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Compaq Presario CQ56 Notebook PC. DC power harness wire pin out please?

I'm looking for what each wire that comes from the DC connection in. It's a 7pin output and I am at wits end and 4 1/2 days of searching and can only find pictures of the dc in connection harness and where to buy it no actual information on what I'm looking for. Please help

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Unfortunately, it is not possible to provide a definitive answer to this question without knowing the exact model of the Compaq Presario CQ56 Notebook PC. Different models may have different pinouts for the DC power harness. You may need to consult the user manual or contact Compaq/HP support for more information.

Posted on Feb 21, 2023

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HP Presario CQ56 wire diagram for the DC power unit

A mains cable is $5.80

There are only 3 connections on that, live neutral and ground. The wire on the other end or the mains transformer has a single plug with live and neutral as shown here. Not sure where you are finding 7 wires?

Don't start messing with the motherboard connection over $5.80. Head down to Goodwill, you find them for $2 complete.


What wires go to where inside of a compaq presario cq56 laptop ?

are you meaning the wifi wires as the rest all have there own sockets and they only fit in the right ones. cable length only fits to them.

I need wire diagram for my compaq presario cq56

Contact Compaq/HP support and ask. Include pics if possible.


Battery is bad, or the Power MOSFET's in the DC - DC circuit on the motherboard; are bad...........

Using the HP Pavilion dv6000, and HP Pavilion 9000 series of Notebook PC's; as an example,

Alpha & Omega Semiconductor LTD - AO4407 - Power MOSFET,

The AO4407 is Obsolete.
Using one of the cross-reference examples shown,

The Fairchild Semiconductor Industries - FDS6679 - Power MOSFET, is also Obsolete.
Using one of the cross-reference examples shown,

Where are these power MOSFETS located on the motherboard, for the HP G42 series of Notebook PC's?
In the DC to DC circuit on the motherboard.

Where is that?
Where the DC Power Harness plugs into the motherboard,

[ The jack on the laptop that you plug the AC adapter into, {Charger}, is the DC Power Jack.

When the DC Power Jack is connected to wires, or a cable; it is then known as a DC Power Harness.
Some refer to it as the DC Power Cable ]

Let's look at an example of a motherboard, as used in the HP G42 series of Notebook PC's,
The large main photo that automatically comes up, is a TOP view of the motherboard. To the far Right is where the DC Power Harness plugs in.

You can set your mouse cursor in the middle of the photo, and this activates the Zoom In feature.

How do I know? I'm looking at the Service Manual right now,
HP Support > HP G42-415DX Notebook PC > Main Support page,

Click on -> User Guides, in the list.

Click on >
Compaq Presario CQ42 Notebook PC and HP G42 Notebook PC - Maintenance and Service Guide

For additional questions please post in a Comment.

My compaq presario cq62 wont turn on i bought a new power chord but it still does nothing

Shane, new power cord? Does this mean the old one was bad?

Do I assume you used a multimeter;
1) To test the voltage output of the AC adapter (Charger),

2) And had an assistant gently wiggle the cable TO laptop, and power cord TO AC adapter; to see if there was an intermittent reading on the multimeter?

[The Center Hole on the plug end of the AC adapter cable TO laptop, is the Positive connection. The outer cylindrical metal shell of the plug, is the Negative connection.
You should be reading 18.5 Volts DC.

An economical multimeter can be purchased for as little as $5 to $12. Available in a multitude of stores. An auto parts store is but one example. I have seen them on the checkout aisle racks, of large discount stores.

The Positive (Red) probe lead is inserted into the multimeter, in the Red hole that has DC Voltage next to it. (DCV)
The Negative (Black) probe lead is inserted into the Black hole ( - )

The Function knob is set to DC Voltage. If just a symbol, the symbol is a dotted line over a solid line.
IF there is more than one DC Voltage scale, the Function knob is set to the 0 - 50 Volt scale. { 0 to 50 ]

AC adapter checks OK?
Then check the DC Power Jack.
The DC Power Jack is the jack on the laptop, that the cable from the AC adapter is plugged into. (DC_IN)

AC adapter removed, ('Natch), and Battery.
Use a No.2 pencil, and it's eraser, to see if you can gently move the Center Pin, in the DC Power Jack.
ANY perceptible movement means replacing the DC Power Jack.

However good news. The DC Power Jack is NOT soldered directly to the motherboard.
It is a DC Power Jack that has wires coming from it, and the wires end in a small white plug.
This assembly is called a DC Power Harness,

All you have to do is partially disassemble the laptop, unplug the DC Power Harness plug from the motherboard, and replace,

USE AN ESD wrist strap, and connect it's alligator clip to a good ground source.
I connect to an unpainted surface, of the metal frame of an open, empty desktop computer case.

You can also set a large metal serving plate (Unpainted), on the table you are working on, and connect to it.
Or a large metal knicknack. (Unpainted)

Use a mutli-compartment container for the various screws you will remove.
Label each compartment for the area the screw/s come out of.
SOME screws look VERY similar to other screws.
Advise do NOT mix them up.

(Just so you have it in case you need it for the future, )

HP Support > Compaq Presario CQ62 series of Notebook PC's > Manuals > Service Manual, (Free),

Click on the first file listed -
Compaq Presario CQ62 Notebook PC and HP G62 Notebook PC -
Maintenance and Service Guide

This is a PDF file. The computer you are using now has Adobe Reader on it, which uses PDF files.
After you click on the above file name it may take up to 30 seconds, before the first page comes up.
(The file is downloading in the background)

AC adapter checks out, DC Power Jack checks out?
Check the Power On switch.

The Power On switch is pressed with the Power On Button.
The Power On switch is part of the Power Board,

This part separates the user from the tech. There are 6 wires in that flat cable. (I believe 6) There are 6 contact pins in the motherboard connector, for those 6 wires. TWO of those contact pins turn the laptop on. A tiny flat tipped Jewelers screwdriver, is used to MOMENTARILY touch the two contact pins.

{The Power On switch is a Momentary Contact Switch }

Laptop comes on you have a bad Power Board.

Laptop does not come on;

One or more Power MOSFETs may be bad, and may include bad Ceramic Capacitors (MLCC) for the Power MOSFETs.
Information using HP Pavilion dv6000 series, and Pavilion dv9000 series Notebook PC's as an example,

Yes, motherboard replacement

For additional questions, or to have me clarify anything I have stated, please post in a Comment.


Hewlett Packard Compaq Presario CQ56 power/charge light blinking orange & will not charge. I replaced the charging unit but it is dtill not charging. What could the problem be?

You need to get the DC Power Jack Either Repaired or replaced...this is the "female" port where your AC Power cord plugs into.. To Repair the current DC Jack...First you'll need to look closely at the Positive posts to see that they are not broken.. If visibally ok.. then you can look at the Solder Connections.. they will need to first be Desoldered.. Cleaned, then Resoldered back in place.
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