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HP Pavilion dv8 not starting up

Power jack lit but not the middle of the 3 led lights at bottom left of case. I have tested the power switch board by sub with an identical 2nd comp and is good. On first power on attempt the power switch led flashes along with the speed bar lights then nothing. Further attempts or holding down power switch for 5 secs or more has no effect.

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  • Computers & ... Master
  • 5,660 Answers

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

Posted on Dec 11, 2012

  • makemeacoffe
    makemeacoffe Dec 13, 2012

    Thanks for the comprehensive help. I have striped the m/c down and chercked the power jack which seems to be ok and also by using a fully charged batt from an identical comp. So unfortunatly i thik it is the system board and the peskey MOSFET's which are prob the culprit's i will get it 's condition tested.

  • joecoolvette
    joecoolvette Dec 14, 2012

    You're welcome, and thank you for the rating!

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Need emachines t3306 motherboard connection diagram


The eMachines T3306 desktop computer, uses the FIC K8M-800M motherboard.
First International Computer, (Inc)

http://www.fic.com.tw/product/motherboard/amd/ficimages/k8m-800m.jpg

http://www.fic.com.tw/product/motherboard/amd/k8m-800m.aspx

Here's the download page for the motherboard manual,

http://www.elhvb.com/mboards/OEM/eMachines/manuals/index.html

Column in middle, 3rd file from bottom.

This is a Zip file. A Zip file is a Compressed file. Used to send large amount of information more easily.
Has to be decompressed, or 'unzipped'.

After you click on the blue -> FIC K8M-800M file name, a small window will come up-
Opening K8M-800M_manual.zip

Make SURE there is a Green dot in the small circle, to the left of Save File.
IF not; click in the empty circle to the left of Save File.
No go below in the small window, and click on OK.

A small download window will come up.
Allow the file to fully download all the way, then DOUBLE-click right on the file name.
(Yellow folder icon with a zipper on it. K8M-800M_manual.zip is to the right)

In the next small window go to the far Left, and click on -
Extract all files.
At the bottom of the next 3 small windows click on Next, Next, and Finish.

In the last small window DOUBLE-click right on the file name ->
K8M-800M_manual
(Next to the red Adobe PDF icon)

There is your motherboard manual in PDF file form.

For an example;
The front of your computer is the Front Panel.

The area of contact pins on the motherboard, that the Main wires from the Front Panel go to; is the Front Panel header.

Motherboard installed in computer case, the Front Panel header is at the Bottom/Right.
The Front Panel header is Orange in color. (Page 20)

Two rows of contact pins.
5 pins across the Top row.
4 pins across the Bottom row.

The Top row is numbered ODD.
The Bottom row is numbered EVEN.

Starting on the RIGHT side going across to the Left; Top row,
Pins 1, 3, 5, 7, and 9.

Starting on the RIGHT side going across to the Left; Bottom row,
Pins 2, 4, 6, and 8.

A) Pins 1 and 3 are for the HarDDrive activity LED light.
Pin 1 is for the Positive ( + ) wire.
If the HDD LED is dim when the Harddrive is active, switch the wires around.

B) Pins 5 and 7 are for a Reset switch, IF a Reset switch is used.

C) Pin 9 is N/C. Not Connected.
Reserved for factory use. Probably a 5 Volt test point.

D) Pins 2 and 4 are for a Power On LED light.
These two pins are used for a Single color, Power On LED light.
Two wire LED light.

Pin 2 is for the Positive ( + ) wire.
If the PWR LED is dim when the computer is on, switch the wires around.
There is ALSO a jumper used for this LED light. More on it at the end.

E) Pins 6 and 8 are for a Power On switch.

To the Right of the Orange Front Panel header, (F_PNL), is the PW_LED header.
[Page 20 to right of Front Panel header. -> PW_LED
(Power LED, 2/3 Pins) ]

3-pin Black header. Sits Vertically.
(The Orange - Front Panel header, sits Horizontally)

This is used for a 3-wire Power On LED light.
Used for a Dual Color - Power On LED light.

One example is if the computer has Turbo Mode, and Normal Mode.
Green color usually for the Turbo Mode, Yellow color of the LED for the Normal Mode.

Starting from the BOTTOM going UP;
Pins 1, 2, and 3. (3 at the Top)

A) Pin 1 is for the Positive ( + ) wire. [Signal]
B) Pins 2 and 3 are for the Ground wires.

Jumper block for the 2-wire Power On LED light, and 3-wire Power On LED light; Page 13 - Set System Jumpers
(Actually it starts on Page 12)

6-pin header to right, of 3-wire Power On LED header.
Has Blue jumper caps on it. Two of them.
(PL_LED1)

http://www.ebay.com/itm/NEW-FIC-uATX-Skt-754-AMD-Desktop-Motherboard-VIA-K8M800-AGP-4x-8x-DDR400-800FSB-/280923928691?pt=Motherboards&hash=item41685ef873

Two rows of 3 pins.
The Top row is numbered ODD.
The bottom row is numbered EVEN.

