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Thinkpad power jack
Posted: Mon Apr 22, 2013 9:45 pm
by MikeCL
A bit confused.. I assume the center pin is (+) and the barrel is (-) for testing purposes shouldn't the T400 be charging? The charger came from an HP it's output is 18V
Does the thinkpad have some type of hidden special pin?
Re: Thinkpad power jack
Posted: Mon Apr 22, 2013 9:48 pm
by ajkula66
I'd strongly advise against using a non-ThinkPad AC adapter with a ThinkPad...
Re: Thinkpad power jack
Posted: Mon Apr 22, 2013 10:11 pm
by MikeCL
Yeah I know
turns out I was looking at the pinout wrong
it's charging right now and I'm sure a full charge with it off will be around 4 hours or so, but I'm not going to wait that long since I have to head out for work in about 2 hours.
Re: Thinkpad power jack
Posted: Mon Apr 22, 2013 11:40 pm
by emeraldgirl08
ajkula66 wrote:I'd strongly advise against using a non-ThinkPad AC adapter with a ThinkPad...
I second this ^^^
Re: Thinkpad power jack
Posted: Tue Apr 23, 2013 3:53 am
by rkawakami
FYI:
http://www.kawakami-ca.com/images/20v_dc_plug.jpg
It's been documented that there's several different resistances being used, depending upon the wattage of the power supply:
http://forum.thinkpads.com/viewtopic.ph ... 44#p682644
Re: Thinkpad power jack
Posted: Tue Apr 23, 2013 9:38 am
by MikeCL
If you really want to know what I did in a desperate measure to charge it I found the pins I needed on the jack, as I don't have the right jack size I did enough to get the battery fully charged in which I get a little over 3 hours on the 6 cell pack, not sure if that's good or not.
So I got to test the laptop running off the battery installing windows 7 on the SSD and it still has great life left.
