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The jack end of the ac adapter (plug into the

The jack end of the ac adapter (plug into the keyboard) is loose and off center. The unit will not power on. What can I do to the plug to tighten the fit of the jack?

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The jack has probably been ripped loose from the circuit board by repeated use over time. The jack must be de-soldered, then epoxy glued to the circuit board. Once the glue sets, the original connections need to be replaced with short sections of wire to bridge the broken portions of printed circuit. A relatively simple repair if done carefully. Hope this helps!

Posted on Apr 30, 2010


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Keyboard AC Adapter

If thje voltage is the same, the current rating is fine at 1000-1400 mA. The accessory will use the amount of current it needs and the fact that there is more "available" does not mean it will use it. The higher current rating will not ruin the equipment. Just make sure the voltage rating is the same. Cheers!

Mar 09, 2014 | Casio AD5 Keyboard AC Adapter

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Correct adapter for casio wk 500

Casio AD-12 for my country with 240V

You may use any 12V 1A AC Adaptor that has the same DC jack provided the center is NEGATIVE. Most common generic AC Adaptors are Centre POSITIVE.
So cut DC end of the wire and solder them in reverse and insulate with tape and it will work.

Jan 20, 2014 | Casio Lighted Keyboard LK90STADMC

2 Answers

I lost my adapter to my keyboard and I need to find either a substitute or a new way to turn it on without the adapter, HELP!!!.

Some Casio Keyboards use 9V DC (center negative) others 12V DC (center negative).
If check what voltage your Keyboard use. Generic AC adapters are usually center positive. So you have to invert the wire with a new DC plug to make it center negative,
Easiest is to buy a Casio ac adapter made for your keyboard from a Casio retailer.

Sep 12, 2013 | Casio Keyboard Power Adapter

1 Answer

Screen doesn't come on power indicator light on when plugged in, any suggestions?

1) Unplug AC adapter (Charger) from surge protector strip. Unplug AC adapter from laptop. Plug AC adapter back into power, then plug back into laptop.


Then the AC adapter needs to be checked.

The AC adapter converts high 100 to 240 Volts AC, from your home or business; into 19 Volts DC. (19VDC)

Looking at the AC adapter example above, the plug end that plugs into the laptop; has two connections;

1) The Center Hole is the Positive connection.
2) The outside cylindrical metal shell is the Negative connection.

Using a multimeter to check;
Set the Function knob to DC Voltage. If just a symbol, the symbol is a dotted line over a solid line.
If there is more than one DC Voltage scale, set the Function knob to the 0-50 Volt DC scale. (0 to 50 Volt)

The Positive (Red) probe lead goes to the Center Hole.
The Negative (Black) probe lead goes to the cylindrical metal shell.
You should be reading 19 Volts (DC)

Have an assistant gently wiggle the cable FROM AC adapter TO laptop.
Also have the assistant gently wiggle the power cable FROM surge protector TO AC adapter.
Fluctuation in reading on multimeter; indicates a broken wire, in one of those cables.

Replace AC adapter if so.
Not 19 Volt reading? Replace AC adapter.

[An economical multimeter can be purchased, for as little as $5 to $12. An auto parts store is but one place to puchase one. I have seen them on checkout aisle racks, in major discount stores.

I can guide you step by step with it, if you post the manufacturer name, and model number of the multimeter.
Skittish about measuring the voltage? Worried about shock?
I understand. However, I wish you to know that two D cell flashlight batteries, store 3 Volts DC. You will be measuring for 19 Volts DC.

Or take the AC adapter to the nearest small computer shop. The resident tech should only charge a couple of bucks, to test it for you]

AC adapter checks out?
Then the diagnosis goes on.
(Or you may wish to skip to the next step, and perform it first)

DC Power Jack:
The DC Power Jack is the jack on the laptop, that the AC adapter plugs into.

Looking at the photo of the motherboard, you are looking at a Bottom view. The Processor, and Ram Memory are on the Bottom of the motherboard.

There are two silvery looking ports, on the BOTTOM/Left corner.
The one all the way to the Left, is the Ethernet port.
Next to it on the right; is the DC Power Jack.

Another look at the jack not installed;

Great! Can't find an exact listing for an Everex NM3500w DC Power Jack.
However the above example mounts the same. The connecting prongs (pins) on bottom, may be in a different pattern, though.

Click on the photo to enlarge.
This shows a bottom view of the jack. The rounded tipped prongs go through holes in the motherboard, and are soldered on the opposite side.