Starting on the RIGHT side going towards the Left; Top row,
Pins 1, 3, and 5.

Starting on the RIGHT side going towards the Left; Bottom row,
Pins 2, 4, and 6.

A) With the jumper caps on Pins 3 and 5; plus 4 and 6; the Power On LED light works as a Single color LED.

B) With the jumper caps on Pins 1 and 3; plus 2 and 4; the Power On LED light works as a Dual color LED.

For additional questions please post in a Comment

Regards,
joecoolvette

Mar 07, 2013 | Computers & Internet

2 Answers

HP Pavillion dv6700 - won't power up


Hi have you tried to power up without battery?

Feb 16, 2013 | HP Pavilion Computers & Internet

1 Answer

HP Pavilion dv8 not starting up


For this kind of issue, please follow up the following steps to check:

1.confirm the battery and ac adapter connect the laptop normally.Maybe the bad connect lead to this problem. If there are no lights when you turn on laptop, one of possible reason is that your adapter is malfunction.

2.the second possible cause is laptop dc jack failure. If the dc jack is broken or loose, you are required to replace it or repair it.

3.Another possible reason is that there is something wrong with laptop motherboard. For this situation, it includs two kinds of possibility,a failure in an electronic circuit and BGA malfunction.

For more detailed reasons and solutions, please have a look at the following article:http://www.ifitjams.com/lappower.htm

If you verify your laptop adapter is dead and you plan to order a new one, I recommend one for you on the basis of your laptop model:
http://www.chargerbuy.com/replacement-hp-pavilion-dv8000-ac-adapter-18-5v-4-9a.html

Dec 10, 2012 | HP Computers & Internet

1 Answer

How to connect power switch to mother board


http://www.intel.com/support/motherboards/desktop/dg41rq/sb/CS-029925.htm

Click on -
Intel Desktop Board DG41RQ Product Guide - English (PDF)

Bookmarks menu to the left -

1) Click on the + sign to the left of -
1 Desktop Board Features
Click right on - Desktop Board Components
Or go to Page 11. (Adobe Reader page number box at top)

Front Panel header location marked by P, in the figure.

2) Click on the + sign to the left of -
Connecting to the Internal Headers and Connectors,
in the Bookmarks menu.

Click on - Front Panel header

Motherboard mounted in computer case, the Front Panel header is in the bottom/right corner, above the top black SATA connector.
Two rows of contact pins.

The Top row is numbered EVEN.
Starting at the Left side going across to the Right, Top row;
Pins 2, 4, 6, and 8. There is NO pin 10.

The Bottom row is numbered ODD.
Starting at the Left side going across to the Right, Bottom row;
Pins 1, 3, 5, 7, and 9.

A) Pins 1 and 3 are for the HarDDrive activity LED. (Light)
Pin 1 is for the Positive wire.
If the HDD LED is dim when the harddrive is active, switch the wires around.

B) Pins 5 and 7 are for a Reset switch, IF a Reset switch is used.

C) Pin 9 is N/C. Not Connected. Probably 5 Volts DC for factory testing.

D) Pins 2 and 4 are for the Power On LED. (Light)
This IS for a -> 2 wire LED. (Light)
Pin 2 is for the Positive wire.
If the PWR LED is dim when the computer is on, switch the wires around.

E) Pins 6 and 8 are for the Power On switch.

To the left of the Front Panel header is a 3-pin header.
This is the Alternate Front Panel LED header.
If you have a -> 3-wire LED, it connects here.

Also wanted you to have the motherboard manual.

Regards,
joecoolvette

Nov 04, 2012 | Intel DG41RQ Motherboard & Core 2 Duo...

1 Answer

Front panel configuration


Motherboard installed in computer case;
Processor to the Top, 3 Ram Memory slots to the Right, 5 white PCI slots to the Bottom;

Down in the Bottom/Right corner, is JFP1, and JFP2.

The Front Panel header is JFP1. (Junction Front Panel 1)
The header with two rows of pins, and is positioned Horizontal. It is parallel to the bottom of the motherboard.

(The other Front Panel header is JFP2. It is positioned Vertical, and is above JFP1. You may be using it also. Read on)

There are two rows of pins for JFP1.
5 across the Top, 4 across the Bottom.

The pins on the Top row are numbered ODD.
The pins on the Bottom row are numbered EVEN.

Top row, starting from the Right side, going towards the Left;
Pins 1, 3, 5, 7, and 9.

Bottom row, starting from the Right side, going towards the Left;
Pins 2, 4, 6, and 8. There is NO pin 10.

