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HP G72 wiring diagram for dc - HEWLETT-PACKARD HP G72-B62US Notebook

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Remove cover on g72 biscotti HP


You have the video here :
http://www.youtube.com/watch?v=HRodfme1ntQ

Dec 26, 2012 | HP G72-252us ,biscotti 17.3 Notebook Pc

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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.

http://www.ebay.com/itm/DC-Power-Jack-Cable-HARNESS-HP-PAVILION-G72-250US-G72-B50US-/130587966645?pt=LH_DefaultDomain_0&hash=item1e67a63cb5

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

Example of the AC adapter,

http://www.amazon.com/HP-Replacement-G62-238CA-G62-244CA-Compatible/dp/B004T3QZQM

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.

(Multimeter:
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)

http://h10025.www1.hp.com/ewfrf/wc/manualCategory?cc=us&dlc=en&lang=en&lc=en&product=4217280&

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.

Advise:

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,

http://www.radioshack.com/product/index.jsp?productId=2103245

( 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.

Regards,
joecoolvette

Nov 20, 2011 | HEWLETT-PACKARD G72250US Laptop

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