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Dc on motherboard is missing, the plug. i could't find a replacement that fit in the board like the first one did, so i found one with the same voltage, but it has to be wired to the board.problom is i cant identifiy the + - and comon.theres just numbers on the board.its a hannstar j mv-4 94v-o motherboard can you get me a diagram of the board? or the definition for 1 , 2, 3, 4, 5, 6.

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  • ceedeekekic Mar 07, 2009

    just need a web site that will give detailed diagram of my motherboard.can u help?



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On my board it is written next to connector HW191D

Posted on Aug 02, 2014


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SOURCE: Need a new MV-220 inverter board, but cant find it anywhere!

It may be worth a shot, but before you give it a go, I'd scrounge up any info you can on your florescent backlight (power rating, input frequency, ect.) Take it out carefully and see if it has any markings.
Then you can use a multimeter to test the output of the MV176.
If you end up ruining the light you have, you could always try and obtain the MV176's bulb and attempt to install it along with the inverter.

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Go to to get new parts for your set.

Posted on May 26, 2011

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My laptop will not turn on

A) Power On switch is no good.
Power On switch is usually on a Power Button Board.

B) AC adapter (Charger) could be bad. Hasn't charged Battery either, so there is NO power going to the laptop.

AC adapter needs to be checked for output voltage.
It's DC output voltage, and voltage depends on laptop. Usually 15 Volts to 19.
If the laptop manufacturer name, and model number was stated, I could tell you.

C) DC Power Jack problems.
The DC Power Jack is the jack on the laptop (DC_IN), that the AC adapter plugs into.

DC Power Jack either is soldered directly to the motherboard, or has wires attached that end in a small male plug. Unplugs from motherboard to remove, plugs back in to install.

D) Bad Power MOSFET's on the motherboard.
Example using HP Pavilion dv6000 series, and Pavilion dv9000 series Notebook PC's,

The Fairchild Semiconductor Industries - FDS6679 - Power MOSFET is obsolete.
Cross reference example is FDS6679AZ.
Price is $1.01 USD,

Alpha & Omega LTD - AO4407 is also obsolete. Cross reference example is 78 Cents USD.

Post the manufacturer name and model number.
Model number can be found on bottom of laptop.

I ha-te giving generic one-size-fits-all information.

Post back in a Comment.

Mar 01, 2013 | Computers & Internet

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

M5010 bad DC board or motherboard?

Try swapping out the ram one at a time to make sure one stick is not bad because this will prevent startup. Next check DC plug on motherboard and resolder points if you are handy with a soldering iron, a common problem. In rare cases I have found the power supply charger defective will put out the proper voltage when tested but drops when a load is applied. The last thing you can try is remove the hardware one at a time, if no change motherboard will need to be replaced.

Mar 01, 2012 | Dell Inspiron 15R Notebook

2 Answers

The inside power plug for Toshiba laptop is broke. The estimated cost for replacing the plug is $300.

Or, for $399, you can go to Walmart and get a new Toshiba laptop.

The reason it costs so much is the labor involved. To repair this break, it literally requires a complete disassembly of the laptop, replacing and soldering on the connector, then reassembling the laptop. Laptops, unlike desktops, were not made for easy service, due to the fact that they're trying to pack 10 pounds of stuff in a 2 pound box, for lack of a better analogy.

It's a lot of work to fix it.

Jul 06, 2011 | Toshiba Computers & Internet

1 Answer


The DC jack, where you plug the power adapter cable, might be loose or defective, & needs to be either re-soldered or replaced.
In order to do this, the laptop needs to be disassembled & the motherboard taken out. Also, the motherboard needs to be checked for defective/burned out components in the area near the DC jack. Any defective/burned out components found should be replaced, or you might need to replace the laptop's motherboard altogether.

Aug 31, 2010 | Sony Computers & Internet

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

2 Answers

Bad AC adapter port


The majority of HP laptops I've worked with have had the DC socket "on-board".

But, don't worry about having to replace the whole motherboard as you can now purchase an new DC socket for the laptop and solder it in yourself. Or you can just take the laptop to a reputable PC repair store and have them fit you a new DC socket.

This is a very common problem with all makes and models of laptops (except Apple Mac's) and i have replaced plenty of them.

Please post back if you need anymore help.


Jan 14, 2010 | HP Compaq Presario V2000 Notebook

1 Answer

Bad motherboard for M1730

With the Dell laptops, if it were a broken power jack you would know by looking. It would show signs of missing/broken solder around the solder points. You could do a continuity test with a Volt/Ohm meter. However this would be tough with the barrel plug dell uses.

Now as far as getting someone to repair it for you. Iwould recommend a guy I use in florida. I originally found out about him on Ebay, he does a great job repairing motherboard issue (on the component level). He has ALL the proper equipment to ddo this. I have provided a link to his Ebay contact page. Send him an email, I am sure he can fix ya up.

May 19, 2009 | Dell Inspiron XPS M1730 (N09X7304) PC...

1 Answer

Gateway 200arc motherboard problem

If there are two wires running from the power button on your case to the motherboard, take them off and try jumpering those two terminals with a jumper or something that will make contact for just a second and them take back off. Your power button may have fried along with the power supply.

May 18, 2009 | Gateway Refurbished $30 P1 TO USA - BOARD...

1 Answer

I need to replace the DC jack on my laptop

Do Not Attemp to Replace the Jack Unless You Have Experience with Soldering... The Original DC Jack Must First Be Desoldered and Removed... You Need A Desoldering Pump or Solder Wick (braid) To Remove the Old Solder From The Jack Post Pins..... DO NOT ATTEMP TO RIP OUT THE OLD JACK!!!!! You Will Pull The Contact rings from the center of the motherboard out and render the motherboard useless...

Slowly and carefully Unsolder the dc jack, Remove it and Clean the board.... Very Important to Clean the Motherboard after desoldering the old jack.... You Must Remove all old Flux...

Then Apply a light layer of fresh solder to all the contacts on the motherboard....

Apply Flux paste to the New DC Jack Pins and a light amount onto the contacts on the motherboard....

Insert the new DC JAck Into The Slots and Apply Solder to all points on the underside of the motherboard....

Flip The Motherboard Back Over, To THe Side Where THe DC Jack Is,, and Apply Flux then a light amount of Solder To The Side Pins and Back Power Pins ...

Then Clean the Motherboard off again using an Electronics grade circuit board cleaner (found at radio shack) or a tiny amount of denatured alcohol applied to a paper towel .. THe Purpose is to remove any remaining Flux..... as this will just deteriorate the New Solder over time unless cleaned off...

Good Luck

Nov 17, 2008 | Computers & Internet

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