Question about IBM ThinkPad T40 2373 Notebook

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Thinkpad T40 will not turn on if the adapter is connected but it will work fine with battery and without power connected. this is happening because by mistake some water was spilled on it, is there any work around to resolve this problem

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Re: Thinkpad T40 will not turn on if the adapter is...

Yes. One possibility exists for you:

If the PSU (whatt you call adapter) has an internal fuse, you can HOPE it burned BEFORE any critical PSU components.


2 Open the PSU, and look for one (or more) glass tubes located somewhere on the board. The fuse will be about .5cm (1/4 inch) in diamiter, and have metal caps on each end. (Looks like a small glass pipe bomb :)

3 If the tube is black inside or has dusty material visible, it is most likely blown, and you may be saved.

4 Regardless, remove any/all fuses by prying one end up (or desoldering, if it is soldered) and take the fuse(s) out.

4 If you know what a VTVM is (and have one) check the "continuity" of the fuse(s). The continuity should be ZERO Ohms, on any (or best, the lowest) Ohm scale. If it is null (or no continuity) then the fuse is blown. If this does not make sense, take the fuse to a radio or TV repair shop and have them check.

5. If the fuse was bad, replace it (clean receptacles with fine sandpaper if they are black/burned/dusty, and VACUUM any metal particles away) and reassemble PSU.

6. PnP (Plug in and Pray) Wish you luck! Let me know!

Posted on Dec 14, 2007

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Re: Thinkpad T40 will not turn on if the adapter is...

This is my 2nd try to post this ('fixya' needs somebody to fixIT)
This web site
talks about your problem, and the solution, which requires a new fuse, new MOSFET, and the ability to solder itty ***** solder pads!

Posted on Feb 16, 2010

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It's not necessarily hardware related, can you boot into Bios? If you can try to boot info safe mode, that's F8 for most PCs. I would suspect something with your motherboard drivers, then again it could just be your battery. Not all laptops will operate with the battery out, there is some kind of failsafe to prevent overheating in some, because without a battery the power supply can be fried sometimes.

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