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LCD NO DISPLAY

EVERYTIME I CLOSE MY CLOSE MY LAPTOP NO DISPLAY APPEAR AY MY MONITOR AND WHEN I SLIGHTLY TOP MY LCD IT APPEAR.

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  • rldator Dec 31, 2008

    where can I find the Micro switch

  • Ed Deguzman
    Ed Deguzman May 11, 2010

    Are you using a docking station where you use an external monitor ?

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  • 41 Answers

Hi rldator
Laptop have a built in micro switch that puts the laptop in sleep mode when you close the notebook.
Regards Go-Tech

Posted on Dec 30, 2008

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I have sony vaio pcg7176-p laptop but the screen goes on and off everytime iam using it.what could be the problem?


Sounds like the video cable inserted from the motherboard to the laptop LCD is loose. I've seen several of these come loose and display similar behaviors. Best way to validate that is to hook up an external monitor to the laptop first. If the same thing happens with the external monitor, the problem is likely the video chip on the motherboard and the motherboard should be replaced.

If the external monitor is normal, than it is likely a loose cable on the back of the laptop LCD. I've seen this several times; especially recently. You have to get to the back of the LCD and reseat the cable. Then reinforce it with a piece of packing tape or a strip of duck tape. The cable sometimes dislodges over a period of time from opening and closing the laptop lid.

If that doesn't work, then you should try replacing the LCD itself. The back light could be going out.

Feb 18, 2015 | Sony Computers & Internet

1 Answer

Vertical strip of flashing horizontal lines on Acer Aspire 7551G screen


More than likely it's the lcd screen and will have to be replaced. I could be the video card, but most likely the lcd screen especially when you can put pressure on the screen and cause changes. To isolate the problem try connecting another monitor to the computer. Borrow a monitor from a neighbor, friend, relative or co-worker and connect it to the laptop. If the Borrowed monitor displays ok, then the problem is with your lcd screen and the video card is ok. If the Borrowed monitor displays the same as your lcd screen then the problem is with your video card inside the computer.

Plug in an external monitor and see if the display shows up on it. It can be any kind of monitor even the old big fat crt monitors as long as it has a vga cable to connect to your computer's vga port. If so that proves your video card is ok. The video will show on most systems when you reboot without you having to do anything. Some systems will require you to hit the FN (Function key) + F1 thru F12. Hold down the FN key then hit the correct key for displaying on the monitor (F1 thru F12). The correct key will normally have CRT/LCD on it or it will have the icon of a display.

Once you narrow it down to the lcd screen as being the problem you might try taking the lcd screen apart to reseat the lcd cable on the back at the top of the lcd. Just unplug it and plug it back into the connector. You can also try doing the same where the lcd cable plugs into the motherboard. Just pull it out and put it back.

May 31, 2012 | Computers & Internet

1 Answer

My averatec laptop will only power on to a black screen but it still sounds like its booting


1) Laptop on use a flashlight, and shine it at the LCD screen. Shine at various angles.
Do you see faint images?

2) You can also plug in a VGA monitor to the back of the laptop, (Laptop OFF, monitor off), and toggle over.

(It can be a VGA monitor that looks like a small TV {CRT}, or an LCD flat screen that has a VGA cable attached)

Plug the VGA monitor's cable into the blue VGA port on the left side, of the Avertec 3200 Notebook PC.
(Example of VGA connectors,

http://en.wikipedia.org/wiki/VGA_connector

Turn the VGA monitor on. Give it time to 'come to life'.
Turn the laptop on.

Are there graphics on the external monitor? If not press, and hold down on the Fn key, (Blue Fn next to the CTRL key), then tap the F2 key.

(The F2 key is the toggle over key for an external monitor. You can use the laptops LCD screen, or it's screen, and an external monitor)

Graphics show on the external monitor? Your graphics chip is good.

Problem is with the screen Inverter, or the Backlight.

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

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

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

90 percent of the time the fault is the screen Inverter.

The Display Assembly essentially is;

1) Top cover of the laptop. (Display Cover)
2) LCD screen
3) Display Bezel. (Thin plastic frame in front of the LCD screen, and surrounds the LCD screen)
4) Inverter
5) Backlight
6) LCD screen frame

With the Display Bezel removed, the screen Inverter should be at the bottom/front.

This is an example of a screen Inverter for an Averatec 3200 from a quick search,

http://www.laptopaid.com/averatec-3200-lcd-inverter-board-76-030105-02-tested-1629.html

I haven't worked on an Averatec 3200 Notebook PC before. I have worked on 100's of other laptops.
The sequence for removing the Display Bezel follows a pretty standard approach.

Looking at the Display Bezel I see four screw covers. (I'm looking at a PDF Users Guide)

One at the top Right corner, one at the top Left corner, one at the bottom Left corner, and one at the bottom Right corner.

These screw covers made of a rubber-like material. (Synthetic rubber) They are slightly rounded on the top. They have a type of rubber cement that holds them in place.

I use a computer pick to gently pry them off. If you carefully pry each screw cover off, and set them down sticky side up, (Screw side), you can usually reuse them again.

Screw covers (4) removed, use a Philips head screwdriver, and remove all 4 screws.

The Display Bezel will still be held in place. It has plastic tabs on the outside edges that snap into the Display Cover. (Top cover of laptop)

A fingertip is used on the INSIDE edge of the Display Bezel, next to the LCD screen.
(WATCH your fingernails against the LCD screen)

The fingertip raises the Middle/Inside edge of the Display Bezel, just slightly.
Now use another fingertip on the opposite side. Raise the Middle/Inside edge.

