD screen cannot produce light by itself. (Or enough 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 Dell Inspiron 1545 Notebook PC uses a CCFL as a Backlight.

A CCFL is a Cold Cathode Fluorescent Lamp.
Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.
{ Example: 2mm Wide and 334mm Long. That is approximately a little thicker than 1/16th of a inch, (.078), and a little longer than 13 inches }

A screen Inverter converts the power (Electricity) from the laptop, for the Backlight, and LCD screen.

90 PERCENT OF THE TIME the fault is the Inverter.

Fortunately it is also the cheaper of the parts, when compared to an LCD screen, and is easier to access.

It is behind the Display Bezel, and mounted at the bottom of the LCD screen frame.

[ In the Display Assembly link above scroll down to the subheading -
Display Bezel.
In the first photo under the subheading, the screen Inverter is shown at the bottom, of the LCD screen.

This example shows it in more detail,

http://www.batterysupport.com/dell-inspiron-1545-inverter-p-206027.html

To test a screen Inverter you need a sensitive multimeter. This = $$$$
(Or you can use a good Inverter to test)
Barring that the two examples above are not feasible, the alternative is to buy, and replace the screen Inverter.

A) Video Cable checks out it's on to the screen Inverter.
B) Replace screen Inverter does not fix the problem, the problem is a bad LCD screen.

I'm betting on a loose connection of the video cable, at the back of the LCD screen. Just my thoughts.

Post back in a Comment, (Or Comments), as to your findings.

Regards,
joecoolvette

Jan 17, 2012 | Dell Inspiron 1545 Laptop

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How's Dekcell brand battery for my Dell E6400?


want to find out how's your working?

~er~

if you want buy Dell E6400 battery cheaply ,you'd best buy it at professional online store such as udtek.com


Feb 23, 2010 | Dell Latitude E6400 Notebook

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

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