Thinkpad T23 doesn't charge battery

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My Thinkpad T23 is not charging battery at all. Battery is tested with
other machine and it is OK.

Battery led is burning at yellow and it looks like it is charging but
nothing happens. Battery MaxiMiser shows also that battery is under
charging but Current field is totally empty, 0.00A.

If I put charged battery on it, I can use the machine without AC.

Is there some kind of circuit burned or what? Is there any other
solutions to fix the problem except for change motherboard? Warranty
has ended a few months ago.

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