The prong all the way in the back of the jack, left side; goes to the Center Pin. The Center Pin is the Positive connection.
The prong coming up from it in the middle, is for the Negative connection. It goes to the contact/s surrounding the inner hole, in the jack. (Inner hole around the Center Pin)

Battery removed, AC adapter removed; see if you can gently move the Center Pin, using an eraser on the end of a No.2 pencil.

ANY perceptible movement means the DC Power Jack needs to be replaced.
If it seems the entire jack itself moves, problem may just be a cracked solder joint, or joints. Or may be a bad power jack.

A cracked solder joint will make an intermittent contact, or No contact at all; of DC Power Jack TO motherboard.
Battery will not receive power, laptop will not turn on.

Power On LED indicator is on? Means nothing really. Uses way less than 1 Watt of power to light that LED. (Light Emitting Diode)
A cracked solder joint could allow that much power, but not enough to turn the Processor on.

DC Power Jack seems fine, from this simple cursory test?
You really have to disassemble the laptop, remove the motherboard, and check; to be sure.

See if by gently wiggling the Body of the DC Power Jack, if there is any perceptible movement.
Use a bright light, and magnifying glass; to carefully scrutinize for a cracked solder joint.

AC adapter checks out? DC Power Jack checks out? Next in line are the Power MOSFET's.
Now we are talking board level component replacement; (SMD's), Or motherboard replacement.

Using the HP Pavilion dv6000 series, and Pavilion dv9000 series of Notebook PC's; for info about Power MOSFET's in the charging/power section, of the laptop's motherboard. (DC to DC Circuit),

Cost exceeds repairing laptop feasibly, and you need to retain the information on the Harddrive?
Suggest removing harddrive, and installing in an economical external enclosure.

The harddrive resides in a Harddrive Caddy. A sheet metal enclosure. Then both are installed in the laptop. The sheet metal Harddrive Caddy is removed, so the Harddrive can be installed in the external enclosure.

Don't know what technology the Harddrive uses.
Do not know if it is an IDE (PATA) unit, or a SATA unit.
DO KNOW that it is a laptop harddrive, and will be 2.5 inches across in Width.

(2 and 1/2 Inches)

Once the Harddrive is removed, you can look the model number up on the internet, and see if it is an IDE, or SATA unit.

[IDE is referred to as PATA also. Parallel ATA.
SATA is Serial ATA, ]

You can also post back here with the Harddrive's model number, and I can find the information out for you.

IDE (PATA) example;

(Scroll down)

SATA example,

Scroll down)

Reviews I found on the 'net were few, and lacking. One's for sale on places like Ebay, give sketchy information on what the laptop even looks like.
However I believe I can guide in disassembling, if you wish.

For additional questions please post in a Comment.

Jan 06, 2013 | Everex Stepnote Nm3500w 15.4" Laptop Intel...

2 Answers

The adapter light is on when first plugged in but then when I connect the adapter to my laptop the light goes off and it doesnt supply any power

I suggest check out the AC adapter first.

1) When plugged into power, and plugged into the laptop, gently wiggle the cable from the AC adapter TO laptop.

Any change?

Do the same on the power cord TO AC adapter.

Go on.

2) The port on the laptop that the plug from the AC adapter plugs into, is the DC Power Jack.
If we are discussing an Acer Aspire 5738Z Notebook PC, the DC Power Jack resembles this one, (Not installed),

(When I note the DC Power Jack, it is this link I will be referring to )

As you can see there is a Center Pin. All power removed from the laptop, use a small wooden, or plastic object, and see if this pin moves around.

ANY perceptible movement means a bad DC Power Jack.

DC Power Jack checks out it's back to the AC adapter.
Wanted to perform the easy diagnosis first.

This will require a multimeter. An economical, yet fine for this test multimeter, can be purchased for as little as $8 to $12.

Available in a multitude of stores. An auto parts store is but one example.
Analog or digital is fine.

(Analog is fine. Some of us still like 'em)

DC Voltage is what you are going to check.

Black probe lead (Negative) goes in the Common port on the multimeter. (COM)
Red probe lead (Positive) goes in the Voltage port on the multimeter. (V)

If the multimeter just has symbols around the Function Knob, set it to the dotted line over a solid line, symbol.

The plug on the end of the AC adapter, that plugs into the laptop, has a center hole, and a cylindrical metal shield surrounding it.

The Center Hole of the plug is where the red Positive lead, of the multimeter goes.

The outside cylindrical metal shell is where the black Negative lead of the multimeter goes.

Hold the AC adapter plug in one hand, and at the same time hold the red Positive multimeter probe in the center hole.