The Display bezel should start 'popping' out. (As the plastic tabs release they make a popping, or snapping sound)

To illustrate this technique further,

http://www.insidemylaptop.com/replace-damaged-lcd-screen-dell-latitude-e5400-e5500-laptop/

http://www.insidemylaptop.com/replace-lcd-screen-inverter-dell-inspiron-1525-laptop/

(One more, to show you where I believe the screen Inverter is for the Averatec 3200 Notebook PC, and what an average screen Inverter circuit board looks like,

http://www.insidemylaptop.com/remove-screen-inverter-dell-studio-1737-1735-laptops/

When the Display Bezel is loose, you slide it to one side a little to ease it around, and off, of the cover latch.

The cable connectors going to the screen Inverter are shaped differently from each other, so that when you go to reinstall them, there is no chance of mixing them up.

With the tools you have available, I would replace the screen Inverter ($7 plus shipping), and see if this repairs the problem.

If not the problem is the Backlight. Most of the time you have to buy the LCD screen, as the Backlight is an integral part of it, and should be replaced by a professional.

[ An LCD screen is composed of layers. The layers are held together in the correct alignment by the LCD screen frame.
This alignment MUST be aligned as it was from the factory.

This gives you an example of replacing a Backlight,

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

Make a mistake here, and you can throw your LCD screen in the trash ]

For additional questions please post in a Comment.

Regards,
joecoolvette

Aug 21, 2011 | Averatec 3200 Notebook

1 Answer

While at home I plug a wide screen monitor into my Dell studio 1737 Laptop. As long as I keep my lid open the icons and print on my monitor are the right size. When I close the lid, icons and prints get...


You appear to be cloning your internal LCD and as long as it is active, the resolution setting for the LCD is also controlling the resolution of the external monitor. When the LCD is closed, then the default resolution of the external monitor is being used by Windows 7 (It apparently has autodetected the size of the monitor and knows the Highest optimal resolution it will display.) The higher the resolution, then smaller the icons.
To resolve, go to display properties and check the resolution of the internal LCD and then set the External display to the lower resolution.
You should be able to wake the system with an external keyboard, by pressing the spacebar, if the system is sleeping

Jul 24, 2010 | Dell Studio 1737 Laptop

2 Answers

No display on screen every now and then on my hp 530 laptop...


A bundle of wires runs from the laptop to the screen past the hinge, if the wire gets crimped you can get a short that will cause video issues. If you can wiggle the screen back and forth, bump the laptop, close the top slightly, etc. and change the display appearance, that's probably your issue. Replacing the wires is usually pretty easy but soldering them back to both the board in the system and the LCD panel could be difficult.

Mar 08, 2010 | HP Business Notebook 530

1 Answer

Moniter's display related problem


Hi,

Its LCD problem. Its unrepairable. This happen when unbearable weight has placed on laptop LCD or mishandling of the laptop. Better to ignore it or replace your LCD.



Regards;
Hassan

Jul 25, 2009 | Lenovo ThinkPad T500

3 Answers

How do you connect an LCD monitor to lap top


follow the steps on this page:
http://ask-leo.com/how_can_i_keep_my_laptop_running_with_the_lid_closed.html

Click on this link or copy and paste the complete link into your browser.
If I could be of further assistance, let me know. If this helps or solves the issue, please rate it.
Thanks, Joe

May 01, 2009 | Balance CN6555 Notebook

1 Answer

MY ACER LAPTOP SCREEN TURNS ON BUT THE SCREEN IS BLACK


To determine if you have a video card problem or the LCD screen is at fault.
Connect an external monitor to the video port on the laptop and boot up your laptop, if you get a display on the external monitor then your video card is OK and you have a faulty LCD.

When you power your laptop without an external monitor and have a close look at the LCD screen at and you see a slight image then the fault is with the backlighting panel. This fault could be a faulty inverter or a faulty CCFL backlight lamp.

Defective CCFL backlight may has 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.
  • Picture flickering on and off.
The inverter can be easily replaced so can the CCFL lamp (but requires a lot more work)
For info on parts and repair service goto www.lcdparts.net

Mar 02, 2009 | Acer Aspire 5610-4648 Notebook

2 Answers

Flickering screen on startup


Sounds like hardware. Several possibilities come immediately to mind:

1) Backlight is going bad. (It's a fluorescent light).
2) Bad inverter
3) Loose or bad cable in laptop hinge

If the picture is OK using an external monitor, it's probably one of those three.

I've used these guys before for screen repair: Unknown document title.

http://www.notebookmechanix.com/


Feb 06, 2009 | Acer Aspire 3003LCi Notebook

2 Answers

Monitor is blank!!!!


Firstly, the LCD+external setting will switch one or the other or both on.

Secondly, if you go into your display properties (or even the advanced page where your video card additional features are) you can usually select which monitor is "primary".

I suspect that your external display is primary, and the LCD screen is not "enabled" or used as part of the desktop.

The settings are all there, it's just a matter of finding them (depending on what video card is in whatever laptop you have)

This might have happened in the first place if you accidentally hit "Fn" and one of the "F" keys up the top. Fn + F6 on my laptop will switch LCD/external monitors on and off. (for example) There is usually a little blue picture on one of the "F" keys to denote that function.

Sep 09, 2008 | Toshiba Satellite A105 Notebook

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