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Using multi adapters on a Compaq laptop?

Posted on 2008-10-30
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Last Modified: 2013-12-11
I have a laptop that the center pin had snapped out of the DC socket, so i replaced the DC socket and tried to power up the laptop but nothing happened.  The adapter i was given was a multi voltage adapter not the original adapter that came with the laptop.  The adapter is set at 19V which is what the laptop is meant to take and according to the adapter when set at 19V it will output a maximum of 8amps which is fine for the laptop i have which is a Compaq NX9105.

I have measured the voltage coming out of the adapter and it's a fixed 19V, I've also measured the voltage once connected to the motherboard at various stages of the board and there's power going through the components but it just doesn't switch on.

I was wondering if anybody has had experience with multi adapters and whether they just don't work on some laptops? as what i'm, thinking is eventhough the voltage is correct it might not be supplying the correct amps to the board and therefore the laptop is not powering up at all, i'm not even getting a light come on at the front to say that it's plugged in.
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Question by:kreeyon
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Accepted Solution

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rid earned 500 total points
ID: 22844717
Laptops have a voltage notice (19 V in your case) and a current rating on a label (often underneath). If the power supply has a current rating that is equal to or greater than the rating of the laptop, all is well; the laptop can take as much as it needs. If the current rating of the power supply is less than the current rating of the laptop, you're in trouble. The voltage MUST match.

There are some laptops that seem to complain about being fed from a non-brand power brick, but that seems to be an O/S thing; if the unit is not switched on, it shouldn't really notice. You may have a problem with the charging circuitry or the "power conditioning" circuitry inside the laptop.

Does the battery charge?
Can the unit run on battery only?
/RID


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Author Comment

by:kreeyon
ID: 22844799
It wont work on battery as the battery was run completely down so there's no power left in the battery at the moment and the battery wont charge as nothing happens when the adapter is plugged in.

Don't really want to waste money on a new adapter if it's the laptop that's faulty, but just don't know.
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LVL 31

Expert Comment

by:rid
ID: 22844934
And the unit doesn't work on AC with battery removed?
/RID
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Author Comment

by:kreeyon
ID: 22845011
No not on AC at all.  I've measured various components across the board and there's voltage going through but nothing happens.
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