Using a 56W adapter for T43p?

[CoolDragon]

There is no suitable machine type listed on the official site:
http://www-131.ibm.com/webapp/wcs/store ... d=10000001

I know if you use the 56W adapter to run the T43p AND charging the battery AT THE SAME TIME, it will cause the adapter overheat and may even cause your laptop's internal circuit damaged.

But, what if I ONLY use it to RUN the computer?

56W/16V = 3.5A

The question is: where can I find out the UPPER LIMIT ampere to run my machine?

[pphilipko]

No. It will not work. You will need a 72w adapter.

[JHEM]

Much as I hate to disagree with Phil, yes it will work.

However, I am moved to ask why you'd do so?

Regards,

James

[CoolDragon]

Well, I think it all depends on how much current (in Ampere) the T43p will draw at most (without charging the battery at the same time), as long as that is clear, it is easy to know if the 56W adapter will work in the worst case. The [censored] thing is that there is no such spec from IBM/Lenovo.

The only reason I asked this is that I have an extra 56W adapter from my previous X30 machine.

[blackomegax]

it will work. an idle T series will draw only 9-12 watts. charging will max out the draw though and might actually warm it up considerably.

but it wont be harmed.

same goes for using a 72watt on an X40. itll only draw what it needs.

[w0qj]

Just sharing my own (bad) experience, for what it's worth:
my 5-mth-old 7K60 HDD broke prematurely... and likely to be caused by below usage:

http://forum.thinkpads.com/viewtopic.ph ... 25f9080973

> Your 56W power adapter may work, but if you consistently over use it,
> it may fail prematurely.
>
> my compter is:
> T42s 2373-K5H
> 1 GB RAM
> 7K60 Hitachi Travelstar HDD
> 1.7 GHz Intel Pentium M (Somana with 2 MB cache)
>
>
> This past 6 mths, I've been using my old IBM Thinkpad 560's power
> adapter (35W, 2.2A, Part No. 12J1443) with no apparent ill effect on
> above computer for occasional use (secondary power supply for
> limited use at home).
> Check emails, type up misc. office document, excel use, etc.
> Just light use...
>
>
> BUT just last week, i used my T42s very heavily for an entire day
> (burn my CD's into MP3, while doing MP3 edits of my tapes at the
> same time (all personal materials), and charging my 6-cell battery
> at the same time.
>
> At the end of the day, this old power adapter nearly failed
> (overheat, started to have a burning smell--i disconnected it
> immediatedly), possibly due to power over-draw (RAM, CPU,
> HDD, CD-ROM, battery recharging all in use constantly for
> while day).

[MobileGuru]

The adapter will power the machine .. but charging time will be horrid while it is up and running, and you will get flicker from the screen at a full brightness setting if you are doing anything energy intensive. In a pinch, you can operate the machine (remember yellow plug fits yellow hole) but in the long run you do risk physical damage over time.

N.

[Kyocera]

Slight underamping is bad and overamping is bad too. Voltage fluctuation either way is bad, same with wattage, laptop power supplies are tiny and stress easily. Larger machines with larger power supplies will take more power fluctuations, but then there is that one day when it just quits, or starts acting weird. In my job I have to troubleshoot power supplies, 90% of the problems come from bad AC line voltage. Amperage drops, voltage drops, surges etc. A power supply is the only protection circuit you have between the AC wall (which should never be considered clean) and the DC in to the machine power supply. If the DC power going in to your machine is not matched with your machine power supply it is russian roulette. Would not consider using an adapter not exactly specified for my machine, ie. volts, amps, watts, plug pinout +Pos tip -Neg sleeve.