Laptop AC Adapter with fluctuating DC output



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?

.



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