Question about Compaq Presario 2100T Notebook

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Screen blank when fully open.

When I open my laptop fully, nothing shows on the screen. When the cover is open 3 - 4 inches, my screen fully displays. Tried pushing small button under corner of laptop, no change. Removed cover and no visible breaks in any wiring. Anybody have this happen or have some suggestions where to check further?

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Screen blank


Post the manufacturer and model number of the laptop. Model number is located on the bottom of the computer. In the meantime I can only give you a generic diagnosis to follow;

1) Laptop OFF, monitor OFF, connect a VGA monitor to the VGA port on the laptop.

This is an example of a VGA Cable, and VGA connector, (Port),

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

(On the laptop near the VGA port it may have RGB, or External VGA, or nothing )

You can use a CRT type of monitor, (Looks like a small TV), or a flat LCD screen monitor that has a VGA cable attached.

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

By factory default settings, the display should show on the external VGA monitor.

IF not; Hold down on the Fn key, and at the same time tap once on the Display Toggle-Over key.

The Display Toggle-Over key will be one of the F keys at the top of the keyboard. (F1 through F12)
HP laptops for example, usually use the F4 key.

After performing the above, there is no display on the external VGA monitor;

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 Display Toggle-Over key.

NO display shows on the external VGA monitor?
You have a bad graphics chipset, or the mounting of it to the motherboard is bad.

Display shows on external VGA monitor?
You have a problem with the Video Cable, or in the Display Assembly itself.

A) Video Cable:
This cable connects to the motherboard, under the Keyboard area, or just above it.
It then goes along, and up under the left Hinge.

From there it goes up into the Display Assembly, and connects to the back of the LCD screen.
There is also another wire, or two, that comes from the Video Cable, and connects to the screen Inverter

Primer:

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

A Backlight can be a CCFL, (Or two of them), or a series of LED lights.
(These two technologies are used in the present )

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

[ Average size is 2mm Thick, and the length is almost as long as the LCD screen is in height.

2mm is a little larger than 1/16th of an Inch.
More information on CCFL, and general guide to replacing,

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

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

90 PERCENT OF THE TIME the fault can be attributed to a bad screen Inverter.

Some average examples of a screen Inverter used in a laptop,

http://www.laptopparts101.com/screen-inverter-board/

The thin plastic 'frame' in front of the LCD screen, is a Display Bezel. Has many names, depends on the manufacturer.

The screen Inverter is located behind the Display Bezel, and mounted at the bottom of the LCD screen. (Usually)

Primer over.

Check the video cable connection on the motherboard side, and at the back of the LCD screen.

Just with opening, and closing the laptop, the video cable could have been pinched in the Hinge.
This would lead to the video cable being pulled on, and pulling a connection loose. (Or both connections)

It could also lead to damage of the video cable.
Check the cable's outside sheath for obvious signs of damage.
This may indicate damage to the tiny wires inside.
(Stretched/broken)

It is best to completely remove the video cable, and with a multimeter check the wires inside for continuity. (Set the Function knob to Ohms)

B) Display Assembly:

The Display Assembly consists of the;
1) Display Bezel
2) Display Cover. (Top cover of laptop over LCD screen )
3) LCD screen
4) Hinge brackets, and Hinges
5) screen Inverter
6) Backlighting
7) Web camera (IF installed)
8) Microphone (IF installed in Display Assembly )
9) Screen Frame (Holds the LCD screen assembly together )

If the Video Cable checks out OK, move on to the screen Inverter.
Look to see if the cable (Wires) connections to the screen Inverter are tight.
Physically check, do not assume by just looking.

Is there any obvious signs of damage to the screen Inverter?

To test a screen Inverter requires a sensitive multimeter. Read fairly expensive,

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

Due to the fact;
1) That most do not have a multimeter of this type around,
2) The ease of accessing to replace a screen Inverter,
3) The usually low cost of the screen Inverter,

, the screen Inverter is replaced. Parts changing I know, but you have to use what is available to you.

Replaced screen Inverter, and you still have no display on the laptop's internal monitor?
Replace the LCD screen.

Note*
If a laptop uses CCFL for Backlighting, there is going to be a screen Inverter.
If a laptop uses a series of LED lights for a Backlight, there MAY, or MAY NOT be a screen Inverter.

In this case the LCD screen itself is replaced.

If you post the laptop manufacturer, and Model Number, (In a Comment), I may be able to link you a Service Manual. Also there may be pictorials with disassembly information.

Guide you as if I was sitting next to you.

Regards,
joecoolvette

Apr 28, 2012 | Computers & Internet

2 Answers

My laptop wont show screen display


Losing the display on a laptop or notebook computer is a perplexing and frustrating problem. It's a problem that is somewhat difficult to diagnose, and can require specialized tools and a considerable financial outlay to repair. When the display on a laptop computer stops working, the computer is usually not worth the investment to repair.

1.Diagnose the problem with your computer. Watch the screen from the moment you hit the power button through the time it should take to boot into the Operating System.
Adjust the computer's contrast and brightness through their full ranges to make sure that the display settings have not been changed.
Reset the computer's LCD-External Monitor display with the LCD/External Monitor key combination and reboot the computer.
Continue to Step 2 if the screen is blank throughout the booting process.

