New AC-adaptor for notebook

By lopdog
Jul 3, 2008
  1. Hi!

    My laptop AC-adaptor stopped working. It's output was 19V and 4.74A (~90W). I have one from another computer, also 19V but only 3.95A. Could I use this adaptor?

    Someone have told me that I should get an AC-adaptor with same or HIGHER value, and another person told me that if it has higher power the computer could stop working, and that I should get one with same or LOWER value. What's the truth? And why...

    Thank you
  2. kimsland

    kimsland Ex-TechSpotter Posts: 14,524

    The voltage is consistant, the Ampage is "drawn" (pulled)
    On a 3.95A, the laptop may not start, and can hurt the adaptor (and possibly the laptop trying to pull more amps)
    On a 4.74A (the correct ampage) the laptop will draw the correct ampage
    On a 5+ A (above the correct ampage) if it still states 19V then it will draw only the desired amount of ampage, and all will be good.

    If the adaptor is a higher ampage, sometimes the voltage is also higher (which is not good)
    The Laptop only pulls the ampage it needs
  3. lopdog

    lopdog TS Maniac Topic Starter Posts: 295

    Thank you, that was a clear answer. I will not use that 3.95A charger...
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