Question about Computers & Internet

1 Answer

Laptop screen becomes black after 1 second

An external screen works fine, but the built-in screen is black. It will show a normal looking image for 1 second or shorter when the screen configuration is changed or when the screen is turned off and on with the function keys, but then it becomes black again with a low but audible click.

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Computers & ... Master
  • 5,660 Answers

You have to diagnose the problem.......


Right off hand I would say the screen Inverter is bad, but this is just guessing......

Why?
Because your laptop may not use a screen Inverter.
It may use LED's as backlighting.


Or, it may have a pinched/damaged video cable.......


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 larger 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.


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


A laptop that uses a CCFL, (Or more than one), uses a screen Inverter.
A laptop that uses LED backlighting, May or May Not use a screen Inverter.


Seems when the LED backlighting technology first came out, a few laptop models Did use a screen Inverter.
As the LED backlighting technology evolved, a screen Inverter was no longer used.

Average example of a screen Inverter,

http://www.amazon.com/Screen-Inverter-HP-Pavilion-DV6000/dp/B0058TMLLY

The LCD screen is in the Display Assembly.
The plastic frame in front of the LCD screen, is the Display Bezel.
(Different manufacturers use different terms. The above is for HP, and Compaq laptops)

Display Bezel removed, the screen Inverter is located at the bottom of the LCD screen.
That is IF, the laptop uses a screen Inverter.
If the Backlight is bad on a laptop that uses LED backlighting, the LCD screen itself is replaced.
The LED backlighting is built-in.

The Video Cable, (Display Cable, etc), connects to the motherboard, usually under an area under the Keyboard, or just above it. Some models have the Video Cable connecting to the Bottom of the motherboard, and at the back.

Average example of a Video Cable,

http://www.amazon.com/Video-HP-Pavilion-DV6000-FOXDDAT8ALC0041A/dp/B003YDLDBK

The Video Cable then routes through Channels, and Latches; and comes up around the left Hinge.
It then goes on to up into the Display Assembly.

Depending on the technology used, (screen Inverter, or no), the Video Cable splits off, and connects to the screen Inverter.
The rest of the Video Cable then connects to the back, of the LCD screen.

Due to just normal opening, and closing of the laptop; the Video Cable may become pinched, and/or pulled on.

This can cause the connection at the motherboard to become loose, and/or at the screen Inverter, (IF used), and/or at the back of the LCD screen.

It may also cause damage to the Video Cable. (Stretched/Broken)

Point?

1) May be just a loose connection/s of the Video Cable
2) May be a damaged Video Cable
3) May be a bad screen Inverter
4) May be a bad LCD screen.

Post in a Comment, as to the laptop manufacturer name, and model number.

This way I can step by step you through diagnosing the problem, for YOUR laptop; and not post a bunch of generic information.

HOWEVER, it does depend on if the information is available on the internet. Such as a free Service Manual, and/or pictorial guides.

I CAN guide you even if there is not, but if there is; it just makes it simpler for you.

I can tell you it is easy. Once you have performed this procedure, you may want to do it for a friend, or relative; if the situation arises.

Regards,
joecoolvette

http://www.insidemylaptop.com/

Posted on Jul 09, 2013

Testimonial: "Thank you. It is an EMachines E727 with 15.6" 1366x768 pixels LCD screen."

Ad

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad
Benimur
  • 6966 Answers

SOURCE: Data Shows up only on External Monitor, not on Laptop Screen

Hi,

Since the laptop works on the external monitor, then it would be safe to assume that it is only the L:CD display part that is the issue. Often LCD display (of laptops) are working but only that you can see the actual display. One way to verify is to shine a flashlight at an oblique angle to the screen, semblance or part of the desktop could be seen. If the desktop could be seen (albeit very very dark background) then it could either be the CCF Lamps (cold cathode florescent) or the inverter that powers the lamps.

Often, the defective component would be the inverter. It is relatively easy to replace the inverted. It is sometimes more difficult and challenging cracking open the casing of the display panel of the laptop than replacing the inverter. Additionally, inverters are readily available online. It is also not surprising that inverters for other brands/models would also be used in your Toshiba.

This would be a good place to start for inverter boards. This is a nice tutorial if you are considering a DIY.

In some worst case scenario, it could be the video interface or even a loose/open flat cable from the laptop's main body towards the LCD display panel.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on May 08, 2008

IB4G2008
  • 3587 Answers

SOURCE: no screen on starting laptop

remove the battery from bottom, plug into ac power pack, and try it that way

Posted on Jun 01, 2008

bunnydawg
  • 5158 Answers

SOURCE: mouse frozen in screen center

i presume you still have the manual for that computer.... i believe the newer computers allow you to shut off the touch pad... look for the key combination for that

Posted on Mar 16, 2009

benwabnick
  • 2404 Answers

SOURCE: Dell Studio 17 laptop screen stays black

Awesome, I'm glad reseating the lcd cables did the job. Its crazy how the littlest things can cause such a mess sometimes. Your very welcome and when you get the chance, please rate my solution. Hope your weekend is a great one!!

Ben


Posted on May 16, 2009

  • 81 Answers

SOURCE: laptop inverter problem

you have major problem here - the power regulator on the motherboard which regulates the line voltage down to 12V to feed the inverter, and battery voltage /up/ to 12V to do the same, is blown. I've seen this happen in HP laptops - line voltage to the inverter on mains power reads at 18.2-18.5V (which overloads the inverter), on battery it reads 10.5-11 (which won't fire the inverter). This is usually a sign of a bigger problem. Usually one that involves replacing the motherboard.

Posted on Jul 21, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

What can i do to fix the Acer Aspire BlackScreen Problem for the internal Screen?


Screen problems on laptops come down to three issues. Most common is the inverter, next is the cable that connects the screen to the motherboard and last is the motherboard. If you can see the image on the screen with a flashlight, it is not the cable or the motherboard.

Mar 03, 2017 | Acer Aspire Computers & Internet

1 Answer

Black screen on laptop


When it is in that state, try hooking it up to an external display. Also look for a extremely faint image on the screen. If it's really faint you have a bad back light, if you see nothing but you get a display on an external monitor it's probably the display going bad.

Jun 05, 2013 | Computers & Internet

1 Answer

I have lenovo g550...my screen flickers in every 5minutes...


Failing Inverter An inverter, typically found inside a laptop computer, consists of a small board, which has impregnated electronic circuits stamped on it. Inverters look like thin boards about the of two sticks of chewing gum. The inverter and its bulb control the intensity of the liquid crystal display, which lights the screen monitor. The computer can control the output voltage of the inverter and either lighten or darken the screen. A special type of inverter can adjust the brightness of the screen by using an internal sensor to judge the room brightness, and then adjust the screen accordingly. Failing inverters give off some specific warning signs, which can be recognized by observing different screen characteristics.

Short Intermittent Display Upon turning on the laptop, the screen flashes on in the normal mode for a short period and then blinks to black. A very faint image appears in a dark background, which will be very hard to see almost invisible. After shutting off the laptop and restarting, the same mode occurs, where the screen appears normal for a few seconds then fades to black. This condition points to a failed inverter. To confirm this, plug in an operational external monitor; if the external monitor functions, the inverter has failed. b> Total Blackout with Ghost image b> The laptop turns on, as indicated by the power supply button, but the screen comes up black. The screen comes up black after restart. You might be able to detect a very dim or ghost-like image on the monitor. When you plug in a known functioning external monitor, the external monitor operates normally. This mode of display indicates a failed inverter. b> Long Term Periodic Operation b> With this failure mode, the laptop screen illuminates normally upon start-up and remains that way after several minutes, hours or even days, until it goes very dark again. Brightness controls or restoration attempts do not work. Most often, the screen will function normally with a computer restart, but will eventually return to black. Faint ghost images might appear, as seen in the total blackout mode. b> Dark With Color Variation b> Upon computer start-up, the monitor shows black or dark gray, accompanied by very faint images. The screen might have an intermittent color change, or remain on with a non-standard color variation, like pink or red. b> Auto Control Switch b> If the screen appears black, with no faint or ghost images, look for the lid switch near the back hinge. The switch, when depressed with a closed lid, shuts off the computer and monitor functions. Sometimes the switch becomes stuck in the closed position, disallowing the computer and monitor to turn on when opened. Pushing the switch manually several times can often free it up. If the switch tab has broken or jammed inside the case, it needs replacing. b> Loose Connection In this mode, the display looks normal upon start-up, but tapping the side case of the computer turns the screen black. More tapping results in the screen functioning normally then cutting out again. This condition points to a loose wire connection from the inverter to the LCD backlight lamp, or the video cable. The connectors can be accessed by removing the monitor bezel screws and pulling the plastic retainer off. Both connectors can be cleaned and refitted.

Feb 10, 2013 | Lenovo G550 PC Notebook

1 Answer

Latitude B130 screen works great then cuts out to complete black, works with external monitor


Are you sure that the display is not set for external monitor only? Also take bright flashlight and shine on the display. If you can see the images then the problem is with the back light and usually caused by a bad inverter. Some times you can get the back light or inverter bu most times it is easier and cheaper to replace the entire display.

Aug 20, 2012 | Dell LATITUDE Computers & Internet

1 Answer

My Fujistu Amilo laptop screen is blank, I can see nothing though I laptop seems to have booted and using a combination of tab and enter I have heard the windows login dingle. How can I work out if it's...


