Question about IBM ThinkPad T40 2373 Notebook

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Display cuts off. Shutdown computer and it comes back.

My display will go dark. I can turn it off for a few minutes and it comes back. I have connected it to an external monitor and it works fine so the video card is probably OK. Can anyone help me?

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  • Tom Toliver Mar 13, 2009

    hvpatel had exactly the answer. I disassembled the display (my first time) got the part number, bought one on ebay for $12.29 including shipping, have just put it in and reassembled the display and it works like new. Many thanks.



    Cutterx

  • Anonymous Mar 19, 2009

    My IBM T40 2373 has developed two issues. If I have the unit in my lap and the laptop flexes at all, the LCD screen will go on and off as I apply pressure to the body of the laptop. The second problem which just developed is the laptop works just fine until I move it and as soon as I move it at all, the unit freezes and must be rebooted to get it working again. It is suddenly exceptionally sensitive to movment.

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Your lcd inverter circuit fail

replace ccfl bulb inverter pcb

you can buy it from market with part number

Posted on Mar 10, 2009

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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

My dell inspiron laptop 1000 screen turns dark every few seconds. if I close the computer half way and open it,it stay bright for a few seconds and turns dark again


This is your back light on your lcd display, To prove that have a flash light handy when it goes dark point the flash light at the screen and you should see the screen and that would mean right there you got a back light going out or the inverter that powers it is going bad. Etherway if this is not your area of work you need to tech it to a computer tech local to have it repaired.

Thanks for being considerate with your ratings and feedback today.

May 04, 2010 | Dell Inspiron 1525 Notebook

1 Answer

Intermitently, my screen goes dark, but the


1.)It could be your video card
2.) Yes it is expensive for a laptop
3.)I would first check your screen setting for turning off display...

If you are using vista:

-Right click on your desktop then choose personalize
-Then click screensaver
-On bottom click on "change power settings..."
- On the left click on "choose when to turn off the display"

Your monitor can turn off without your computer being in sleep mode.

Dec 26, 2009 | Toshiba Satellite A105-S4334 Notebook

1 Answer

The screen goes very dark within a minute after booting up = I can just barely see the menu page


When you say screen goes very dark when it booted to windows so it means that when you turned on the laptop when the dell logo flashes the screen was fine? if thats the case could you please try this. after turning on the laptop you will see the dell logo flashes immediately keep tapping on F2 and then it will show you the BIOS setup utility, please check if in BIOS setup display goes dark as well. If yes then try this, after turning on the computer when dell logo flashes keep tapping on F12 to boot menu then select utility partition to run the diagnostics. Please run test on the LCD check if display goes black when running the LCD test. Then try this when you sees the dell logo keep tapping on F8 to boot in safe mode check if in safe mode display goes very dark. Try this too, boot in F8 then select last known good configuration check if the settings on your display will be fix. If you can boot to safe mode no problem then uninstall the display or video driver. then restart computer.
You can also try to connect an external monitor if you have one just try to isolate if issue is on the LCD or the video card. If the display is dark as well in external monitor then video card needs to be reseated if fails then replaced. In situation like this most video cards is integrated to the motherboards. So replace motherboard.

Dec 08, 2009 | Dell Inspiron 2200 Notebook

2 Answers

Loss of light on screen Dell Inspiron E1705


Check your backlight settings, Power Settings, etc.....

You may have Vista (vista has other power settings such as a custom sleep mode which can fail sometimes to work properly with some hardware/monitor configurations).
So Disable any unconventional Hibrid Hibernation options k!

Apr 20, 2009 | Dell Inspiron E1705, Intel Core 2 Duo...

1 Answer

IBM T40 2373 display cuts off.


When it cuts out can you still see the display very faintly or does it just go completely black?

Mar 10, 2009 | IBM ThinkPad T40 2373 Notebook

1 Answer

HP Pavilion dv4000 display dies b4 it even boots


When you get to the normal/safe mode screen, select enable VGA. This will boot your computer using the standard 640 x 480 default. Once you are in windows, then you can go into the display properties and change it to a resolution that is compatible with your screen and computer.

Thanks and pelase take a moment to rate as fixya.

Nov 08, 2008 | HP Pavilion dv4000 Notebook

1 Answer

HP Pavilion, Screen working, but extremely dark!


Hi,
As per your description, I find that the issue is with the LCD Backlight which is also called as LCD Inverter which lights up the LCD to show us the Display on the LCD Display.
If this Backlight is gone bad, you will be barely able to see the Display on the LCD.
Coming to the Noise you had mentioned above can be from the Cooling fans of the Notebook which will be spinning at high speed when the Notebook starts and will reduce gradually after few minutes.
I recommend you to try cleaning the Cooling fan vents using any Vacuum Cleaner or Air Blower.
I recommend you to contact any nearest HP Authorized Service Center and get the LCD Backlight replaced.
Hope this helps....

Jul 21, 2008 | HP Pavilion dv6000z Notebook

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