A) Pins 1 and 3 are for the HarDDrive activity LED light.
Pin 1 is for the Positive ( + ) wire.
If the Harddrive activity LED light is dim, when the harddrive is active, switch the wires around.

B) Pins 5 and 7 are for the Reset switch, IF a Reset switch is used.

C) Pin 9 is N/C. Not Connected. It is/was for the factory.

D) Pins 2 and 4 are for the Power On LED light. A Power On LED light that has 2 wires.
Pin 2 is for the Positive ( + ) wire.
If the Power On LED is dim when the computer is on, switch the wires around.

E) Pins 6 and 8 are for the Power On switch.

Looking at JFP2. (Junction Front Panel 2)
Vertical with two columns of pins.
3 on the Right side, 4 on the Left side.

The Right side is numbered EVEN.
The Left side is numbered ODD.

Starting at the Bottom on the Right side, going Up;
Pins 1, 3, and 5.
Starting at the Bottom on the Left side, going Up:
Pins 2, 4, 6, and 8.

A) Pins 1, 3, and 5, are for a Power On LED light, that has 3 wires.
Pin 1 is for the Positive wire. (Dual color LED )

B) Pins 2, 4, 6, and 8 are for a Speaker. The speaker for BIOS Beep Codes.
Pin 2 is for the Positive ( + ) wire.
Pin 8 is for the Negative ( - ) wire.

Regards,
joecoolvette

Jun 24, 2012 | MSI MS-6580 Motherboard

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The audio driver on my computer went out.. and ive gone online to download the audio driver.. but it doesnt work at all.. like, i can download it.. but then it wont open.. and ive tried opening it with...


Did it download as a .zip(compressed) file? If so, you will have to uncompress;unzip; or extract the file before it will work...you should get a prompt asking if you want to run,ect.

Mar 07, 2010 | HP Pavilion dv8000t Notebook

1 Answer

I have an HP Pavilion ze4200. It will not even


1. It looks like a battery problem!

2. Plug in your laptop to fully recharge the battery!

3. After 3-6 hours, try to start your system!

4. You can also check by changing the power jack / socket!

5. Is the battery light On / blinking ?

Jan 04, 2010 | HP Pavilion ze4220 Notebook

1 Answer

Hp pavilion dv5-1002nr will not power up


Let's run through a basic flow chart.

1.Plug the AC adapter, (Charger), into the laptop.

Is the Power LED light on, and the Battery charging light?

[The Power LED light is on the front edge of your laptop, all the way to the left.

There are three small rectangular LED lights in this area.
1) All the way to the Left - Power LED light.
2) In the middle - Battery Charging LED light.
3) On the right - Harddrive Activity Lamp {Light}
The HDD Activity lamp blinks when harddrive is in use]

Gently wiggle the AC adapter plug, that is plugged into your laptop.

Does the Power LED light and/or Battery Charging light, 'Wink' when you move the plug? (Blink)

Does it stay on when you keep it over to a certain position?

If so, you have either a bad plug on the end of that AC adapter cable, wires that are bad in the cable itself, or a bad DC Power Jack.

(The DC Power Jack, is the port where you plug the AC adapter in. May be labeled as DC IN)

Do you wish to test the AC adapter plug?
See if it has an intermittent connection, due to a break in the wires that meet the plug?

And/or, see if the AC adapter is putting out any voltage, and if so, the correct amount of voltage?

Do you have a multimeter?

A cheap, yet effective multimeter, can be purchased for around $10 to $12 at most auto parts stores. (Radio Shack has them, and a multitude of other stores also. Not an advertisement for Radio Shack)

Set the multimeter to DC Volts, (Turn the knob in the front), and if it has a separate setting, set it to DC Volts - 50 Volt scale.

Read the label on the AC adapter's case. You are looking for the OUTPUT voltage/amperage.

Example:
I'm looking at an Acer Aspire laptop's, AC adapter right now.

INPUT: 100 - 240V ~ 1.8A - 50/60Hz
OUTPUT: 19V === 3.42A

The Output voltage is 19 Volts.

AC adapter plugged into the surge protector.
The Red lead, (Positive), of the multimeter, (Right now it's being used as a Voltmeter), is inserted into the middle of the AC adapter plug.

The center of the plug is the Positive connection.

The Black lead, (Negative), is held against the outside of the AC adapter plug. The round cylinder of the plug on the outside.

This illustrates the AC adapter,

http://www.buy.com/retail/product.asp?sku=213337465&listingid=63465880

The photo shows the AC adapter charger body, attached to the cable with the plug.
To the top left you see the plug, and the shiny metal cylinder. The Black lead touches the outside of the cylinder.

Read whether you are getting voltage, and the proper amount of voltage.
Gently wiggle the plug back, and forth, and see if there is a break.
Voltage, no voltage.

If the AC adapter proves to be good, you have a problem with the DC Power Jack. (DC IN)

The DC Power Jack is on the right side, all the way to the rear.