With the other hand touch the black Negative lead of the multimeter, to the cylindrical metal shield on the outside of the plug.

You should read 19 Volts (DC), or VERY close to it,

I believe the AC adapter is the problem. Post back in a Comment as to your findings.


Apr 29, 2012 | Acer Aspire 5738Z-423G32Mn Notebook

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,

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.



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

HP Support > Pavilion dv8309us Notebook PC > Manuals,

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.


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

1 Answer

Laptop won't power on with ac adapter or battery

Could be a combination of things.

1) Battery is low. Not enough power to turn the laptop on.
Caused by;

2) AC adapter has a plug on the end of the cable. The plug plugs into a DC Power Jack on the laptop.

The DC Power Jack is bad.

2a) The DC Power Jack has a bad connection to the motherboard, (Cracked solder joints), and/or the jack itself is bad.

2b) Center Pin is loose in the jack's mount.
The back of the Center Pin where it mounts has become loose.

2c) The plastic body of the jack, which composes the jack's case, is cracked. This allows movement of the Center Pin.

2b, and 2c cause a bad connection with the AC adapter plug.

No charge to the Battery, no power to the laptop.

[ If this is the case the DC Power Jack needs to be resoldered to the motherboard. The cracked solder joints need to be re-melted, (Reflowed)
Entire laptop needs to be disassembled down to the bare motherboard in your hand.
(No Processor, Ram Memory, or any adapter cards mounted to the motherboard. Nada)

The DC Power jack needs to be replaced.
This entails disassembling the entire laptop, down to just the motherboard in your hand. (Same as above)

The old DC Power Jack is de-soldered, and a new one soldered in place.

Very FEW computer repair shops have the necessary skill level.
They just want to replace the entire motherboard.
IF one is available.
More Ka-Ching for them also. ]

3) The AC adapter is bad.
Not providing power to the laptop, to charge the Battery, nor give power to the laptop without the Battery.

AC adapter cord from adapter to plug, which plugs into the laptop, (DC Power Jack), may have a break in it.

May be an intermittent contact provided by wiggling the cord.
If this is the case the wires have stretched, and broken.
Wiggling causes the wires to briefly touch, and make contact.

Where this cord meets the plug itself. A lot of times there is a break in the wires in this area.

Solution is to replace the AC adapter. There are universal AC adapters you can buy, or perhaps Gateway still has some for sale.

Oct 21, 2010 | Gateway MX6920 Notebook

1 Answer

Faulty connection for AC power adapter on an 8 month old yamaha digital keyboard psr-e413

If the adapter is faulty I recommend replacing it with the exact one for your keyboard. Any Yamaha music dealer should have one. If it is the jack in the keyboard that the adapter plugs into that is faulty it can be fixed. It is soldered to the circuit board and the solder joint has likely failed. You will have to carefully disassemble the case and maybe take the circuit board out if the solder side isn't accessible. Once you can see the solder joint wiggle the jack to see where the break is. You will need to resolder it. If the jack is broken ( the center pin in the jack sometimes breaks) you will have to desolder it and take it to a good electronics store to obtain the correct replacement and then solder it in.

Aug 23, 2010 | Music

3 Answers

Won't accept AC

A couple things to check. In most cases the AC adapter itself fails and needs to be replaced.
  1. If there is another D series AC adapter available, try the system with it and see if the system works. If it does, replace the AC adapter.
  2. If no known good adapter is available, see if the AC adapter is putting out around 19 Volts DC at the connector that would normally plug into the system (Ground is outside of plug, + is the inside not the pin in the center) If you have no power detected, replace the adapter.
  3. If the LED on the AC adapter is not on when disconnected from the system but plugged into the wall, replace the adapter.
  4. If the LED goes out when plugged into the system or the DC jack on the system is loose, then you most likely need the jack replaced or the motherboard replaced both are about $100

Dec 10, 2009 | Dell Latitude D600 Notebook

1 Answer

Will not jumpstart

To recharge this unit at home use the AC charging adapter. Plug one end of the adapter into the AC/DC charger input port. Which is marked as number 7 on the image below. Then plug the other end of the adapter into a standard wall outlet. The charging port is located on the front of your power center and looks like the image below. If you did not get an AC charging adapter with your power center check the manual to see exactly what type you need. You will need to know the Voltage and AMPs of the adapter. Go to Radio Shack or an electronics store and purchase an adapter. It is very important that you make sure you get the right one. Your manual should tell you how many hours it takes to completely charge your power center.


Mar 13, 2009 | Power Center Jumpstart 11-411

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