Question about IBM ThinkPad T42 Notebook

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IBM t42 Display problem

Hi.
i have a IBM t42. i have some problem in thins laptop
when i switch on this laptop this lcd flick one time but display on LCD is TOO DARK but when i plug the monitor cable in the laptop external display jack. the display on monitor is normal but very Dark on LCD.
plz help me in this matter

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  • k_s_slehri Jan 13, 2009

    thnx u for ur help but
    but not useful kindly help me

  • Anonymous Mar 12, 2009

    i am also having the same problem

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Sometimes there are keys are your laptop that adjust your settings.
If you know which keys you can hit the fn key simultaneously.
If your not sure go on line and you should be able to find a site that will tell you how to adjust your screen.
In search type your laptop model then type display settings

Posted on Jan 13, 2009

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1 Answer

My IBMlaptopT42 turns on but it does not display on the screen


you must know taht musst open the display a the first or the display switch is pressed and not working any mor, try it to up with anything.

Aug 02, 2013 | IBM ThinkPad T42 Notebook

1 Answer

T42p display lights for a couple of minutes through startup then goes dark


But fan still runs, and it sounds like the harddrive is spinning?

Diagnose.

Do you have a VGA monitor available?
You can use a CRT type, (Looks like a small TV), or a flat LCD screen monitor if it has a VGA cable.

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

1) Laptop OFF, monitor OFF, connect the VGA monitor cable to the left side of the ThinkPad T42. (DisplayPort)

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

By factory default, the display should show on the external VGA monitor.
If not;

There are at least three display options available;
1) Internal monitor of laptop ONLY
2) Internal monitor of laptop AND external VGA monitor
3) External VGA monitor ONLY.

Press, and hold down on the Fn key, and at the same time tap once on the F7 key. The F7 key is the Display Toggle-Over key.

3) Good display on external monitor?
Problem is the video cable, or inside the Display Assembly.

Since the display goes dark after a couple of minutes, I can tell you the problem is the screen Inverter, or Backlight.
(Inside the Display Assembly)

90 PERCENT OF THE TIME the fault is a bad screen Inverter.

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 a series of LED's.
(Light Emitting Diode)

The Lenovo ThinkPad T42 series of Notebook PC's, uses a single CCFL for a Backlight,

http://www.screentekinc.com/IBM__ThinkPad__T42-series-laptops-lcd-screens.shtml

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.
Average length is almost as long, as the LCD screen is in height ]

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

(Older versions of backlighting that used a series of LED's, used a screen Inverter. Newer versions do not. For these replace the LCD screen)

A screen Inverter and an LCD screen are a MATCHED unit. Make sure you get the correct screen Inverter, or LCD screen, when buying.

Primer over.

One example of a screen Inverter for the T42's,

http://battery-adapter.com/product_info.php/products_id/3381/vThinkpad+T42

Pictorial guide for replacing a screen Inverter, in a ThinkPad T42 series of Notebook PC,

http://www.insidemylaptop.com/replace-screen-inverter-in-ibm-thinkpad-t40-t40p-t41-t41p-t42-t42p-laptops/

http://www.laptoprepair101.com/laptop/2007/01/31/replace-screen-inverter-fix-backlight/

Lenovo Support link to the Hardware Maintenance Manual, for the ThinkPad T42 series of Notebook PC's,
(HMM. It is a Service Manual),

http://support.lenovo.com/en_US/guides-and-manuals/default.page?

Click on the bold black subheading -
Hardware maintenance manuals
Then click on the blue -> [+] Click for files

It is a PDF file.
It may take up to 30 seconds before the first page comes up.

For additional questions please post in a Comment.
Regards,
joecoolvette

Jul 29, 2012 | Lenovo ThinkPad T42 Notebook

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BIOS locked out on IBM T40 and T42


visit this page to answer your problem. God Speed

Apr 07, 2010 | IBM ThinkPad T40 2373 Notebook

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Lcd screen stuck in external screen mode


How to use the function (Fn) keys on the keyboard - ThinkPad T40, T40p, T41, T41p, T42, T42p, T43, T43p


Switching the display output location.
Switch between the computer display and an external monitor. If an external monitor is attached, the computer output is displayed in the following three patterns by turns:
  • External monitor (CRT display)
  • Computer display and external monitor (LCD + CRT display)
  • Computer display (LCD)
Notes:
  • For any operating system other than Windows 2000 or Windows XP, no additional procedure is needed. Just press Fn+F7.
  • This function is not supported if different desktop images are displayed on the computer display and the external monitor (the Extend desktop function).
  • This function does not work while a DVD movie or a video clip is playing.
To enable this function in Windows 2000 and Windows XP, the following procedure is needed:
  1. When you log on to Windows 2000 and Windows XP for the first time, press Fn + F7 and select a display-switching function in the Initial setup window. Since in Windows 2000 and Windows XP multiple users can log on to a single operating system by using different user IDs, each user needs to select the function in the initial setup window when logging on for the first time.
  2. If the Fn + F7 key combination have been assigned to a presentation scheme function, start Presentation Director, and change the settings.

Feb 28, 2010 | IBM ThinkPad T41 Notebook

1 Answer

On screen display of volumn keys on IBM T42


check it on the IBM site for the programme

Sep 03, 2009 | IBM ThinkPad T42 Notebook

1 Answer

IBM T42 laptop...NO Video, laptop powers up however fan spins however...ideas???


Connect the laptop to an external monitor, you may have to hold down the Function key and press the F8 or F7 CRT/LCD key to switch between monitor and display, to see if the video card is defective.
I hope this helps solve your problem.
Good Luck.

Jan 21, 2009 | IBM ThinkPad T42 Notebook

1 Answer

Screen Don't Comes On Anymore


Have you tried plugging an external monitor into the VGA connector on the back? This would narrow down the problem to either the video card/motherboard or the LCD display itself.

There are several possible defects- as above, the display, motherboard component, video section.

Also, first check the LCD/CRT switching function. On many laptops, there is a function (FN) key which is pressed at the same time as one of the number/function keys (the uppermost row of keys), and this combo will switch display from LCD to CRT & both.

Feb 28, 2008 | IBM ThinkPad T42 Notebook

1 Answer

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This must be a loose connection on the lcd behind the lid or in the hinge, I would not atempt a repair, laptops are a nightmare, take to a specialist repairer.

Nov 27, 2006 | IBM ThinkPad T42 Notebook

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