The setup, and mounting for this DC Power Jack differs from most laptops.
Most laptops have the DC Power Jack soldered directly to the motherboard, or are soldered to a separate small circuit board, that plugs into the motherboard.

This jack has a cable leading from it, and the jack attaches to the bottom case of the laptop, via a small bracket.

To illustrate what I'm referring to here, you may want to download, (Free), the Maintenance and Service Guide from HP Support.

http://h10025.www1.hp.com/ewfrf/wc/manualCategory?lc=en&dlc=en&cc=us&product=3753576&lang=en&

(Just click on the X, of the small survey window that comes up)

On this page Left-click on -
HP Pavilion dv5 Entertainment PC - Maintenance and Service Guide
(10th file down. This is a PDF file. The computer you are on now has Adobe Reader on it, which uses PDF files)

Give it a few seconds to download. It may take up to 20 seconds before you see the first page.
I advise wait, until it has fully downloaded before looking through it, or you may break the download connection.

Under the Bookmarks column to the left, click on the + sign next to - Removal and replacement procedures

Click on the + sign next to - Component replacement procedures

Scroll down, and click right on - Power connector cable

(Or use the blue down arrow above to go to Page 96)

Point of this?
If you are technically inclined, you could disassemble the laptop, and replace the Power connector cable.
The DC Power Jack is part of the Power connector cable.

[BUY and USE an ESD wrist s-trap. Connect the alligator clip to a good ground source. I use an empty desktop computer case, and connect to the metal frame.

Average cost is around $6 for this device. Can be found in a multitude of stores. Again, Radio Shack is one source, but there are many.

Use a multi-compartment container for the various screws you will remove. Label each compartment for the area the screws came out of.
You can use a clean egg carton in a pinch.

Make notes, and drawings as you disassemble. Use a digital camera if you have one available.

Check with HP to see if this part is available. I also would check online, and you may want to give thought to Ebay]

2. If the Power light stays on with no intermittent problems with the DC Power Jack, or the AC adapter:

A.There may be a problem with the Power On switch itself. (Under the Power On button)

B.The Ram Memory modules, (Slang is Stick), may have become jarred loose.
AC adapter unplugged, battery removed. Open the Memory Compartment, and remove all ram memory modules. Now reinstall them.

Reinstall the Battery, and then the AC adapter. (Then plug the AC adapter into the surge protector)

Power On the laptop.

C. The Harddrive might not have a good connection.
All power sources removed again, open the Harddrive, (HDD), Compartment.
Make sure the harddrive's plug is tightly connected.
(Page 62)

D.If none of the above cures the problem, then it's time to seek a professional, competent computer repair shop.

The charging circuit of the motherboard may be bad. There is a sensor that determines if power should come from the AC adapter, or the battery.
It also determines if the battery needs charging.

You may have harddrive failure.

[Again, if the shop does determine it to be a bad motherboard, AND you feel technically inclined, you may want to replace the motherboard yourself.

Check online, and also Ebay]

Dec 16, 2009 | HP Pavilion dv1000 Notebook

1 Answer

ZV500 power plug problem


I've repaired alot of laptops... One thing that I found works the best is get 3 bowls or dishes.... Label them; 'Top', 'Bottom', and 'Logic'. Almost all laptops require you start disassembly at the base of the unit. Unscrew every single screw you see, make sure there are none left before you start on the top. The way alot of laptops are set up is that you unscrew the bottom, pop off the top casings/covers then unscrew the top screws. Once you've removed all the screws from the top and the bottom, there will be very little attaching the casings, so be careful. Remember to Unplug everything you see attached to the logic(mother) board, or you risk ripping a fixture off the board. Once you have freed the logic(mother) board from the attachments and casings you should very careful.

Now as you start work on the power jack, I Highly recommend you use a solder wick and flux to remove any solder left on the board from the previous repair. It is never a good idea to leave old solder on the board. You should be careful with the solder you don't want to short anything out by using to much solder. Once you have finished your repairs to the DC jack you should test it out plug it in to the AC Adapter and look for any visual indicators of life(i.e. charge batt light).... So now you know it works.

If you get it back together and it suddenly doesn't work its possible you have a case short. If thats the case look on the metal casing for any discolorations or blackness and if you find any place some electrical tape over it... it should be fine.

Good Luck. Don't be nervous its not as hard as it seems.

Hope this helps lemme know if you have any questions.

Sep 14, 2008 | HP Pavilion dv6000z Notebook

1 Answer

My wirless is not working


The wireless switch is located just behind and to the left of the wireless LED. The wireless LED is located on the left of the bottom half of your laptop looking from the front between the battery, power and harddrive LED's and the audio jack sockets.

Aug 03, 2008 | HP Pavilion dv9000z Notebook

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