[MLB-WIRELESS] I need to borrow lappy p/s

[Shaun Clarke]

That's because they use a 3-pin connector. You have the usual ground and
+ve, but there's also a 3rd sense/communication pin.

The ground is the usual outer ring, but the +ve is the inner of the outer
ring. The 3rd pin is actually the tiny center pin (it's not the ground). I
hope that makes sense lol.

Many computers now use the same physical connector but are not interoperable
between manufacturers because of this extra sense pin. This is used to tell
the laptop what type of charger is connected (such as what wattage), but
also prevents non-manufacturer chargers from working.

This would also explain the behaviour with the 3rd party supplies.

Check this link for more info. It relates to Dell chargers, but I think the
principles are the same.
http://www.laptop-junction.com/toast/content/inside-dell-ac-power-adapter-my
stery-revealed

Regards,

Shaun Clarke CTS
Owner

Mobile: 0405 533 641
Email: shaun.clarke at elvtechnology.com.au

ELV Technology
Address: 16 Mulga Place, Carrum Downs VIC 3201, Australia
Web: http://www.elvtechnology.com.au

-----Original Message-----
From: melbwireless-bounces at wireless.org.au
[mailto:melbwireless-bounces at wireless.org.au] On Behalf Of Roger Plant
Sent: Wednesday, 15 December 2010 9:01 PM
To: Rob B; Melb Wireless
Subject: Re: [MLB-WIRELESS] I need to borrow lappy p/s

Hi,

Some HP laptops are very picky about their power adapter, and won't use it
unless its something it likes.
Mine flatly refuses to accept any of the clone adaptor's I have tried on it,
even though the voltage etc seem correct.

Quite happy to use the correct HP power adaptor though...

Regards
Roger



Date sent:      	Wed, 15 Dec 2010 08:12:56 +1100
From:           	Rob B <rbritt at gmail.com>
To:             	Shaun Clarke <shaun.clarke at elvtechnology.com.au>
Copies to:      	Melb Wireless <melbwireless at wireless.org.au>
Subject:        	Re: [MLB-WIRELESS] I need to borrow lappy p/s

> Tale of woe! Got some good bits out of dead lappy, internal p/s 
> circuits seems to be dead, once Vak and I hit the switch mode section 
> it was time to bail. So now I break it up for spares. Thanks for the 
> many offers of help.
> Regards Rob Brittain
> 
> On Tue, Dec 14, 2010 at 11:02 PM, Shaun Clarke 
> <shaun.clarke at elvtechnology.com.au> wrote:
> > I can help!
> >
> > I used to have that model laptop! Was a good laptop until it got 
> > obsoleted by my new EliteBook 8540w.
> >
> > While I don't know where the old chargers are, my new HP laptop used 
> > the same style charger, just with a higher wattage (120watt instead 
> > of 90watt), and I've got a spare you could borrow.
> >
> > I work at Strathmore and live out in Carrum Downs if either of those 
> > locations are good for a pickup?
> >
> > Unfortunately I don't drive so I can't really drop it off.
> >
> > Let me know!
> >
> >
> > Shaun Clarke CTS
> > Owner
> >
> > Mobile: 0405 533 641
> > Email: shaun.clarke at elvtechnology.com.au
> >
> > ELV Technology
> > Address: 16 Mulga Place, Carrum Downs VIC 3201, Australia
> > Web: http://www.elvtechnology.com.au
> >
> > -----Original Message-----
> > From: melbwireless-bounces at wireless.org.au
> > [mailto:melbwireless-bounces at wireless.org.au] On Behalf Of Rob B
> > Sent: Tuesday, 14 December 2010 12:17 PM
> > To: Melb Wireless
> > Subject: [MLB-WIRELESS] I need to borrow lappy p/s
> >
> > I need to debug a HP COMPAQ Nw8440 and I have no power supply can 
> > anyone help?
> > Regards Rob B
> > _______________________________________________
> > Melbwireless mailing list
> > Melbwireless at wireless.org.au
> > https://wireless.org.au/mailman/listinfo/melbwireless
> >
> >
> _______________________________________________
> Melbwireless mailing list
> Melbwireless at wireless.org.au
> https://wireless.org.au/mailman/listinfo/melbwireless

----------------------------
Roger Plant



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