Question about IBM ThinkPad T43 Notebook

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IBM T43 Screen Turns OFF After Removing Charger Cable


My IBM T43s screen goes blank if i remove the charger cable from the notebook. I have to restart the notebook with the cable connected to my notebook to continue my work. I have also tried by chaning battery/AC power settings but it did not resolve the issue.

Thanks in advance

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  • matkop Mar 05, 2009

    Hello there
    I have just experience the same problem, I have mu IBM t43 (2686) for three years right now and suddenly it happened.
    I hope that this is not something obvious like motherboard or screen (no problems which would suggest such problems so far). I may by also inverter. The only think that make me wonder is why this situation happens only with the battery.
    Off note is that I recently replaced the battery (got new one from lenovo) because my old one kept me on only for 30 minutes.

    I bought this laptop because of its reliability so I pray to have it work, I can not afford a new one.
    I appreciate any help.



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Sounds like a bad battery to me. If you have a DC voltmeter you can check the battery.

Posted on Feb 23, 2009


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I have an ibm t43 and the top of the screen is glitching to where it has white lines on it. How do i fix it?

Problem may be;

1) Video Cable:

A) May have a loose connection on the motherboard side, or back of LCD screen side.

B) May be damaged.

2) Display Assembly:

Specifically the screen Inverter, or LCD screen.

An LCD screen does not produce light.

It needs an additional light source.
A Backlight is the additional light source.

A Backlight (Present technology) can be a CCFL, (Or dual CCFL's), or a series of LED lights.

The IBM T43 series of Notebook PC's uses a single CCFL.

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

(Average size of bulb is;
1) Width: 2mm. {Slightly more than 1/16th of an Inch }
2) Length: A little shorter than the LCD screen is in height.

Basic example, )

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

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

Primer over.

Example of Inverter,

The thin plastic 'frame' in front of your LCD screen, is the LCD Bezel.

(Goes by several names, depends on manufacturer.
Display Bezel, Display Panel Bezel, LCD Bezel, LCD Front Bezel, etc.)

Behind it, and located at the bottom of the LCD screen, is the Inverter.

IBM ThinkPad T43 series of Notebook PC > Service Manual (Free),

Go down to the line that begins with ThinkPad T20. (T20 in blue)
Scroll across, click on - T43

[ This is a PDF file. The computer you are using now has Adobe Reader on it, which uses PDF files.

After you click on the file name { T43 } it may take up to 30 seconds, before the first page comes up ]

A) ALL power removed. Remove the AC adapter (Charger) and Battery.

B) It would be BEST, if you would wear an ESD wrist strap. Have it's alligator clip connected to a good ground source.
(Electro Static Discharge)

Average price of an ESD wrist strap is $3 to $6.
One example,

C) Use a multi-compartment container for the various screws you will remove.
Label each compartment for the area the screw/s come out of.

SOME screws look VERY similar to other screws. Do NOT mix them up.

1) Check the connection of the Video Cable TO the motherboard, and TO the back of the LCD screen.

The connection MAY look to be plugged in tightly, but in reality it is not.
Physically make sure the cable is plugged in tightly.
(Especially at back of LCD screen )

You have to remove the Display Assembly from the laptop, in order to properly access the video cable connection, at the back of the LCD screen,

PDF file page number, and service manual actual page number, Do Not match. When I refer to a page, the reference will be to the PDF file page number.

Go to Page 121 in the Service Manual, for units that have a 14.1 Inch LCD screen.
Page 126 for 15 Inch.

Motherboard Connection:
Laptop open, looking at the LCD screen; The cables on the Left are Video. The cables on the right are for the Wireless Antenna.

LCD screen connection:
Disassembly of LCD Assembly starts on Page 154.
Page 167 shows the video cable, and connection.
LCD flat panel cable = FPC. Also known as Video Cable.

On Page 121 you will see a component removal list, listed in order of removal.
You can click on an underlined subject, to go directly to the chapter that deals with it

To remove the LCD Assembly, (Display Assembly), you have to
remove the Keyboard, then Keyboard Bezel. (Palm Rest)

Once the Keyboard Bezel is removed you have direct access to the motherboard connection side, of the LCD cable. (Video Cable, or for IBM - FPC)

Check the connection. Tight or loose, you still have to check the connection at the back of the LCD screen. (LCD Panel)

1a) Check for damage to the LCD cable.
If there is obvious damage to the outside sheath of the cable, there may be damage to the tiny wires inside the cable.

Even if there isn't obvious signs of damage, the tiny wires inside may be stretched/broken.

Use a multimeter set to Ohms, and check the continuity of the wires, inside the LCD cable.
{ An economical, yet good enough for this test multimeter, can be purchased for as little as $8 to $12. Available in a multitude of stores. An auto parts store is but one example. Analog or digital is fine }

2) LCD cable checks out it's on to the screen Inverter.
Make sure this small circuit board isn't damaged. (Pulled wire/s)

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

Something the average consumer does not have.
For this reason, the ease of accessing it to replace, and the usual low cost, (Compare to an LCD screen), the unit is usually just replaced.

Parts changing I know, but you have to use what is available to you.

Or see what a computer repair shop will charge to test the unit.

An LCD screen, and a screen Inverter are a MATCHED unit!
When replacing make SURE you get the right part ]

3) Screen Inverter checks out it's a bad LCD screen.

NO, your graphics chipset is FINE.

For additional questions, or clarifications, please post in a Comment.


Apr 27, 2012 | IBM ThinkPad T43 Notebook

1 Answer

My IBM T41 make beep sound and turns off itself. What is happening?

You can try the steps below.
Try removing the battery and plugin the charger and try turning on.
Do you see any thing displayed on your screen when you switch on?
Please mention the beep pattern, 2 beeps or continuous beep.
Hope this helps. Good Luck

Aug 24, 2011 | IBM ThinkPad T41 Notebook

1 Answer

Nuvi 255w Turns off (screen goes to black) after a few seconds to a few minutes. No consistency on amount of time. "Turn Off" may be incorrect - screen goes blank/black Sometimes i can immediately turn it...

I have a Garmin 255 myself. And what I have found is, MOST of the time, the problem is that the CHARGER CABLE has an intermittent connection in it! So, when the cable moves, flexes, or stretches, the battery charge STOPS, and the (mostly discharged) battery cannot support the load, so the unit blacks out and turns off. Try S-L-O-W-L-Y moving the cable while connected with the unit on, and watch for evidence of a bad cable! Sometimes a DIRTY (trapezoid- shaped) connector will do the same thing!

May 11, 2017 | Garmin nuvi 255W GPS Receiver

1 Answer

I have a T42 IBM laptop, and its screen turns black whenever I remove the charger. Why?

bad battery.
keep using charger at all time before you use a new battery.
good luck.

Nov 26, 2009 | Acer Aspire 4520-5582 Notebook

1 Answer

Ibm thinkpad t43 backlight inverter issue

Did you say the the video output flickers on and off when you connect an external monitor to the video output. If the inverter is faulty this would not affect the video output and the external monitor would not flicker but if the external monitor flickers it would point to a video card problem.

Jun 13, 2009 | IBM ThinkPad T43 Notebook

2 Answers

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Try removing and reseating your CPU, video cable and or memory. If nothing stills hapens, your video card or chip may have gone bad. Please let me know if this works.

Dec 13, 2008 | IBM ThinkPad T43 Notebook

4 Answers

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Hi all,

I had simmilar problems ie screen ok when closed but fuzzy when slid open, screen going blank etc.

I replaced the flex cable that connects the screen to the main board and the phone now works perfectly.


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the backlight or fuses are dead. Do not bypass fuses or you'll kill your system.

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