Author Topic: Does anyone understand the information on laptop power leads?  (Read 3575 times)

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Offline Editor

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Does anyone understand the information on laptop power leads?
« on: December 09, 2009, 05:24:05 pm »
Hi,

My laptop power lead has developed a fault. I have found one off my old laptop which fits, and most of the details are the same, except one. Does anyone know whether it would be okay to use?

They are both

Input: 100-240 v ~ 1.5A19v, 1.5A, 50-60 Hz,
Output: 19V

but under 'output' the damaged cable reads 3.95A and the one that fits reads 3.16A

Will it be safe to use if the output is less?

David
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Offline Johnny Redd

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Re: Does anyone understand the information on laptop power leads?
« Reply #1 on: December 09, 2009, 06:03:32 pm »
In a nutshell....maybe

It depends what current (measured in Amps) the laptop is designed to 'draw'. The laptop will, in effect, 'ask' the adapter to supply the amount of 'juice' it requires to work succesfully and if the adapter is designed to supply this much then alls well and good. The old power lead could clearly could cope with a laptop demanding a current up to 3.95Amps and the new one up to 3.16Amps. Thats pretty close enough to try in my book but that advise comes with the usual legal disclaimers  :-\

If it can't then the worst that would happen is the adapter would be damaged, not the laptop. The opposite would be true in the case of Voltage (which is normally compared to water pressure in plumbing). If the adapter put out an excessive voltage and you connected it then the laptop wouldn't cope with the excessive 'pressure' and bish bash bosh....damage would occur.

Hope this helps  :)

 
 

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Re: Does anyone understand the information on laptop power leads?
« Reply #2 on: December 09, 2009, 06:09:49 pm »
Hi Johnny,

I think it does.  I got the figures mixed up above.

Original, damaged adapter is:

Input: 100-240v  ~ 1.5A, 50-60 Hz
Output: 19V 3.95A

My old adapter, which still works and fits is:

Input: 100-240v  ~ 1.5A, 50-60 Hz
Output: 19V 3.16A

So I guess, based on what you say, is that the replacement adapter will just not push enough power through and it will suffer, not the laptop.

Dave
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Offline Alfred the Great

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Re: Does anyone understand the information on laptop power leads?
« Reply #3 on: December 09, 2009, 09:01:02 pm »
Dave you could always look at the little sticker on the underside of the laptop which will tell you what sort of power supply it requires.
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Offline sasquartch

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Re: Does anyone understand the information on laptop power leads?
« Reply #4 on: December 10, 2009, 12:52:19 am »
It will almost certainly be OK

The only likely side effect is that it will take longer (slightly) to charge than with the original adapter

As long as the polarity is the same I wouldn't worry (ie positive on outer conductor, negative on inner conductor is usual)

Alternatively there are many cheap adapters on eBay which are, or claim to be, the original spec so that's always an alternative.
 

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Re: Does anyone understand the information on laptop power leads?
« Reply #5 on: December 10, 2009, 06:09:56 am »
Hi Sasquartch,

I looked up the part on the web. The official Toshiba distribution centre wanted 49 plus VAT and deliver - total 60. Another site offered the official part for 18 all in, next day delivery. How does that work?  Anyway, have ordered.

Thanks for all the advice.

David
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Offline Johnny Redd

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Re: Does anyone understand the information on laptop power leads?
« Reply #6 on: December 10, 2009, 08:48:30 am »
Hi again Dave,

If the old power lead could supply 3.16A and the new one 3.95A then you have no probs as far as power limits are concerned. It means the laptop would never demand more than 3.16 and the new power lead could always supply this and more so happy days..........
 

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Re: Does anyone understand the information on laptop power leads?
« Reply #7 on: December 10, 2009, 08:51:15 am »
Hi Johnny,

Thanks for that. The original power lead (which is broken) supplied 3.95A. The old one (which works) supplies 3.16A. So I guess I am fine. Just tried it and it works. However, for 18 I think a replacement is a good ideas. Nice to know I have a working spare, though.

Thanks again

Dave
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Offline Alex

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Re: Does anyone understand the information on laptop power leads?
« Reply #8 on: December 11, 2009, 11:10:04 pm »
 ???

For goodness sake all this correspondence about leads!

Go to a shop and ask and lets get into real issues!

Have a lovely (lead) Christmas
 

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Re: Does anyone understand the information on laptop power leads?
« Reply #9 on: December 12, 2009, 08:24:16 am »
Hi Alex, one of the purposes of the forum is for locals to help one another. As you will see, the title for the category the request for help was posted under was "Technology - A place to discuss IT, radio, TV, broadband and phone problems". You are welcome to post on issues more important to you.  Festive greetings to you, too.

 ;)
« Last Edit: December 12, 2009, 08:57:00 am by David Brewer »
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