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Laptop Power Brick Connector Change    
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wrtiii



Joined: 27 Nov 2011
Posts: 3
Location: Winnipeg, MB

PostPosted: Sun Nov 27, 2011 12:57 pm    Post subject: Laptop Power Brick Connector Change Reply with quote

Good Morning,

I have an Asus Laptop and It eats through power supplies like crazy. They typically run very very hot. The stock power supply for this machine is: 19.5V 79.A

I have a power supply from a HP Docking Station that outputs: 19.5V 11.8A; but of course the connectors do not match.

I would like to take the connector from one of my blown power supplies and replace the HP one with it.

This is where I have run into problems. The Asus Power Brick has 2 leads from the brick to the laptop. 1 Red 1 White wire. The HP Power Brick has 3 leads from the brick to the laptop. 1 Black 2 White. I am a little confused on which I will need to connect.

- Asus Cord I want to attach to the HP power brick.


- HP Connector that is to be replaced



- HP Power Brick, 3 Leads (1 Black 2 White) while the Asus Cord (seen above) only has 2 leads.
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JTS1957



Joined: 21 Jan 2009
Posts: 2305
Location: Far, Far Away

PostPosted: Sun Nov 27, 2011 1:38 pm    Post subject: Reply with quote

Pix seem to start out OK, but get more blurry as one progresses. Possibly the atoms are vibrating too fast.
Could you possibly resize pix and repost as my local IMAX is booked.
wrtiii



Joined: 27 Nov 2011
Posts: 3
Location: Winnipeg, MB

PostPosted: Sun Nov 27, 2011 2:55 pm    Post subject: More Info Reply with quote

My apologies for the pictures, my new camera is not cooperating very well.

The old power supply has no text or markings of any sort on the pcb. It was a china made ebay thingy and the soldering job is quite horrible. I think they dipped it in flux before shipping.

The HP power supply does have markings. Black is "GND", and is the outer most braid. One White lead I believe is the middle braided shield is marked as "VO" and what appears to be the center conductor also a white lead connected to the PCB is marked "ID"

I cannot get to the underside of the PCB or even clearly to the top due to the aluminum shields that wrap around the PS. The inner most aluminum shield has two solder points pretty much at either end of the PS which are just little tabs that connected it to the PCB

visually inspection of them looks like they are almost just there as a retaining device as I see no runs on the PCB going to or from them.

Hopefully this addtional information will help without the addition of more photos at this time.

http://ducimus.dyndns.org/PSUP should get you to the root of the picture directory where it may be easier to view the current photos?
wrtiii



Joined: 27 Nov 2011
Posts: 3
Location: Winnipeg, MB

PostPosted: Tue Nov 29, 2011 6:07 pm    Post subject: Reply with quote

So I tested the voltages of the new power supply today.

The black outermost braid marked GND at the PCB is obviously the ground

The white middle braid marked VO at the PCB gives me + 19.57 Vdc

The white innermost wire marked ID at the PCB gives me +19.37 Vdc

When I tie the ID and VO leads together and meter it I get a + 19.57 Vdc


on the manufacturer connector from this power brick it still seems that there is only two points of contact, the outer barrel and the center pin. I do not understand why or what the center ID lead is used for.

On the cable/connector I wish to use with this power supply which has two leads white and red. White is the Outer Barrel and red is the inside.

So do I just connect my white lead from the cable to the black ground cable on the power brick and tie the two white leads from the power brick together and connect them both to the red lead of the new cable?

I need to confirm the old power supply polarity tonight but I imagine I can safely assume the polarity is negative sleeve and positive tip as with most if not all laptop power supplies?
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