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AC-DC supply voltage limit

T4x series specific matters only
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Mac-Chatter
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AC-DC supply voltage limit

#1 Post by Mac-Chatter » Fri Nov 24, 2017 3:45 pm

IBM Thinkpad AC-DC supply has an output of 15,6V according to the imprint. Most Laptops AC-DC converters deliver 19V. Does the T4x or more precise the T41 electronic can handle a 19V DC input? Does anybody accidentially plugged in 19V DC ?

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ajkula66
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Re: AC-DC supply voltage limit

#2 Post by ajkula66 » Fri Nov 24, 2017 4:02 pm

Mac-Chatter wrote:
Fri Nov 24, 2017 3:45 pm
IBM Thinkpad AC-DC supply has an output of 15,6V according to the imprint.
It's actually 16V given what's written on the adapter itself.
Most Laptops AC-DC converters deliver 19V. Does the T4x or more precise the T41 electronic can handle a 19V DC input? Does anybody accidentially plugged in 19V DC ?

Thanks, Mac-Chatter
I wouldn't play with a 19V current on a pre-T6x ThinkPad. There are genuine AC/DC adapters out there in 72W format that will work wonders if one needs to travel with a T4x or most of other older ThinkPads in general.
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Re: AC-DC supply voltage limit

#3 Post by geka3250 » Fri Nov 24, 2017 4:27 pm

It can work with 19V adapter. But I highly recommend don't do that!
On my experience I had TP390E powered from 19V - no problems, but TP600 didn't survive - blown up charger detection circuit(battery charging gone, solved by resoldering burnt LM324 chip).
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