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Need to know which wires go where on hp g72 dc jack

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2 Answers

Bad dc jack or motherboard?

Possibly the motherboard. I have no data on voltages as HP didn't allow that sort of information.

Apr 26, 2014 | Compaq Presario CQ62-215DX Laptop

1 Answer


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The AO4407 is Obsolete.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.

Jul 09, 2013 | HEWLETT-PACKARD G42-415DX Laptop

1 Answer

My hp no power model g72

Remove main battery and try again, next have the power adapter checked for correct voltage, if okay! the DC jack in the laptop is another source of trouble, at this point the laptop must be dismantled down to the motherboard level to address the issue.

Apr 11, 2012 | HP Computers & Internet

1 Answer

UPDATE:COMPUTER is defective and when I started working with Hewlett-Packard in February of 2011 it was still under warranty. It is now November of 2011 and the computer is NOW DEAD and Hewlett-Packa

Meaning to me that either the AC adapter (Charger) is bad, or the DC Power Jack on the motherboard is bad, OR if neither is the problem, the problem is then a 'power' sensor chip on the motherboard.

The DC Power Jack is the jack you plug the AC adapter into, on the laptop.

This jack can become damaged resulting in no power to the laptop, to charge the battery, OR to run the laptop.

1) AC adapter removed, also remove the Battery. All power must be removed.
Use an object to see if you can move the center of the DC Power Jack, around.
See if the center moves, and/or the outside shell.

ANY perceptible movement means a bad DC Power Jack.

This particular DC Power Jack is connected to a wire harness. Has a plug on the other end of the harness. The DC Power Jack assembly just unplugs from the motherboard.

Means it can be replaced more easily, than a DC Power Jack that is soldered directly to the motherboard.

Also means the same as a soldered jack, in that if it moves in the center, it's damaged.

(Not an advertisement for Ebay, nor the seller. Posted for visual information )

Example of the AC adapter,

A multimeter is set to DC Voltage, and used to check the AC adapter.
The center is Positive, the outside is Negative, on the plug.

Analog or digital is fine. (I prefer Analog)

Red lead is the Positive probe lead, Black lead is the Negative probe lead.
Set the Function knob to DC Voltage. If just a symbol, the symbol is a dotted line over a solid line.
(NOT a curved line)

AC adapter plugged into power.
Positive probe lead to the center, Negative probe lead to the outside shell.
You should be reading 18.5 volts.

With the help of an assistant, have the assistant gently move the cord around; first from the receptacle plug to AC adapter - cord, then the AC adapter to laptop - cord.

See if there is an intermittent short caused by a break in the wires, of either cord.

( An economical multimeter can be purchased from $5 to $12. Available in a multitude of stores. An auto parts store is one example )

DC Power Jack replacement:

1) Perform a search for - HP G72-250US DC Power Jack. Find the best price from a Reputable dealer.

2) Service Manual (Free)

Click on the top file listed in blue -
Compaq Presario CQ72 Notebook PC and HP G72 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 link, it may take up to 30 seconds before the first page comes up.
(Using Adobe Reader X { 10 } , and medium speed DSL connection. Took 6 seconds to fully download )

If you are familiar with the following disregard;

At the top of the PDF file in the header, is the page number box, and the Zoom Out/Zoom In icons.
The page number box is for the PDF file ONLY, and does not always refer to the actual page of the manual.
The page number box is to the right of the Down Arrow.

To Increase the view click on the Zoom In icon. ( + )
To decrease the view click on the Zoom Out icon. ( - )

Go to Page 83 (PDF page)

You can use the Down Arrow to arrive at Page 83, or;
1) Put your mouse cursor in the page number box
2) Left-click once
3) Type 83
4) Press the Enter key

You can also use the Bookmarks menu on the left.
Under - Component replacement procedures, click on - Power connector

Following the steps 1 through 11 on Page 83, you will see various component removal shown in Blue.
Clicking on each one, one at a time, you can go to detailed info about removing that component.
Then just go back to Page 83.


A) Use an ESD wrist strap, and have it's alligator clip connected to a good ground.

Your body carries Static electricity. Static WILL fry out (Short Circuit) the delicate hardware components inside a computer. (Desktop or laptop)

Using an ESD wrist strap will ensure that your body has no Static electricity, and will ensure the safety of your laptop. (Electro Static Discharge)

An average ESD wrist strap is around $5 to $8.
One example,

( I connect to an unpainted surface, of the metal frame of an open empty desktop computer case )

B) Use a multi-compartment container for the various screws you will remove.
Label each compartment for the area the screw/s come out of.
If no multi-compartment container is available, substitute with a clean egg carton.
Label each egg holder.

Some screws look VERY similar to other screws.
Do Not mix them up.

C) Make notes, and perhaps drawings as you disassemble. Perhaps a digital camera, or video camera, with good lighting, also.
Nice to have a record to refer back to in case you are interrupted, and also nice to have a Personal record.

If the DC Power Jack is bad just unplug it, and plug in a new one.

If the AC adapter proves to be good, and the DC Power Jack, then the problem is a sensor chipset on the motherboard.
This chipset determines when the battery needs a charge; full charge or just trickle, and also senses whether the laptop is to run off of the AC adapter only.

For this problem a motherboard replacement is the best option.

(Finding if the problem is just reserved to that chipset, or has gone on; and also finding a replacement chipset, AND the technician/s, and Proper equipment to replace it, versus just replacing the motherboard )

For additional questions please post in a Comment.


