Question about IBM ThinkPad T40 2373 Notebook

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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

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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


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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)

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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.

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