Re: Laptop AC Adapter with fluctuating DC output

On Jun 29, 5:19 am, NoS...@xxxxxxxxxxx (Bob Masta) wrote:
On Thu, 28 Jun 2007 23:10:35 -0700, slider123...@xxxxxxxxxx wrote:
I have a dell laptop that won't power on or charge the battery but
ran fine on battery until the battery lost its charge . I checked the
DC output of the AC adapter with a multimeter and it constantly
fluctuates from 18.5v - 19.5v.

I have another laptop a toshiba which happens to have an adapter with
the same output 130w 19.5v 6.7a and when I measured it the output
stayed at exactly 19.3v.

The toshiba adapter has a 2 prong input from the AC plugin and the
Dell adapter has a 3 pronged plugin on the AC side. Is the fluctuation
on this type of Dell ac adapter normal? Or is the fluctuating DC
output the reason that the laptop won't start or charge the battery?

Did you measure that fluctuating Dell adapter output with
an appropriate load applied? I have seen this sort of behavior
from an unloaded adapter, which technicians decided was OK
since it was the right voltage range. But as soon as a decent
load was applied, the output dropped to zero.

Best regards,

Bob Masta

D A Q A R T A
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Scope, Spectrum, Spectrogram, Signal Generator
Science with your sound card!

I did not test the output under load. I would like to so I can see
what happens but I am not sure what I should use as a load. Using the
laptop is very hard since the motherboard has to come out in order to
have access to the pins for testing. The adapter output is rated for
19.5 volts 6.7 amps. Do you have any suggestion for what I could use
as a load so I can test the adapter



.

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