On Jul 2, 1:40 pm, Jim K wrote:
On Jul 2, 12:53 pm, "Man at B&Q" wrote:



On Jul 2, 12:39 pm, Jim K wrote:

do laptop chargers "sense" and adjust their output somehow?? meaning I
can't actually say 100% it's the charger that's shagged & just acquire
a new one...?

All help appreciated

Cheers
Jim K

All the "chargers" I've seen are just switch mode power supplies.
Indeed, the generic replacements (rather than branded) ones make very
good power supplies for other uses. Shouldn't cost mor ethan £20 for a
new one.

The charging intelligence is in the laptop and/or battery.

MBQ

Righto.

So I chopped the jack of the end to reveal a 3 core cable (which
surprised me a bit - was expecting 2)

There's an outer screen of decent multistrand (1) , then inside that
another smaller screen (2) & a core (3)

Now I can indeed get 19.5 from the bare end from the tranny -across 1
& 2
When I test across from 3 to 2 - i get 12.5v...

On the jack plug end (now removed and opened up to check) there are
indeed 3 connections - Outer screen (1) to outside of jackplug, inner
screen (2) to (appears to be) the inner surface of the jackplug ??, &
Central core (3) to centre pin.

Is this making any sense to anyone?

Cheers
Jim K

now bodged back together - but I reckon it's still same as b4.

Haven't got the lappy here so can't check...

Has anyone got a Dell PA12 charger/power lead and would kindly run a
meter over the jack plug end for me to see if this one is shagged or
not?

to recap this one gives
a) 19.5v between the inner and outer surfaces of the cylindrical bit
of the jack plug
b) 12 ish V between inner surface of the cylinderical bit and the
central pin
c) when off i get 6k ohm resistance across b)'s which I think works
out as a voltage dropper 19.5v to 12v that I see in b)

Cheers
Jim K