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T420s 65W adapter, Power Manager showing 90W?

T400/T410/T420 and T500/T510/T520 Series
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dyst0pia
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T420s 65W adapter, Power Manager showing 90W?

#1 Post by dyst0pia » Wed Aug 22, 2012 2:12 pm

My 65W adapter gets incredibly hot during charging, and I think it may have something to do with my machine thinking it's a 90W adapter. In the Power Manager application, on the Battery tab, it says "90W AC adapter is attached." Is there some way to fix this? Or do I need to replace the adapter?

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Re: T420s 65W adapter, Power Manager showing 90W?

#2 Post by BillMorrow » Wed Aug 22, 2012 5:47 pm

good question..
if you have another adapter available, try it and see what the thinkpad reports..
if it reports the correct adapter, then replace the other adapter as defective..
if it reports the wrong adapter then IMO the thinkpad needs to have warranty service done on it..

be sure to reboot to see if this might be a software issue..
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automobus
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Re: T420s 65W adapter, Power Manager showing 90W?

#3 Post by automobus » Thu Aug 23, 2012 1:51 am

The signal (on centre pin) is broken, inside the plug, impossible to detect by eye. Sixty-five watt supply has a resistor inside, ninety has not. So, without signal, any adapter is sensed as ninety watt.

Further reading if you are curious:
http://forum.thinkpads.com/viewtopic.ph ... 44#p682644

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Re: T420s 65W adapter, Power Manager showing 90W?

#4 Post by BillMorrow » Thu Aug 23, 2012 2:17 am

very good work mr. err. . .pada..
now i learn something.. :)
Bill Morrow, kept by parrots :parrot: & cockatoos
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She was not what you would call refined,
She was not what you would call unrefined,
She was the type of person who kept a parrot.
~~~Mark Twain~~~

dyst0pia
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Joined: Wed Aug 22, 2012 2:09 pm
Location: Boston, MA

Re: T420s 65W adapter, Power Manager showing 90W?

#5 Post by dyst0pia » Thu Aug 23, 2012 2:20 am

Thanks for the info. I can't believe someone actually went and figured all of this out :o

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