Question about IBM ThinkPad T40 2373 Notebook

1 Answer

IBM THinkpad T40 not charging

A while ago, i made the power jack external because the wires were broken. I used like that for quite some time without ant noticeable problem. One day, i noticed that one of the wires was really hot and was not charging (I believe that i inverted the cables, brown with the white). Since then, it is not charging the battery and is not working as an AC power ? Consequently is not starting. I do not have an extra charged battery to test the computer. Is there a fuse somewhere that i blowed? thanks cesar

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.


    An expert who has answered 200 questions.


    An expert whose answer gotĀ voted for 20 times.

  • Expert
  • 238 Answers
Re: IBM THinkpad T40 not charging

Hi, since u say the wires were hot , that means -ev and +ev got shorted, that might have damaged the power supoply, or the polarity is reversed,if u can manage to open the adapter, then try replacing the fuse if present , and the filter capacitor. let me know

Posted on Jan 05, 2008

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

4 Answers

Hello my laptop t41 power is not even flash but the adapter is working,am technician and i have troubleshoot allot.

I concur with what Diegotech stated.

To iterate further;

1) The DC Power Jack (DC IN), may have cracked solder joint/s on the motherboard connector, (Female), where the DC Power Jack plugs in.


2) The DC Power Jack may be broken.
Center Pin mount, and/or body of DC Power Jack, and/or Outer Shell mount.

Replace DC Power Jack.

3) Wires from the DC Power jack plug to the female connector on the motherboard, may be bad.

Replace DC Power Jack.

Two examples, of a place to buy an IBM ThinkPad T41 DC Power Jack,



Past this point it's a bad DC sensor on the motherboard.

Replace motherboard.

IBM ThinkPad T41 Service Manual, (Free),

On this page go down to the 8th line.
The one that starts with > ThinkPad T20.

Go across, and click on > T41

Takes approximately 2 seconds to see the first page, and additional time to fully download.

Page 142 for 14.1 inch LCD screen
Page 151 for 15 inch LCD screen

(PDF file page number box at top)

Dec 01, 2010 | IBM ThinkPad T41 Notebook

1 Answer

Will not power up, tried switching batt and a/c adpt. Like the on/off button does not work

You may have a problem with the input power jack. The jack itself maybe open and does not provide power to charge the battery or power the computer. The laptop must be disassembled to check and/or repair the jack. Try getting the battery charged from another similar laptop and then see if the laptop powers up - if it does, the problem is the jack. Worst case is a bad motherboard.

Oct 28, 2010 | IBM ThinkPad T40 2373 Notebook

2 Answers

Hello, I have an IBM ThinkPad t40 and my battery will not charge. It runs on AC power but shuts off as soon as AC is removed.

You should replace the battery. I wish I had a better answer, but that's pretty straight forward.

Mar 04, 2010 | IBM ThinkPad T40 2373 Notebook

1 Answer

Probleme power ibm thinkpad t40

Check your Battery if it take charge. Then check if ever your laptop start without the battery.

Feb 15, 2010 | IBM ThinkPad T40 2373 Notebook

1 Answer

Power connector of T40 think pad loosen

if you think your adapter really works fine then you have a  motherboard issue.

May 28, 2009 | IBM ThinkPad T40 2373 Notebook

1 Answer

Power connector of T40 think pad loosen

If you can't charge the battery and you know the battery is good, hook up just the ac adapter to verify that the laptop can turn on without the battery hooked up and if your laptop turns on then you know both are good.

At that point I would say since its not charging then it could be that the dc jack has some bad solder points on the bottom of it and need to be resoldered. Sometimes if the solder goes dry and cracks just a bit if can cause the adapter not to charge the battery.

If that doesnt fix the problem the the motheboard is bad and would need to be replaced.

Apr 09, 2009 | IBM ThinkPad T40 2373 Notebook

2 Answers

IBM ThinkPad R40 No PowerUp

If the the ram is the problem of your system, there should be a power on light on the system. indicating that some of the component of the system is not working correctly. But since you mentioned there is no light, it is the possibility that the problem is the motherboard itself.

Feb 26, 2009 | IBM ThinkPad R40 2722 Notebook

1 Answer

IBM,lenovo ThinkPad R31

Maintenance manuals for both systems are on, under the publications section. But without looking at it, I would say no, the cables will not work.

Jun 09, 2008 | IBM ThinkPad R31 2656 Notebook

4 Answers

My IBM do not turn on.. IBM A21M..

check power ac adapter and batery if the batery is ok or charge do a test to the hard drive and memory ram loock on BIOS

Jan 03, 2008 | IBM ThinkPad A21m 2628 Notebook

Not finding what you are looking for?
IBM ThinkPad T40 2373 Notebook Logo

428 people viewed this question

Ask a Question

Usually answered in minutes!

Top IBM PC Laptops Experts

John mullen

Level 2 Expert

229 Answers

 Mike M
Mike M

Level 3 Expert

3320 Answers


Level 1 Expert

29 Answers

Are you an IBM PC Laptop Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides