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Hullo there, just want to open it up and look at the lcd screen connections just doesn't seem to light up. and yet an external monitor displays patrick

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This might be a sign of a faulty LCD cable or screen inverter board.
The LCD cable transfers data signal from the motherboard & video card to the LCD screen. It also supplies high voltage DC power to the screen inverter board. The screen inverter board works as a power supply for the backlight lamp mounted inside the LCD screen. It converts low voltage DC power to high voltage AC power needed for the backlight lamp.

Posted on Aug 25, 2010

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Connect to a monitor


When you connect an external monitor to your laptop, you have to switch the video signal from the laptop screen to the external monitor by holding down the blue lettered <FN> key and depressing the blue lettered Function (FN) key that has ( CRT/LCD ).

Jun 24, 2013 | Dell Latitude E6400 Notebook

1 Answer

Horizontal blinking lines appear on the screen of Sony Vaio VPCEL 10EL


Possible cause:

1. Video card failure.
2. Bad connection between video cable and LCD screen.
3. Bad LCD screen.
4. Faulty video cable.


Possible troubleshooting steps and repair solution:

1. First of all, test the laptop video output on the external monitor. If you see same flashing lines running through the image on the external monitor, you have a problem with the video card. If flashing lines appear only on the laptop screen, the failure is not related to the video card.

2. Just in case, try re-seating the video cable connectors on the motherboard/video card and maybe the back of the LCD screen. It' s not likely but possible that connection is loose and reconnecting the cable will fix the flashing lines.

3. If re-seating the cable connectors doesn't help, most likely you have a faulty LCD screen. The LCD screen has to be replaced.

4. If replacing the screen doesn't help, try replacing the video cable. It's very unlikely that this problem is related to the video cable but there is a slight possibility of that.

Oct 26, 2012 | Computers & Internet

1 Answer

Hp Pavilion DV-4000 Screen


Are you saying the lcd screen is black? It seems like it booted up but nothing appears on the screen?

Shine a flashlight on the dark screen to see if you barelysee the icons on the desktop. If so, then the LCD Inverter is bad.

Plug in an external monitor and see if the display shows up on it. It can beany kind of monitor even the old big fat crt monitors as long as it has a vgacable to connect to your computer's vga port. If so that proves yourvideo card is ok. The video will show on most systems when you rebootwithout 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 correctkey for displaying on the monitor (F1 thru F12). The correct key willnormally have CRT/LCD on it or it will have the icon of a display.

If you see no icons by shinning a flash light and the external monitor works,then your screen is bad. If you see no icons by shinning the flash lightand nothing shows on the external monitor, then most likely your video card isbad.

May 03, 2012 | HP Pavilion dv4000 Notebook

1 Answer

!!!no reaction on plugging the ac adaptor.!!!


Sound like the LCD screen's inverter is causing an short/overload and the power adapter is shutting down (thermal cutout).
Remove the LCD screen and connect an external monitor, power up the external monitor first and the boot up the laptop. The video should automatically on the external monitor. If the display on the external monitor is OK then the fault could be the inverter which is located at the bottom of the LCD screen between the hinges.
LCD screens and Inverters for your laptop maybe available from this WEB site.www.lcdparts.net

Apr 13, 2012 | Toshiba satellite c660

1 Answer

White horizontal lines running across laptop screen


I did not see any white lines, Simon, in the screenshot.
Just sayin'.
(Glad you tried to post it though!)

The problem is caused by a faulty Video Cable, or it's in the Display Assembly.

However, you better start the diagnoses with using an external VGA monitor, and see if the lines show up on the external monitor, also.
This would indicate a bad graphics chipset.

For most people that would mean replacing the motherboard.

A) Laptop OFF, monitor OFF, connect a VGA monitor to the VGA connector, on the Left side of the laptop.

Example of a VGA cable, and VGA port, (Connector),

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

You can use a external VGA monitor that is a CRT type, (Looks like a small TV), or a flat LCD screen monitor with a VGA cable.

A1) Turn the monitor on. If a CRT type allow it to warm up.
Turn the laptop on.

By default the display should show on the external monitor.
IF Not,

Press, and hold down on the Fn key, (Bottom left of Keyboard), and at the same time tap on the F5 key. (Top of Keyboard)
{The F5 key is the Display Toggle-Over key }

No?
There are at least 3 display options available.
1) Internal monitor of laptop ONLY
2) Internal monitor of laptop AND external VGA monitor
3) External VGA monitor ONLY.

Hold the Fn key down again, and tap once more on the F5 key.

Graphics look good on external VGA monitor?
Your graphics chipset is good.
Problem is Video Cable, or in the Display Assembly.

B) Video Cable: (LVDS Cable)

http://www.insidemylaptop.com/disassemble-acer-aspire-7551g-laptop/

The above is for an Acer Aspire 7751G, but it is close enough to the 7750G models, and info should directly crossover.

Scroll down to Step 17.
The Video Cable connection to the motherboard, is shown by the yellow arrow at the Top Left.

Note, although the photo is less than, the routing of the Video Cable.
It goes through the Left Hinge.
(Then into the Display Assembly, and connects to the back of the LCD screen)

With normal opening, and closing of the laptop, the Video Cable could be pinched, or have been pinched. Could have been pulled on.

You close the laptop, the cable is slightly pinched in the Hinge, and it pulls loose from the motherboard connection, AND/OR the LCD screen connection.

Doesn't take much of a loose connection. In fact it's hard to discern with the human eye, sometimes.
Make sure this motherboard connection is tight.

You have to open the Display Assembly, and check the Video Cable connection on the back of the LCD screen.

Doesn't look loose? Try to plug it in tighter anyway.

Check the connection of the wire/s from the Video Cable, TO the screen Inverter.
The small circuit board behind the Display Bezel, (LCD Bezel), and mounted to the bottom of the LCD screen.

When on the motherboard side, the side of the Video Cable that runs through the left Hinge, is there any apparent damage? Damage to the sheath of the Video Cable?

If there is, chances are the tiny wires inside the Video Cable, are damaged also.
Check with a multimeter. Perform a continuity test of Each wire.

C) Display Assembly:
Video Cable checks out then the problem is in the Display Assembly.

1) Screen Inverter:

http://www.sparepartswarehouse.com/Acer,Aspire-7700-thru-9800,Laptop,Inverters.aspx

http://www.insidemylaptop.com/replace-broken-screen-acer-aspire-5745g-laptop/

Not your model, granted. Posted for the Display Assembly dis-assembly pictorial guide.

Primer:
An LCD screen cannot produce light. It needs an additional light source.
A Backlight is the additional light source.

A Backlight is a CCFL, or a series of LED lights.
Your laptop uses a series of LED lights for the Backlight.

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

A CCFL requires a screen Inverter.
A screen Inverter converts the power from the laptop, for the Backlight, and LCD screen.

NOT all LCD screens that use LED lights as a Backlight, use a screen Inverter. I suspect yours does not, as I can't find a listing for a screen Inverter, for it.

http://www.laptopscreen.com/English/section/FAQ/1245191276/Correct%20backlight%20type%20for%20your%20new%20screen/

This would mean that if the Video Cable proves to be good, the next step is to replace the LCD screen.

Shop around for the best price, AND make sure it is a direct replacement for yours.

Regards,
joecoolvette

Feb 12, 2012 | Dell Inspiron Computers & Internet

2 Answers

Hi ! i have dell vostro 1510 and which is not booting up. even the bios is not showing up. Black screen appears and the loading lights blinks for 4-5 times then nothing happens. Power button is glowing...


- try to plug an external monitor on your laptop
- if you can see a screen on the external monitor, then you have a faulty LCD
- if you don't see anything on the external monitor, then you have a faulty motherboard

Jul 04, 2011 | Computers & Internet

2 Answers

Blank screen HP DV1000 I can get video on an external monitor though


Your laptop may have video options:
* only internal LCD screen
* only external monitor (leaving your screen "dark")
* both screens.

Try toggling through the above 3 options.

After that, there's no part in the LCD screen that you can repair, by yourself.

So, if the computer is still under warranty, contact HP to exercise the warranty.

Otherwise, take the printer to a qualified technician, for proper trouble-shooting & repair.

Dec 10, 2010 | HP Pavilion dv1000 Notebook

1 Answer

When I power on my computer my monitor screen goes a solid whitish gray. worked fine yesterday, and then today nothing.


Laptop LCD screen turned completely white
What can you do if the laptop LCD screen turned completely white? From my experience I can tell that this problem may be related to the following:
1. Loose connection between the video cable and the LCD screen.
2. Defective LCD screen.
3. Defective motherboard (I assume the graphics card is integrated into the motherboard).

When you turn on the laptop, it starts but the image on the screen is completely white right from the beginning.
Most likely you still can use the laptop with an external monitor. Just connect the monitor to the VGA port on the back or side of your laptop and then switch the video output from internal to external mode.
On Toshiba laptops you can toggle between internal and external screens using Fn+F5 keys. Hold down Fn and press on F5 until you get video on the external monitor.
On IBM laptops use Fn+F7.
On HP laptops use Fn+F4.
It’s possible that you have to use a different key combination on your laptop but you get the idea.
On some laptops, in order to be able to use the external monitor, you have to connect it to the laptop and then restart the laptop so the external monitor is detected by the laptop.
I noticed that in some cases the laptop screen may turn white because of poor connection between the video cable and the LCD screen. If you want to check this connection, you’ll have to take apart the display panel because the connector is located on the back side of the LCD screen.
I always check the video cable connection first. Reconnecting the video cable may fix your problem.
If reconnecting the video cable doesn’t help, most likely you have a problem either with the LCD screen or with the motherboard.
The best way to find out which one is causing the problem is testing the laptop with another working LCD screen. Without this test you’ll have to guess because as I mentioned before this could either bad motherboard or bad LCD screen.
You’ll have to disconnect the video cable from the LCD screen and the inverter board. After that you connect another working screen and test video.
The original screen is white but my test screen works normal and I can see the image. After this test I can tell that the problem must be related to the screen.
After I assembled everything back together and connected the original LCD, it’s still white.
CONCLUSION.
In my case this problem is related to the LCD screen and it has to be replaced.

Feb 01, 2010 | Computers & Internet

1 Answer

LCD is on...seems like backlight is not functional; when external monitor connected, boot-up and bios screen visible. After boot-up, screen goes to "power save" mode and will not return


Use the 'FN' key (blue coloured?) and one of the other blue-coloured keys to "toggle" the video:

1. LCD only
2. external monitor only
3. both LCD & external

After boot-up, Windows defaults to "LCD only", and so the external monitor goes to "sleep".

Dec 11, 2009 | Acer TravelMate 4010 Notebook

1 Answer

Vertical White Band on LCD Laptop


Your new LCD is faulty. The band on your old one is the end of it I am affraid.
Laptop LCD's although built to take a beating (or so it seems) are extremely fragile. It only take a very small drop to end their lives.

Jan 01, 2008 | Dell E171FPb 17" TFT LCD Flat Panel...

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