Hello there,
If the backlight is out, the screen image will still show up but there is no light to shine through it so you can normally see it.
The test that I've used is to get into a bright area(outdoors on a sunny day) and angle the screen around to perhaps see any of the displayed images.... or if indoors, get a flashlight and shine it into the screen at an angle and get your face up close and move the light around the screen rather close.
This may look and feel rather awkward, but I'll say that it has served its purpose many times in the past for myself in such diagnostics.

Should it be the LCD screen that has failed, but the backlight is still working, in a darker room you'd notice the screen go from completely black to a slightly lit-up "dark gray"... which would be a noticeable change, at least, in a darker room.

------------
As for the external monitor that you've got... I'd look into the blue 'Function-Key combination' symbols up alongside the F1-F12 keys... various laptops have a "Fn + F(1-12)" combination that will enable and output to an external monitor. Look for a blue-ish symbol that looks like two screens side by side, with a vertical bar in between them.
Alternatively, I've known laptops to just enable a secondary screen and run with it, if you plug the screen into the laptop before you turn the laptop on. Once you turn the laptop on it will duplicate exactly what the laptop is(or should be) showing.
However, i have seen Windows disable an external monitor once it gets to the login screen if it's not used to it being there - this is just to warn you that it may happen like that.
... Sheesh, also... some laptop bios's have settings that will enable or disable the use of an external monitor by default... that would be "the pits" in this case...

I hope that works out for you... follow up with any results and we'll try to go from there.

Mar 10, 2010 | Fujitsu Siemens Computers & Internet

1 Answer

LCD projector not displaying image of the laptop


On that Dell, you have to tell the laptop to display the image on an external unit--look on either F4 or F8--you will find a small TV screen symbol. You have to press and hold "alt" and press the key. The options are, 1-show image on just the laptop, 2-show the image on the laptop *and* something else, (like a projector), or 3-show an image on JUST an external display. NOTE: Sometimes, you have to turn on the projector FIRST, then immediately turn on the laptop so they boot together--just one of those strange things...(remember, **for example** first press of "alt" F4 will get you laptop and projector, second press of "alt F4 will get you JUST the projector, third press of the keys will bring you back to just the laptop)---Rick

Sep 07, 2009 | Panasonic PT LC75U Multimedia Projector

2 Answers

Gateway laptop seems to boot, but no screen and cannot do anything. Seems to boot up, but nothing at all is on the screen (not even the cursor). Power and wireless lights are on, can hear CD drive scan and...


Can you hear sound playing as if it were loading the Windows desktop? If so, there are are a few things to check for:

  1. Look VERY closely at the screen once the laptop is on. Can you make out very faint images? They will be hard to see and it's best to be in a well lit area at the time. If you do see images, then the backlight on your LCD screen has gone out. You will need a new LCD most likely.
  2. If you don't see any image at all, try plugging an external monitor into the laptop and booting up the laptop. If you see an image on the external monitor but not the LCD, then you may have a bad inverter/cable/LCD.
If you cannot get an image on the external monitor either, then your video card may be bad. Considering that a lot of laptop video cards are built-in to the motherboard, you may be looking at having to replace the motherboard of the laptop (about 2/3rds the cost of the laptop).

There may be other problems at hand, but those are the most common I've found in this type of situation.

Sep 02, 2009 | Computers & Internet

2 Answers

My notebook screen 3000 n100 goes dark after few second


This could be a faulty CCFL lamp.
To determine if you have a LCD screen, inverter or video card problem, read this and follow these instructions.
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.

Jul 15, 2009 | Lenovo 3000 N100 0689 Notebook

2 Answers

Screen goes black on my hp pavilion dv4000 notebook


Try connecting an external monitor to the laptop, power up the monitor first then boot up the laptop. The video data will switch to the monitor automatically, check if the monitor dislays a normal image and see if the image stays on the monitor.
Also press and hold the Fn key and press the F4 key, these keys toggle the video output between the LCD screen and the video port.
Test to see if this functions correctly.
Get back to me with the results of the tests.

Jun 03, 2009 | HP Pavilion dv4000 Notebook

1 Answer

Data Shows up only on External Monitor, not on Laptop Screen


If your system won't display anything w/o the external monitor. there's something wrong with the LCD's backlight. you may have to contact your laptop's manufacturer and check if this laptop is still under warranty. you may have to get the lcd replaced.

thanks.

Aug 26, 2008 | Toshiba Satellite A135-S4527 Notebook

Not finding what you are looking for?
Computers & Internet Logo

Related Topics:

86 people viewed this question

Ask a Question

Usually answered in minutes!

Top Computers & Internet Experts

Doctor PC
Doctor PC

Level 3 Expert

7733 Answers

kakima

Level 3 Expert

102366 Answers

David Payne
David Payne

Level 3 Expert

14161 Answers

Are you a Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...