Question about HP Pavilion dv7-1240us Notebook

1 Answer

I need hp pavilion dv7 1240us motherboard power problem solution..i have allready check dc jack,battery,power cord..and i soldring dc jack,battery jack..please some body help me... plz give me this motherboard diagram with solution....

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  • mohsinreja May 24, 2011

    Thanks for your helpful post..hope it will be work for me..
    so soon i try it..& back reply..once again thanks

  • mohsinreja May 30, 2011

    Thanks for response..yes i m sure it is power problem..because i have already check Dc power jack,charger,battery,and other power related cable..but still problem is same..so i need another solution..for your kind information i have already visit this link below.but here is not solution for main board power problem..so please help me and post me troubleshooting solution with picture or video..once again thanks for response... best wishes by Mohsinreja

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  • 106 Answers

I am not exactly sure what is the problem. Are you certain it is a power problem with the mother board? It could also be damaged or non functional.
Here's a troubleshooting guide from HP that might help you.
and the product's manual:

Posted on May 22, 2011

  • mohsinreja May 24, 2011

    Thanks for response..yes i m sure it is power problem..because i have already check Dc power jack,charger,battery,and other power related cable..but still problem is same..so i need another solution..for your kind information i have already visit this link below.but here is not solution for main board power problem..so please help me and post me troubleshooting solution with picture or video..once again thanks for response...
    best wishes by
    Mohsinreja

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1 Answer

Diagram


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,

http://mayohardware.blogspot.com/2010/04/important-parts-on-dv6000-and-dv9000.html

Alpha & Omega Semiconductor LTD - AO4407 - Power MOSFET,


http://www.mouser.com/Search/Refine.aspx?Keyword=ao4407


The AO4407 is Obsolete.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


http://www.mouser.com/ProductDetail/Diodes-Inc/DMP3020LSS-13/?qs=%2fha2pyFadugQJEAqJYuwC0NlHVHA8ivkIi5yij9Xhac5DoEAek3FbA%3d%3d


http://www.mouser.com/Search/Refine.aspx?Keyword=fds6679


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

http://www.mouser.com/ProductDetail/Fairchild-Semiconductor/FDS6679AZ/?qs=sGAEpiMZZMshyDBzk1%2fWi1qxDdW%2fXBi2qgMuZEfLVO4%3d

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,

http://www.ebay.com/itm/HP-CQ42-DC-POWER-JACK-CABLE-DD0AX6PB00-/150980034385?pt=UK_Computing_LaptopAccessories_PowerSupplies&hash=item23271c7f51

[ 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,
http://www.ebay.com/itm/HP-COMPAQ-G42-G62-CQ42-CQ56-CQ62-CQ64-Intel-478-LAPTOP-MOTHERBOARD-605140-001-/350675071935?pt=Motherboards&hash=item51a5dcf3bf
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,

http://h10025.www1.hp.com/ewfrf/wc/product?cc=us&lc=en&dlc=en&product=5048627

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.
Regards,
joecoolvette

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

1 Answer

Fault finding


What! !O_O!

For a statement, such as, "Motherboard not on", you would be stating the motherboard either does not receive power, or the motherboard does not use the received power.

Primer:
You press the Power On button. The first chipset to receive power is the BIOS chipset. The Basic Input/Output System program is initialized.

BIOS looks to see what devices are connected, does a Ram Memory count, turns the Processor (CPU) on; and hands the computer over to the Operating System. (In this case a version of Microsoft Windows)

If the statement is the motherboard is not turning on, you are in effect stating the BIOS chipset is Not receiving power.

Diagnoses must start from the AC adapter (Charger) You need to know if the AC adapter is putting out the correct Voltage. Also while testing have an assistant, gently wiggle the cable FROM AC adapter TO laptop; and power cord TO AC adapter. Any fluctuation in the reading, means a broken wire.

AC adapter proves to be good, the diagnoses goes to the DC Power Jack. The DC Power Jack is the jack on the laptop, that the AC adapter plugs into. (DC_IN)

AC adapter removed, Battery removed; a small instrument is used to see if you can gently move the DC Power Jack. ANY perceptible movement means a bad DC Power Jack -> Replace.

DC Power Jack checks out OK, then the problem will most likely be the Power MOSFET's on the motherboard. They determine if the Battery is to receive a trickle charge, or full charge. Also determines if the laptop is to run off of the Battery, or just the AC adapter.

Using the HP Pavilion dv6000 series, and Pavilion dv9000 series of Notebook PC's; as an example,

http://mayohardware.blogspot.com/2010/04/important-parts-on-dv6000-and-dv9000.html

I can give a lot more, than the generic information above, if I had the Model Number of the Acer laptop. This is on the Bottom of the laptop. Post back in a Comment.

Regards,
joecoolvette

Apr 23, 2013 | Acer Computers & Internet

1 Answer

HP Pavilion dv8 not starting up


Ya know........Pavilion dv8 is a Series of Notebook PC's.

Encompasses a LOT of models in the series.

Have no idea of which LED in front you are referring to.

Do know;

1) Test the AC adapter (Charger) with an economical multimeter.
Average cost is $5 to $12.
Set to DC Voltage, and check the output voltage of the AC adapter.

As far as I can tell the DV8 series uses 18.5 to 19 Volts. (DC)
Use an AC adapter that is rated at 90 Watts, NOT 65 Watts; if using a replacement AC adapter.

The port on the laptop that the AC adapter plugs into is a DC Power Jack. (DC_IN)
The plug end on the power cable from the AC adapter, and plugs into the DC Power Jack, has a Center Hole, and an outside cylindrical metal shell.

The Center Hole is the Positive connection. This is where the Positive (Red) probe lead of the multimeter goes.
The outside cylindrical metal shell is the Negative connection. This is where the Negative (Black) probe lead of the multimeter touches.

Also have an assistant gently wiggle the power cord TO AC adapter; and power cable FROM AC adapter to laptop.
Intermittent reading indicates a broken wire, or wires.

DC Power Jack LED lights up? Means nothing to me. I want to know the FULL DC Voltage is getting TO the laptop, and there are no breaks in the wires of the power cable, or power cord of AC adapter.

THEN AC adapter checks out.

2) AC adapter checks out?
What condition is the DC Power Jack in?
Battery removed, use the eraser end of a No.2 pencil, and GENTLY see if you can wiggle the Center Pin around.

ANY perceptible movement of the Center Pin, means replacement of the DC Power Jack.
Fortunately for this series the DC Power Jack is connected to a cable with wires, and they end in a plug connector. Which plugs into the motherboard.
It is now a DC Power Harness.

HP calls it a Power Connector Cable.

http://www.amazon.com/PAVILION-Series-DC-IN-POWER-HARNESS/dp/B005WMWMMU

3) Next in line are the Power MOSFET's, in the power circuit section, on the motherboard.

!O_O!

MOSFET;

http://en.wikipedia.org/wiki/MOSFET

Power MOSFET;

http://en.wikipedia.org/wiki/Power_MOSFET

Should be on the motherboard, near where the Power Connector Cable plugs in.
Rectangular shaped with 8 'legs'. ('Legs' are J-Leads)

Believe one or more to be the problem.
Typed the rest above because it is a power flowchart, and when diagnosing always go through the steps.
Would s-uck to replace a motherboard, when the problem was an AC adapter, it's power cord, or the DC Power Harness.

This is more on the subject, by using the HP pavilion dv6000 series, and Pavilion dv9000 series of Notebook PC's; as examples,

http://mayohardware.blogspot.com/2010/04/important-parts-on-dv6000-and-dv9000.html

Further this is to show the availability of the Fairchild Semiconductor - FDS6679 - Power MOSFET, and Alpha & Omega Semiconductor - AO4407 - Power MOSFET,

http://www.mouser.com/Search/Refine.aspx?Keyword=FDS6679

Scroll down.

http://www.mouser.com/Search/Refine.aspx?Keyword=AO4407

AO4407 has been phased out. Let's look at one of the cross-reference examples given,

http://www.mouser.com/ProductDetail/Diodes-Inc/DMP3020LSS-13/?qs=%2fha2pyFadujguNNSgppBRqXbOxXLwzGsZm9SWxz1EqWpzoSJOpHpWA%3d%3d

That is correct. $1.01 USD for a FDS6679, and 78 cents for a substitute AO4407.

http://www.youtube.com/watch?v=5uiroWBkdFY

http://www.youtube.com/watch?v=RjpNbuOrOuw

Also check the MLCC's (They are also SMD. Surface Mount Device)
Multi-Layer Ceramic Capacitor

Here are examples. Not correct values, Capacitance, (MicroFarad's), and Voltage,

http://www.mouser.com/Passive-Components/Capacitors/Ceramic-Capacitors/Multilayer-Ceramic-Capacitors-MLCC-SMD-SMT/_/N-b2cj?P=1z0wrjcZ1z0x565

Scroll down.

These will be close to the Power MOSFET's.
See if any are burned, or blistered.

HP Support > Pavilion dv8-1100 using for an example > Manuals download page,

http://h10025.www1.hp.com/ewfrf/wc/manualCategory?cc=us&dlc=en&lang=en&lc=en&product=4100035&

Scroll down.
HP Pavilion DV8 Entertainment PC - Maintenance and Service Guide; in blue.

This is a free Service Manual.
Remove ALL Power. Remove the AC adapter, and Battery.
USE an ESD wrist strap, and have it's alligator clip attached to a good ground source.

For additional questions please post in a Comment.

Regards,
joecoolvette



For additional questions please post in a Comment.

Regards,
joecoolvette

Dec 10, 2012 | Computers & Internet

1 Answer

HP Pavilion DV2000 will not start when power button pressed


Could be a bad;
1) AC adapter (Charger),
Or
2) DC Power Jack, (Jack that the AC adapter plugs into on the laptop),
Or
3) Power On switch, (Power Button Board),
Or
4) Display Lid Switch Module,
Or
5) Power MOSFETs on the motherboard,
Or
6) Ceramic Capacitors on the motherboard.

1) AC adapter:
General example,

http://www.amazon.com/Original-HP-65W-Adapter-Pavilion/dp/B002QCUIZC/ref=sr_1_6?ie=UTF8&qid=1350152535&sr=8-6&keywords=ac+adapter+hp+dv2000

The plug end that plugs into the laptop has a Center Hole, and a cylindrical metal outside shell.
The center hole is the Positive connection.
The cylindrical metal shell on the outside is the Negative connection.

Multimeter function knob set to DC Voltage, the Positive (Red) probe lead goes to the Center Hole.
The Negative (Black) probe lead touches the cylindrical metal shell.

[An inexpensive 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, or look on the checkout aisle racks of major discount stores.
If just a symbol, the symbol for DC Voltage is a dotted line over a solid line. More expensive multimeters have an auto detect feature, that sense when the multimeter is connected to AC voltage, or DC voltage )

You should read 18.5 Volts (DC)

While testing have an assistant gently wiggle the cable from AC adapter to laptop, and the power cord to the AC adapter. A fluctuation of the reading indicates there are broken wires.

AC adapter checks out OK?
Go to the DC Power Jack.

The DC Power Jack on the laptop may have DC_IN next to it.
It has a Center Pin, and surrounding metal shell.
Battery REMOVED, use a No.2 pencil, and see with the easer if you can move the center pin.

If so the jack needs to be replaced.

The DC Power Jack for this model series is attached to wires, that end in a small white plug.
The small white plug plugs into the motherboard.
Easier to replace, than models that have the DC Power jack soldered directly, to the motherboard.
It's a DC Power Harness, and HP labels it a Power Connector Cable.

HP 430462-001 for models that have a UMA motherboard.
HP 430461-001 for models using an Intel processor.

DC Power Jack checks out OK?
Power On switch.

http://www.ebay.com/itm/New-OEM-Power-Switch-Button-Board-for-HP-DV2000-DV2500-DV2700-HL50-4F615-001-/300734714047?pt=Laptop_Adapters_Chargers&hash=item46052f90bf

http://h10025.www1.hp.com/ewfrf/wc/manualCategory?cc=us&dlc=en&lang=en&lc=en&product=1817074&

In the list click on -
HP Pavilion dv2000 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 PDF reader page numbers, and the actual manual page numbers, do not match. When I refer to a page it is the PDF file page.
Go to Page 141 - Switch Cover
Pages 142 and 144 have more details on the Power Button Board.
(Power Button Board is HP part number 417084-001)

How to test?
Multimeter set to OHM. Straight pins (2) in the socket holes of the removed, Power Button Board's cable connector.
Positive probe lead to one pin, Negative probe lead to the other straight pin.
Press the Power On button.

ANY reading indicates a good Power On switch.
No reading of course means a bad one.
(Remember; the Power On switch is a Momentary Contact Switch.
You will just get a brief reading on the multimeter, if good)

Or you can use a small flat tip Jewelers screwdriver, and TEMPORARILY touch the two contact pins on the motherboard, where the Power Button Board's cable plugs into.

Page 179 for the Display Switch Lid Module,
(HP 417087-001)

http://www.sparepartswarehouse.com/HP,Laptop,Part,417087001.aspx

Unplugging the Display Switch Lid Module from the motherboard, and pressing the Power On button, starts the laptop, you need a new lid module.

Power Button Board, (Power On switch), and Display Switch Lid Module checks OK?

Motherboard problems.
There are Power MOSFETs on the motherboard. These are located close to where the plug of the Power Connector Cable, plugs into the motherboard. (DC Power Harness)

The Power MOSFETs control;
Whether the Battery needs a full charge, or a trickle charge.
Whether the laptop is to just run off of the AC adapter, or Battery.

Look to see if any are blackened, burned, or blistered.
Information using the HP Pavilion dv6000, and Pavilion dv9000 series of Notebook PC's,

http://mayohardware.blogspot.com/2010/04/important-parts-on-dv6000-and-dv9000.html

Just to show the average cost of a Fairchild Semiconductor - FDS6679 - Power MOSFET,

http://www.mouser.com/Search/Refine.aspx?Keyword=FDS6679

One dollar and one penny USD.

Looking at the second photo down on the Mayohardware blog link, look at AO4407.
(Alpha and Omega Semiconductor)

Look to the right of the Yellow circled AO4407. That small rectangular shaped object, with a dark wide band on it, is a Ceramic Capacitor.
There is one above it of the same size, one above that, and one to the right of the top one.

Average cost of them is around 62 cents to 80 cents.

Average cost of a replacement motherboard is around $40 to $60 on Ebay.

That does it for me right now. Post additional questions in a Comment.

Regards,
joecoolvette

[If you had stated it seemed the laptop came on, but had a blank screen, that is a Different problem ]

Oct 13, 2012 | Compaq Pavilion ZT3280US Notebook

1 Answer

Is not charging battery


If the laptop works with the AC Adapter Power Cord ok without any problems except the battery is not charging, then the battery is dead. Batteries only have a useful life, then they have to be replaced.

If the laptop does not work with the AC Adapter Power Cord then either the Power Cord is bad or the DC Power Jack where the power cord plugs into the laptop is bad. If either of these is bad, a good battery will not charge.

Check your DC Power Jack which is where the power cord plugs into the computer is bad. Take an ink pen and push the tip inside the jack and see if the little pin wiggles, if so the jack is bad. You'll have to take the laptop apart to fix it. Most times it is soldered onto the motherboard, so you will have to desolder the old and solder a new one.

Jun 06, 2012 | HEWLETT-PACKARD Hewlett Packard 413671-001...

1 Answer

HP Pavilion dv8309US (EZ590UA). My issue is the power. I would have it plugged in and the computer would not recognize the cord being plugged in as time went on it would not charge the battery and now does...


First of all check out the AC adapter (Charger) and see if it is putting out 18.5 Volts DC
If you do not have a multimeter, an economical one can be purchased for around $8 to $12.
Carried in a multitude of stores. An auto parts store is one example.
Analog or digital, either one will do. (I prefer analog with a meter, and a needle)

Plug the AC adapter into power. (Not plugged into the laptop)

In the plug at the end of the cable from the AC adapter, that plugs into the laptop, is a Center hole, and a metal shell which surrounds the outside.
The center hole is Positive. This is where the Positive (Red) probe lead touches.
The outer metal shell is Negative. This is where the Negative (Black) probe lead touches.

Function knob on multimeter is set to DC Voltage.
(Symbol is a dotted line over a straight line.
The curved line over a dotted line is for AC Voltage. VAC, and VDC are also used. Voltage AC, and Voltage DC)

Voltage reads close to 18.5 Volts? (DC)
Have a helper wiggle the cords around. The AC cord that is connected to the AC adapter, and the DC cord that comes from the adapter, and plugs into the laptop.
See if there is an intermittent reading.
Indicates a break in the wires of the cable.

If there is a break most of the time it will be where the cable meets a connector, or cable meets the AC adapter, or meets the AC plug that plugs into the receptacle. (AC receptacle. Surge protector, or on the wall)

AC adapter checks out OK?
Go to the DC Power Jack.

AC adapter removed from laptop, Battery removed also.
The DC Power Jack is the round port on the laptop, that the plug from the AC adapter plugs into.
See if the center pin is loose. Try to gently wiggle it. You may have to use a tool such as a pencil.

Center pin checks out?
See if the metal shell that surrounds the center pin is loose.
Either one indicates replacing the DC Power Jack.

The DC Power Jack for this model is not soldered directly to the motherboard. The rectangular DC Power Jack slides down into a slot in the outside of the laptop's lower case.
The DC Power Jack has a cable coming from it, and the connector at the end of the cable plugs into the motherboard,

http://www.machinaelectronics.com/store/buypart/HP_Pavilion_DV8000_DV8309US/DC020005G00

Click on the photo to enlarge.

No damage apparent from outside the laptop?
Suggest you remove the DC Power jack and cable, and perform a Continuity check on it.
(Function knob set to Ohms. 1K
Should have an Omega symbol for Ohms. Look like an upside down capital U.

Positive probe lead touches the center pin. Negative probe lead goes into one of the three socket holes, at the opposite end of the cable, in the connector. (That plugs into the motherboard)
You can't physically see what wire goes to what unless you remove the sheath off of the cable.

No need. Just touch all three socket holes one at a time.
If there is no reading you have a break in the wire in the cable, or the wire's connection at the DC Power Jack is bad.

Once you find out what wire (Socket hole) is for the Center Pin, run a continuity check on the Outside Shell of the DC Power Jack.

Now connect the Positive probe lead to the Center Pin, and the Negative probe lead to the socket hole for the Outside Shell. There should be no reading.
If so wires are touching inside the cable.

DC Power Jack and it's cable check out OK?
Suspect a bad sensor on the motherboard. A Chipset.
Reads when the AC adapter is plugged in, and reads when it alone is being used.
Reads if the Battery needs a trickle charge, or a full charge, or no charge.

Requires motherboard replacement.

1) http://www.ebay.com/itm/HP-DV8309US-DV8310CA-DV8310US-DV8315CA-MOTHERBOARD-USA-/390300779614?pt=Motherboards&hash=item5adfbd445e

2) http://www.sparepartswarehouse.com/HP,Laptop,Part,417029001.aspx

NOT advertising for either seller above. From a quick search. Proceed at your own risk.

HP Support > Pavilion dv8309us Notebook PC > Manuals,

http://h10025.www1.hp.com/ewfrf/wc/manualCategory?cc=us&dlc=en&lang=en&lc=en&product=3192906&

In the list left-click on -
HP Pavilion dv8200 Notebook PC, HP Pavilion dv8000 Notebook PC - Maintenance and Service Guide.
This is a free Service Manual.

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 for the first page to come up.
It may also take additional time for the file to fully download.

You can save a copy to your computer. (The above is a temporary download. After you close the PDF window, you have to go back to the link, and download again)
If you save a copy to your computer you can burn it off to CD disk, and have it anytime you want.
After checking out that the copy is good, you can delete it from your computer, and save harddrive space.

In the Bookmarks menu to the left, left-click on the + sign next to -
Removal and replacement procedures

Scroll the page down, and left-click right on -
5.23 Fan Assembly (Page 162)
Page 165 deals with the DC Power Jack and cable removal. (HP - Power Connector Cable)

5.16 System Board deals with replacing the motherboard. (Page 140)

For additional questions please post in a Comment.

Regards,
joecoolvette

Sep 16, 2011 | HP Pavilion dv8309us (EZ590UA) PC Notebook

1 Answer

I have an hp dv2500 and it won't power on. Purchased a new power cord and battery still nothing. Reseeded the hard drive and ram nothing. Tried to power on without the battery and then restart nothing. The...


Hi,

There's a lot of causes why this has happened in your laptop. Here are some possible causes and solutions to this problem:

Since you bought a new laptop battery, probably it is good and your AC power adapter also, because you said that the power cord light remains on. I think what you mean for the power cord is that it is the AC power adapter.

First, try to power up your laptop through the new laptop battery that you recently bought if you believe it is holding a charge and make sure you don't plug in the AC power adapter into your laptop. But before you turn on the laptop, make sure that the contacts between your laptop battery and your laptop motherboard is making a good connection. Because sometimes it will not, maybe something spilled in there or there's some dust covering the contacts or some sort of dirt and they're not making a clean connection. To be sure that this is not happening to the contacts or your laptop battery and the motherboard of your laptop, pull the battery out, take a toothbrush and just scrub in between the pins of the battery there and also scrub down the the pins where the motherboard connection is (which is the contacts between the battery and your laptop motherboard, where you install the battery). If you are done doing this, put the battery in and turn the laptop on.

If the steps above doesn't solve your problem, try this one:

* Pull the battery out
* Remove main supply
* Hold power button down for 30 seconds. This will drain the charges in your battery.
* Put only power supply in
* Do not put battery in
* Turn laptop on
* Put the battery in

If you're done doing the steps above and did not solve your problem you can try the steps below:

You have to test if there's a fix voltage on your AC power adapter by using a voltmeter, usually 18 to 19V DC depending on the registered voltage written on your AC power adapter. If there is, kinda bend or jiggle the power cord a little bit to make sure the connections is tight. If the voltage remains steady, then probably your AC power adapter is good. Now we have come to the point that we need to deal with your laptop motherboard. There's a lot of reasons why your laptop won't power on even if you have a good laptop battery and AC power adapter. Maybe your laptop motherboard is partially bad, like for example if the dc jack on your laptop is bad and is not making a connection to the motherboard then it might look like the battery is bad as well because the battery is now now holding a charge or even taking a charge. Now this has happened a lot to plenty of laptop owners where their dc jack goes bad. They think their batteries gone bad because is not taking a charge anymore, they got and buy a new battery and then decide to bring their laptop to a laptop repair company because of the battery's not charging even with the new battery, that's because the dc jack is bad. You're going to probably right into this a lot where the battery's not charging because the dc jack is bad and until you fixed that, the battery's never going to charged. So how do you test if your dc jack is bad? It's simple, plug in the AC power adapter, take the battery out of the computer. If the computer doesn't power on then you know you have a problem with the dc jack. The only way to solve this, is that you have to disassemble your laptop, start taking components out one by one and finally, take the laptop motherboard out. Afte you've taken the motherboard out, look where the dc jack is connected. After you will find it, take a file tool and file off a spot on the motherboard where you can reattach the power jack and use a wire to reattach the power jack to the motherboard.

Hope you will find this answer helpful. God bless

http://compunics.blogspot.com/2010/06/podnutz-high-definition-laptop-repair.html

May 14, 2010 | HP Pavilion dv2000t 14.1" Notebook Laptop...

1 Answer

Charging power cord doesn't fit snug therefore doesnt charge battery


Is this the original power adapter, or a replacement. If it's an original and you're having this problem, then you're probably going to need to get the female DC Jack on the motherboard re-soldered or replaced. If your power supply\adapter isn't the original one, then it could be that the replacement you got is not the correct replacement for your laptop. It could still also be that your female DC Jack has gone bad and needs to be re-soldered or replaced. Those are the 2 most likely reasons for your problem of the battery not charging.

Apr 10, 2010 | HP Pavilion Dv9910us Notebook PC

3 Answers

Hp laptop will not power up...at all. In fact the


1) You need to check the power supply itself to mkae sure it still puts out the DC voltage as indicate on the power supply.

2) You may have cracked solder joints at the DC input jack of the laptop.

look here for more info: www.insidemylaptop.com

Oct 26, 2009 | HP Pavilion dv9000z Notebook

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,
http://www.megaemarket.com/dc-power-jack-hp-pavilion-ze4200-zt117420011721182125.html
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.

Solution?
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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