X41T thinks it is always charging when it is not

[Bibin]

A friend of mine has an X41 Tablet, and regardless of whether or not the AC cord is attached it thinks it is charging the battery.

When the cord is attached, it DOES indeed charge the battery and say so.

When the cord is removed, it runs on battery just fine (tried 3 different ones!) however it still thinks it is charging.

When the machine is shut off, the battery light stays lit and it thinks it is charging (in reality probably it is discharging)

Does anyone know what to do?

[Harryc]

It's normal for the battery light to remain on when the machine is powered off, if the AC adapter is plugged in. What makes you think it is charging with the AC adapter removed?

[Bibin]

When the AC adapter is removed, the battery light is always on. Even if the laptop is off.

When I unplug/plug it, it makes no beep sound as usual, even though the BIOS option does not change. The little battery icon always shows the plug with blue lightning bolt icon, and the screen brightness does not change. The power manager utility says "time until fully charged" and says the battery state is charging. This is all without the power plugged in.

I'm quite sure it thinks it is charging. It certainly is not, but it believes it is.

[Harryc]

You've stumped me on this one. Maybe somebody else has seen this. I know I have never seen a Thinkpad that keeps the battery charge light lit if unplugged and powered off. Standby yes..powered off no.

[Bibin]

For whatever reason, taking apart the laptop, probing with a multimeter the fuse to check if it's blown (it wasn't) and reassembling it seems to have fixed it.

[fraggy]

As the friend of Bibin's with the thinkpad, I confirm this result. My Thinkpad X41t is now fully functional. It was opened today by Bibin, and he poked around with a multimeter in the area of the power circuit, and concluded that apparently nothing is wrong. When closed, thinkpad stopped thinking it's constantly charging. Thanks man.

[yozas]

Hello, I am quite sure that the problem was with an embedded controller, it's program got "stuck", hung, whatever you want to call it
The "fix" that probably helped was pulling out the battery, it restarted the controller.