Nov 20, 2011 | HEWLETT-PACKARD G72250US Laptop

1 Answer

Does an HP 17.3 biscotti 4 g 320 gb laptop have an internal modem?? I live in a rural area- only have dial -up bought this new and need to know if I need to buy an external modem for use

Yes it has Internal modem. Moreover it has wireless lan and Wired lan port.Please reply back if you found any difficulties to connect with internet

Dec 07, 2010 | HEWLETT-PACKARD HP Biscotti G72-B49WM...

4 Answers

Hello my laptop t41 power is not even flash but the adapter is working,am technician and i have troubleshoot allot.

I concur with what Diegotech stated.

To iterate further;

1) The DC Power Jack (DC IN), may have cracked solder joint/s on the motherboard connector, (Female), where the DC Power Jack plugs in.


2) The DC Power Jack may be broken.
Center Pin mount, and/or body of DC Power Jack, and/or Outer Shell mount.

Replace DC Power Jack.

3) Wires from the DC Power jack plug to the female connector on the motherboard, may be bad.

Replace DC Power Jack.

Two examples, of a place to buy an IBM ThinkPad T41 DC Power Jack,



Past this point it's a bad DC sensor on the motherboard.

Replace motherboard.

IBM ThinkPad T41 Service Manual, (Free),

On this page go down to the 8th line.
The one that starts with > ThinkPad T20.

Go across, and click on > T41

Takes approximately 2 seconds to see the first page, and additional time to fully download.

Page 142 for 14.1 inch LCD screen
Page 151 for 15 inch LCD screen

(PDF file page number box at top)

Dec 01, 2010 | IBM ThinkPad T41 Notebook

1 Answer

I have a hp pavilion dv7 and the power socket has come a lose i need to know which wire goes where.....

The DC Power Jack that the AC adapter (Charger) plugs into?

Look into the DC Power Jack with a magnifying glass and light you'll see it's a center pin surrounded by a barrel. Barrel has an inside and an outside.

1) Center pin. Gold and buried down in the plastic. Connected to WHITE wire at motherboard connector.

2) Inside barrel has 4 Brass fingers.
Orient the laptop so the LED is at 12 o'clock and you'll see fingers at 12, 3, 6 and 9 o'clock.

These fingers carry the + 19 volt power to computer.
The ones at 6 and 9 o'clock do, Noon and 3 are not connected.
+19 Volt power arrives at motherboard connector on RED wire.

3. Outside barrel has six brass fingers, at 2, 3, 4, 8, 9 and 10 o'clock.
2, 3, and 4 are not used,
2, 8, 9 and 10 are the power return (common, or ground) to computer.
It arrives at motherboard on BLACK wire.

4. LED is connected to YELLOW wire and controlled by computer.
Other side of LED is jumpered to a Black wire,(Ground), outside barrel 8, 9, and 10 o'clock.

From > analog posted in an HP Support Forum.

Nov 12, 2010 | HP Pavilion dv1000 Notebook

1 Answer

HP Pavilion dv6000 plugged in not charging, I have a new battery.....PLZ Help.

Its the DC charging jack that you plug the charger into on one of the sides of the laptop. Do a google search, go and search for "HP dv6000 DC jack problem charging" (leave out the quotes) and you will see this is a common issue with the dv6000 and laptops in general. Many will just replace the whole laptop motherboard as the DC jack is attached to the board. If you know what you're doing, you change out the jack, quick repair job and keep your own board, but fixed. I would fix it if it were mine. You may be able to find someone local online but if you need someone to do the repair, I'm in the repair directory, as are many others qualified.

Note: It may come to a point, or the situation may just fit better to replace the entire board instead of the port alone. This is usually when the jack is not seated and easily replaceable, or if you are under warranty, HP will replace the whole board.

Mar 08, 2010 | HP Pavilion dv6000 Motherboard

1 Answer

Acer 5920g no power

Your DC Power Jack is bad, or the area of the motherboard where the DC power jack attaches to, is bad.

The DC Power Jack, is the small port where your AC adapter,(Charger), plugs into.
This is an example of an average DC Power Jack, for an HP Pavilion laptop, not installed in a laptop yet,
If you click on the photo it will enlarge.

The DC Power Jack in the photo is upside down, in relation to how it sits on your laptop's motherboard.
Those flat metal pins shown on top, go down through the motherboard, and are soldered on the other side.

1.Sometimes when the 'charger' plug is in the jack, and is bumped, it can crack the solder joints for the DC Power Jack's flat pins. This makes an intermittent contact. Eventually there is no contact at all.

2.Sometimes it's a bad design of the DC jack, and just from ordinary usage of the user plugging in the charger, and removing it, this can crack the solder joints.

3.Sometimes the small area of the motherboard where the DC power jack is mounted, can crack away from the main body of the motherboard.
To explain:
Crude example;
Envision a laptop's motherboard as having a 1 foot square shape. (It isn't. It's irregular shaped) Now on one side attach a 2 inch square. This 2 inch square, represents the area that the DC power jack is attached to. A 'Peninsula', if you will. There are circuit traces that go along a motherboard. Think of them as Very, flat, thin, strips of copper wire. These 'wires' become stretched, and break as the 'peninsula' cracks away from the main body of the motherboard.

Have the DC Power Jack replaced, or the motherboard.
DC Power Jack cost? About $6 to $8 dollars.
Labor? $100 to $150.
The tech has to completely disassemble the laptop, to just the bare motherboard in hand. Then unsolder the DC power jack, resolder a new one in, and reassemble the laptop.
Motherboard cost? About $150 on up. Depends on where you obtain it. (Ebay?)
Labor? $100 to $200.

Jul 12, 2009 | Acer Computers & Internet

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