2.Adjust the screen from its fully closed position to its fully opened position. Watch the monitor for any change from a blank screen to a display or vice-versa. If the screen flashes or cuts out, the LCD panel will need to be replaced. Skip to Step 5.

3.Skip this step if your computer does not have an external monitor output.
Connect your computer's external monitor output to a known good monitor and change the display from LCD to External Monitor (the keystroke combination is different for all notebook brands). Reboot the comptuer, if necessary.
If the computer does not display to the external monitor, the video card could be bad. Skip to Step 6.

4.Consult with a professional technician to determine the cost-effectiveness of replacing your computer's LCD if you are not knowledgeable in that area.
Purchase a compatible replacement LCD and install it yourself, or pay a professional technician to do so if you do not feel comfortable performing the repair.

5.Verify that the monitor connection cables are not loose or disconnected before attempting to replace it.
Replace the monitor yourself by removing the old monitor. Remove the hinge covers by gently prying them. Check if they are screwed to the computer before prying.
Find the monitor cable's connection to the motherboard. Turn your computer over and remove any plates that may cover the point of connection. Note the orientation of the cables before disconnecting them.
Unscrew the monitor from the hinges and gently detach it from your computer. Feed the new LCD panel's wires through the same path as the old wires, and reconnect them. Secure the new LCD's hinges and replace the hinge covers.
Power up the computer and check that it works. If it does not, recheck the wire connections.

6.Consult with a professional technician to determine the cost-effectiveness of replacing your computer's motherboard or video card if you are not knowledgeable in that area.
Purchase a compatible replacement motherboard or video card, and install yourself or pay a professional technician to do so if you do not feel comfortable performing the repair.

7.Replace the motherboard by disassembling the computer. Document every connection and be sure to retain all screws and small parts in order to reassemble the computer correctly. Reassemble the computer and power it up; check the keyboard to make sure that it has been reconnected properly.
Replace the video card by removing any covers or plates that hide the card. Remove the old card and install the new card in its place. Power up the computer to test the display.

Sep 09, 2011 | Computers & Internet

1 Answer

This message appears on the screen after the ASUS screen. Then nothing. Help


In Most cases if a screen can display and shows signs that your laptop was loading then shows nothing later many times your windows may be corrupt or damaged so you will need to re-install windows on your laptop....i would recommend windows xp 2 and just after installing please try installing an anti virus immediately before any other program is added and don't forget to update the anti virus first. Please also give more information on what kind of message appears before the screen goes blank.

Apr 13, 2011 | Computers & Internet

1 Answer

Display shows a blank area in the right lower corner, of around 2 to 3 inches


You have dead pixels on your screen. You will have to replace it. I suggest you give it to Dell Service Centre.

Nov 18, 2010 | Dell Latitude D610 Notebook

1 Answer

My lab top when restarted it beats 3 times, screen blank


Nothing to worry, Open your laptop from the back side.Remove the RAM  and reinsert it.

Your system will work fine.

Rate this solution.

Dec 27, 2009 | HP Pavilion dv9700t Notebook PC

1 Answer

No display in Acer aspire 4520g laptop


Have your laptop check up the technician, it has somethingt to do with your video card

Nov 05, 2009 | Acer Aspire 4520-5582 Notebook

2 Answers

Black Screen


Have you tried cycling all the way through the options with the F4? Most laptops toggle in a manner similar to: 1) Laptop only, 2) External display only, 3) Both displays, 4) Back to Laptop only (cycle repeats).

Jun 28, 2009 | Toshiba Satellite L300D-ST3501 Notebook

1 Answer

Blank screen during POST and vista startup


The screen is going bad. Take it to a reputable repair person for a a electronics check out.

Mar 26, 2009 | HP Pavilion dv1000 Notebook

2 Answers

Asus laptop - screen went blank and will not turn back on


I'm assuming your screen shows nothing at all, even the bios or boot screen as it turns on.

If you can hook it up to an external monitor then your video adapter is working. Try using the vga output on the laptop. If it doesn't show anything use you display select feature. I'm not sure what button it is on your laptop but on mine it is Fn+F8 (look for a button that shows a laptop and/or a rectangle).

If you can see it with an external monitor, you should try to uninstall and reinstall the video adapter. After you reboot the computer hopefully it will work.

However, if it still does not work, you will probably need to reseat the monitor cable. Do this by opening the screen panel. on the back is a flat cable tat plugs in to the LCD. This is usually covered by tape. Carefully remove the tape, unplug the cable and plug the cable back in. Don't forget to replace the tape!
I have fixed two computers in the last two weeks by reseating this cable.

Hope this helps and good luck!

Jan 10, 2009 | ASUS A8Jm Notebook

1 Answer

Blank screen


Quite possible that the machine is defaulting to external display only. Check your BIOS for this and try any function keys/switches that are available.

Sep 10, 2008 | Gateway MX3414 Notebook

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