HP Laptop 3 wire vs. 2 wire problem

Reply

  #1  
Old 12-11-10, 03:53 PM
Member
Thread Starter
Join Date: Oct 2010
Location: usa
Posts: 41
Received 0 Votes on 0 Posts
HP Laptop Power Supply 3 wire vs. 2 wire problem

The power supply on my HP dv6 laptop died. It provided 18.5V DC at 3.5 amps.

I have a working power supply from an older HP laptop that also delivers 18.5V DC at 3.5 amps. I want to use the older power supply with the new laptop.

Here is the problem...

The older power supply has just two wires. 18.5V and ground. The newer laptop (with the busted power supply) has three wires.. all coaxial.

I removed the plug from the newer three wire (broken) power supply with the intention of soldering it onto the wires from older, working power supply with only two wires.

What is the third wire? What do I do with it?

How do I get my laptop, which expects three wires from the power supply, to work with just 18.5V and ground from the old power supply?

Any help would be appreciated.
 

Last edited by Sped2001; 12-11-10 at 04:46 PM.
Sponsored Links
  #2  
Old 12-12-10, 10:24 AM
Member
Thread Starter
Join Date: Oct 2010
Location: usa
Posts: 41
Received 0 Votes on 0 Posts
Update

Update:

It turns out the outer shield is ground, the inner shield is +18.5V DC, and the center conductor is for some sort of data communication between the laptop and the power supply.

I ditched the idea of using the old 2 wire power supply with the 3 wire plug when I discovered the problem was not the power supply, but the connection between the 3 wire cable and the plug that goes to the laptop.

It was very poorly constructed, and the +18.5V and ground were shorted. At least the power supply and laptop were robust enough to survive the short.

I fixed the short in the three conductor plug and now all is well.

Oh, and HP is sending a new power supply under warranty to boot.
 
  #3  
Old 12-12-10, 11:53 AM
Tolyn Ironhand's Avatar
Group Moderator
Join Date: Nov 2007
Location: Twin Cities, MN
Posts: 12,937
Received 55 Votes on 48 Posts
Glad you got it figured out.
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes
 
Ask a Question
Question Title:
Description:
Your question will be posted in: