Question about HP Computers & Internet

2 Answers

Hp 625 no power on

Light beside the dc jack on motherboard is ok... the power board was changed. and always no power up. I always try another CPU Thanks for help

Posted by on

  • contact347
    contact347 Dec 10, 2012

    The motherboard is 611803-001 (HP 625)


2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • HP Master
  • 5,660 Answers

A) Using another Processor won't do squat. (CPU)

B) Power Board was changed? OK, fine.

All it is though, is a -> POWER ON SWITCH.
Not a power circuit board.

HP part number - HP605794-001

C) Power LED is on, on laptop?
(Light beside DC Power Jack)

Does the AC adapter (Charger) put out 18.5 Volts DC?
Did you have an assistant wiggle the power cord, and cable from AC adapter TO laptop; to see if there is a break in the wires?

Is the DC Power Jack in good repair?
Center Pin does not move? Jack seems to be solidly soldered to motherboard?

[Battery also removed when checking condition of DC Power Jack ]

All checks out OK?

Suggest one, or both of your Power MOSFET's is bad.
Suggest one is shorted out.
Or one is Open.




The power circuit section of the motherboard, (DC - DC ), is close to the DC Power Jack,

The above is BOTTOM view of the motherboard. The white rectangular shape with the multiple holes in it, is the Processor socket.

To the right is the LEFT side of the motherboard.
The silvery port at the Top is the VGA port.
Below it is the DC Power Jack.
[Then Ethernet port, HDMI port, and USB port ]

Use -> Mouse here to Zoom in <- option.

See the black rectangular object marked TS21C?
(HF / 1023H)
That is a 10/100 Base-T Ethernet Isolation Transformer, made by Taiwan Semiconductor.

Look way above it at C521, C524, and C523.
Those are MLCC's.
Multi-Layer Ceramic Capacitor. (And Surface Mount Device. SMD)

Now look to the top right of them, at the rectangular black chipset, that has 8 'legs'. Looks like a bug. There are 4 legs on each side.
(Those 'legs' are J-leads)

THAT, is a Power MOSFET.
There is a smaller one to the immediate left of it.
(They are right below 2R2 024 M1J )

Now read this article about P.MOSFET's used on the HP Pavilion dv6000 series, and Pavilion dv9000 series of Notebook PC's,

In this application, and with the two P.MOSFET's used; the Alpha & Omega - AO4407 - Power MOSFET, if shorted out will Not let the power circuit turn on.

"IF the AO4407 is shorted - The unit will not come on"

Also if the Fairchild Semiconductor - FDS6679 - Power MOSFET is OPEN; the unit will not come on.

Do Not know what P.MOSFET manufacturer, or value/s are used, on your HP Compaq 625 Notebook PC.

Example of purchasing an FDS6679, and AO4407,

Scroll down.
$1.01 USD

Phased out. Cross-reference examples are shown.
Using DMP3020LSS-13 as an example,

78 cents USD.

Also check all of the MLCC's.
Examples of MLCC's that are SMD, and 4.7uf (MicroFarad) capacitance, and 16 Volts DC; values,

NOT stating they are the correct values for some of the ones, on the laptop's motherboard. JUST examples.

Service Manual (Free) from HP Support,

Hope you are using an ESD wrist strap, and have it's alligator clip attached to a good ground source.
Otherwise get ready to use your motherboard for a Frisbee.

For additional questions please post in a Comment.


Posted on Dec 10, 2012

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • HP Master
  • 27,725 Answers

Test your PSU power supply unit or replace it if your power supply units fan is not working your PSU is faulty WARNING: Before you start troubleshooting remember that you are dealing with electricity that can KILL. - rules

Test all power and data leads that attach to your hard drive IDE,SATA
The leads from your MOTHERBOARD TO YOUR HARD DRIVE make sure they have secure dust free connections and are not faulty. Any bad or faulty power or data lead or connection can cause a computer not boot up.
Motherboard and a Hard Drive any leads between them will fail before your motherboard or your hard drive if its a flat ribbon 40 pin type IDE replace it this will be the first to fail. Make sure your graphics card is securely seated with no dust built up or in the socket if you remove your graphics check the socket to make sure its dust free restart your computer then reinstall it this should activate found new hardware wizard Make sure all leads that are attached to your drives dvd\cd floppy have secure dust free connections and are not faulty or just replace them they could be faulty a computer needs Power and Data to travel through every working device and to continue its cycle and have an end so any faulty leads will end up with a computer error even something as small as a faulty power lead or fan lead can cause you problems computers need all of the data and electrical current to travel through every working device and to have an end to be able work properly Make sure ram modules and cmos batteries have dust free secure seatings and cmos battery has charge some motherboards cmos batteries are soldered in Check you CPU make sure its securely seated and has thermal grease Hope this helps.

Posted on Dec 10, 2012

6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 656 Answers

SOURCE: not booting

check ur mother board power supply check the FET check all the power lines from the smpswith respective of ground with any line short check which component is primerly conected to that line replace it check the FET power IC etc

Posted on Nov 29, 2007

  • 594 Answers

SOURCE: Mother Board Gateway MX6958

In order to help you I will need you to take the laptop completley apart and get the model number off the bottom of the motherboard. it will say either intel than numbers and letter or asus than numbers or letters. but we need the model number of your motherboard so we can get you the part number. Or can you give me the serial number off the bottom of the laptop and i can try to look up your information that way and get you the information you need to get the board.

Posted on Jan 06, 2009

  • 6 Answers

SOURCE: ASUS p5vdc-MX motherboard won't boot

The light is probably the power light which is ok, but from past experience it sounds like the board is dead for one reason or other. Is it still under warranty? If it is take it back to where you got it, with the purchase docket if you have it and talk to them about what you have tested and ask for a replacement. If it is out of warranty, try ebay or use to search for the same motherboard if you want to rebuild the system without having to reload windows.

Posted on Feb 09, 2009

  • 1684 Answers

SOURCE: E-Machine PC with only a green LED on MB on Boot attempt


We have repaired many of these systems. The board was damaged when the power supply shorted. You can get replacement motherboards at click on the link on the left side for motherboards and look for Emachine.

I hope this helps, if so please rate my solution.

Corporate Computer

Posted on Jul 16, 2009

  • 99 Answers

SOURCE: DR31PR Motherboard may have overheated and now does not work

I'd say your PC definitely overheated. Usually when a CPU overheats, the first things that fail are the capacitors on the motherboard, not the CPU itself. Most times, a failed capacitor is fairly easy to notice. They usually bulge out on the top and/or leak a brownish fluid. If you can tell that one or more capacitors is bad, it means you need a new motherboard, unless you have the right tools to test each capacitor and replace the faulty ones and no other components were damaged by the heat.

Posted on Apr 13, 2012

Testimonial: "Thanks Jason. I looked for damaged capacitors visually, but did not see any obvious bad ones. I am assuming there could be heat damage to the board that would not be visible. I am going to replace the motherboard and see what happens. Do you have any suggestions on where to get this motherboard?"

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

Compaq CQ1-1225 AIO Wont Start at all. Removed all components


Anti-Static wrist strap connected to ground source, and your wrist;

1) The jack your AC adapter plugs into on the motherboard, is the DC Power Jack.
Motherboard out of case, power to motherboard, take your multimeter and see if you are getting 19 VDC at the DC Power Jack's positive solder joint, on motherboard.

The center pin of the jack is Positive. (The inner cylindrical shell is Negative)
Follow the DC Power Jack's positive pin from the Center of the jack, to the motherboard.

You probably won't be able to touch your meter's Positive (Red) probe, to the DC Power Jack's positive pin under the jack; so touch it's solder joint on the opposite side of the motherboard.
(DC Power Jack should be soldered close to the motherboard, is why)

Of course also touch the Negative lead, (Black probe), of your meter, to the Negative, (Ground) solder joint for the DC Power Jack.

Getting 19 volts DC?

See if there is a cracked solder joint, for any of the DC Power Jack's pin connections to the motherboard.
ANY perceptible movement of the DC Power Jack on the motherboard, indicates a bad power jack, and may indicate a broken/cracked solder joint.
Center pin of DC Power Jack is loose? Bad DC Power Jack. Replace.

2) DC Power Jack is determined to be in good repair? No cracked/broken solder joints?
The next components in the power circuit on the motherboard, leading From the power jack, are P. MOSFET's.

Power MOSFET Wikipedia the free encyclopedia

More information using a prior solution,

Dv6000 power light does not come on any more

Check the links given.

3) The last thing that concerns me, although I probably should have listed it first; is the AC adapter you are using.
Concern is that it doesn't have the 'intelligent chipset' that matches the Compaq CQ1-1225 All-In-One desktop PC's circuitry.

AC Adapter For Compaq Presario All in One CQ1 1225 Desktop PC Charger...

Just my thoughts..........

Jan 15, 2015 | HP Computers & Internet

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

HP Pavilion DV2000 will not start when power button pressed

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

1) AC adapter:
General example,

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.

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),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,

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

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.


[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

Charging light wont come on

A) AC adapter (Charger) is bad.
Use a multimeter, and check it out.

[ DC Voltage.
Test plug of cable that plugs into laptop.
Positive (Red) probe lead of multimeter, to Center Hole of plug on AC adapter.
Negative (Black) probe lead touches outside cylindrical metal shell.
You should read close to 19.5 Volts (DC) ]

AC adapter checks out OK?

B) DC Power Jack is bad

[The DC Power Jack is the port on the laptop, that the AC adapter plugs into. On laptop may be marked DC_IN ]

Damage to DC Power Jack prevents laptop from charging, or running strictly off of the AC adapter.

Battery removed take a No.2 pencil's eraser, and see if you can gently move the Center Pin, of the DC Power Jack.
ANY perceptible movement means replacement of the DC Power Jack.

The pin itself may not move, and the entire jack moves.
The good news is the DC Power Jack is not soldered to the motherboard.
It is soldered to a separate, therefore replaceable, small circuit board,

Click to enlarge. In the photo the DC Power Jack is at the back on the right.
This is is what the DC Power Jack, looks like not installed on that small circuit board,

Looking at the view on the right, note the pins sticking out.
You are looking at the back view, and the jack is laying on it's side.
The pins go through the laptop's motherboard, and are soldered to the motherboard.

Where the pins are soldered to the motherboard is a solder connection. Commonly referred to as a Solder Joint.

Plugging in, and missing the hole of the jack, can cause the AC adapter plug to damage the DC Power Jack, by bumping into it.

Bumping into the plug of the AC adapter, while plugged into the DC Power jack, can cause damage to the jack.

Can cause cracking of the above mentioned solder joints. This leads to an intermittent contact, and eventually no contact, of the DC Power Jack TO the motherboard.

In this case the solder joints are just re-soldered.

Damage to the body of the jack itself means replacement of the DC Power Jack, or replacement of the USB/DC Power Jack circuit board, itself.

(Unless you, or an acquaintance can un-solder, and solder real well, the option may be to just replace the USB/DC Power Jack circuit board)

DC Power Jack proves to be OK?

Problem is one, or more Power MOSFETs on the motherboard.
These determine if the Battery needs a trickle charge, or a full charge, or no charge at all.
Also determines if the laptop is to just run off of the AC adapter, and not the Battery.

This example is for HP Pavilion dv6000 and Pavilion dv9000 series of Notebook PC's. You can use it for cross-reference information.
(Location of the Power MOSFETs on your laptop's motherboard. General idea of what they look like ),

What? Looks like motherboard replacement to you?
Let's price a Fairchild Semiconductor International - FDS6679 - Power MOSFET,

If you buy one the cost is $1.01 USD

Look to see if the Power MOSFET/s are burned. Blackened, bubbled, or blistered.

There is one more small component, that if bad will produce the same results;
Ceramic Capacitors.

Look back at the Mayohardware blog. Look at the second photo down with the AO4407 Power MOSFET circled in Yellow.

Note the small rectangular shape to the immediate right, that has the wide dark band on it. There is one above it, one above that, and one to the right of the top one.

See if any of these, (No matter what the size. Look at all of them), are burned. Blackened, bubbled, or blistered.

NOT stating these are ones to use. Just showing average cost.
.42 to .76 cents USD. Approximately a half dollar to three-quarters of a dollar.


Average example,

$200 USD

Average example of the -> package type of the Power MOSFETs used,

You don't need a Soldering Station. A low Wattage soldering iron, and that tip.


Oct 08, 2012 | Dell Inspiron XPS M140 Notebook

1 Answer

My Eee 4g surf netbook won't charge at all. Upon turning it on, it runs for a second, then shuts off due to a lack of battery power. The charge cable's light is also not turning, so that may

I think your DC Power Jack is bad. The DC Power Jack is where the power cord plugs into the laptop. If it is bad, then a good power cord cannot charge the battery, nor can the laptop turn on once the battery is drained.

You say it smelled burnt, that might mean it took a power surge. I always tell people that before your plug the power cord into the electrical outlet on the wall to remove the other end of the cord from the laptop. That way if you get a power surge you will only damage the power cord and not the dc power jack or motherboard.

Anyway, take an ink pen and push it into the dc power jack and see if there is some movement. The little pin or the casing of the jack should not wiggle.

The DC Jack is soldered onto the motherboard. To replace it you will have to take the laptop apart, desolder the old dc jack and solder a new jack onto the board. Sometimes the DC Jack sits in a slot rather than being soldered. The palmrest and bottom case helps to keep it in place. This type of DC Jack usually has a cable harness that plugs into the motherboard.

Apr 02, 2012 | ASUS Eee 4G Notebook

1 Answer

Presario v2000 Laptop dead.

Its may be the problem on ur psu or ur motherboard

Jul 28, 2010 | HP Compaq Presario V2000 Notebook

2 Answers

No light when charger connected to laptop.

You do not have to resolder the connection, the dc jack is attached to the motherboard via a cable and plug. You can purchase these on Ebay for under 20 bucks. Below is the link to the disassebly guide that will assist you.

This link here is for the DC jack...

This link is for the illustrated guide to removal of the motherboard.

Jul 27, 2010 | HP Computers & Internet

3 Answers

Hp laptop will not power 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:

Oct 26, 2009 | HP Pavilion dv9000z Notebook

1 Answer

Nc6320 external power problem

most case cause DC jack connection is not stable or damage
you may try
1) to open cover find out the DC jack 2 or 3 pins on the motherboard then to fix it use iron and flux.
2) check any disconnection DC/DC circuite near the jack
3) repleace the new jack if the jack damage

Oct 26, 2008 | HP Compaq nc6320 Notebook

Not finding what you are looking for?
Computers & Internet Logo

Related Topics:

1,574 people viewed this question

Ask a Question

Usually answered in minutes!

Top HP Computers & Internet Experts

Les Dickinson
Les Dickinson

Level 3 Expert

18390 Answers

Doctor PC
Doctor PC

Level 3 Expert

7733 Answers


Level 3 Expert

2600 Answers

Are you a HP Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides