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AC Power when plug the ac to use my laptop, after it's charged and the laptop's still on it goes back to draining the dc. How do I make it continue using ac while plugged in?

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Re: AC Power

Try removing the battary when it's fully charged and leave it out until you need to use it.

Posted on Nov 16, 2007

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Laptop is turning on and off

Remove the AC adapter (Charger)

PROPER method is to disconnect the power cord of the AC adapter, from power; THEN unplug the AC adapter from the laptop.

Same thing in reverse to plug the AC adapter back in.
AC adapter is plugged into laptop, THEN AC adapter is plugged into power.

Unplugging the AC adapter from the laptop, while being plugged into power; can cause a Voltage Spike.

You may get away with it for years, and several laptops; and have no problems.

However it only takes ONCE, to fry out the SMD fuses, Multi-Layer Ceramic Capacitors, and Power MOSFET's, on the laptop motherboard's DC to DC circuit.

Jus sayin'.

Moving on........

AC adapter removed, remove the Battery.
Press the Power On button in, and hold in for a count of 10 seconds.
Let go.
Do this procedure 2 more times.

(Draining residual power)

Reinstall the Battery. Attach the AC adapter, plug AC adapter into power. Let the Battery charge 24 hours.
Then turn the laptop on, and tell me what happened.


Mar 15, 2013 | HP Pavilion PC Laptops

1 Answer

AC adapter power connection LED blinks but not charging

This suggests to me that you need to check out the AC adapter, and see if there is an intermittent short. In otherwords a break in the wires.

AC adapter unplugged from laptop, and power, remove the AC power cord from the body of the AC adapter.

Use a multimeter set to OHM's, (1K), and connect the Positive (Red) probe lead to one of the flat bladed prongs, in the power plug that plugs into the surge protector.

Touch the Negative (Black) probe lead to one of the holes in the plug, that goes into the AC adapter 'body'.
Keep going from hole to hole, until you get a reading.
Now have an assistant gently wiggle the power cable, and see if you get an intermittent reading.

Do the same for the other plug's flat bladed prong.
Intermittent reading means replace the power cable, or if more feasible, the entire AC adapter.

Power cable proves to be fine, move on.
Plug the power cable back into the AC adapter. Plug the AC adapter into power.
Using a multimeter set to DC Voltage, touch the Positive (Red) probe lead of the multimeter, to the center hole of the plug that goes into the laptop.
(If just a symbol, the DC Voltage symbol is a dotted line over a solid line)

The Negative (Black) probe lead, touches the outside cylindrical metal shell, of the plug.
Have an assistant gently wiggle the cable, and see if there is an intermittent reading on the multimeter.
(Reading should be 18.5 Volts DC)

[There are Analog multimeters which have a scale, and a needle, and Digital multimeters that just have a digital readout.
If using an Analog multimeter the needle will drop towards 0.
If using a Digital multimeter the readout will drop to smaller numbers, or 0 ]

AC adapter checks out? Go on.

The port on your laptop where the AC adapter plugs in, is the DC Power Jack.
AC adapter unplugged from laptop, Battery removed.
Take a pencil, and gently use the eraser end to see if you can wiggle, the center pin of the DC Power Jack.

ANY perceptible movement means a problem with the DC Power Jack.
The GOOD news is that the DC Power Jack, is NOT soldered directly to the motherboard.

It slides down in a Channel on the outside edge of the Base Enclosure, and has a wiring harness coming from it.
The end of the wiring harness has a plug, that plugs into the motherboard.

The HP part number for this DC Power Harness is HP 600630-001



This is a link to a free Service Manual from HP Support,

Page 73 is for the Power Connector Cable.

No damage to the DC Power Jack, and the harness is not slightly unplugged?
Now you have real problems.

You have a bad Power MOSFET,


B) Power MOSFET:


However it doesn't take a rocket scientist to replace. (Sorry Gort)
These SMD's use a J-lead contact. Simple unsoldering, and soldering.

(Better be fast though as you don't want to overheat a power transistor. Better be good, because you don't want any cold solder joints)

For additional questions please post in a Comment.

Aug 28, 2012 | HP PC Laptops

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

I have ac adapter plugged into the wall, and into the computer, the charge pack light is green, the battery is in the computer and the computer won't turn on at all

You probably have a bad or loose DC jack on the laptop:

Problem symptoms:

  1. Laptop randomly shuts down without any warning.
  2. Power LED and battery charge LED start flickering when you wiggle the power cord or the AC adapter tip on the back or your laptop.
  3. The battery will not get charged.
  4. When you plug AC adapter, the laptop appears to be dead and there is no LED activity at all (DC-IN jack on the system board is broken).

Nov 30, 2010 | Gateway SL1450-30145063 Notebook

3 Answers

Advent N270 netbook will not charge. Orange light comes on initially then goes off. Also when I wiggle the plug into the laptop the light flashes on and intermittently.

It sounds like either a bad connection on the motherboard or a broken wire in the adapter making intermittent connection.

1. With the power adapter disconnected, do you have a power light? This would indicate the adapter is good and the plug is questionable.

2. Check your power adapter output with a multi-meter.(be sure to wiggle the wires around) If the power fluctuates, replace the plug.

3. If the power is solid, replace the motherboard connector.

Nov 22, 2010 | Intel PC Laptops

1 Answer

My laptop is not switching to AC mode even when plugged into Ac Power outlet. I work on battery mode and after full battery drain, the laptop goes into hybernation...once into hybernation it starts...

1. You may possibly have a faulty power supply adapter. Contact the manufacturer and see if there are any call backs on the power adapter for you laptop unit
2. you may also have a damaged connector at the laptop connection. This will require repair by a technician.

Aug 03, 2010 | PC Laptops

2 Answers

Dell 2650 DC wont work

make sure the charger you purchased has the correct voltage out and amperage(in millivolts) as requested by the laptop computer, if not you risk the chance of damaging your laptop. although they fit in the power plug, it does not mean theyre compatible. The specs should be located at the bottom of the laptop or inside the battery bay.

Apr 01, 2010 | PC Laptops

2 Answers

Battery wont change

A problem is just like a mountain. You don't jump over the mountain, you climb it in steps, one step at a time.

1.How old is the battery? 1 to 2 years old, you can expect it to be at the end of it's Life Cycle. Batteries are rated in so many hours of usage.
Best bet is to let the battery charge 24 hours, then try it.

Would be nice if you someone else that has an Inspiron 1525, and they would try to charge your battery. If it doesn't charge up, you would know it's the battery. If it does charge up you can move on down the charging system, to try to find the problem.

2.AC adapter, (Charger) If you have a multimeter, set it to the 50 volt DC scale.
Laptop and desktop computers use DC current. (Direct Current) Your house, for example, uses AC current, (Alternating Current)
AC is converted to DC by the AC adapter, (Charger)

An example of DC current are flashlight batteries, and your laptop battery.
DC current has a Positive pole, and a Negative pole.
The center pin of the plug of your AC adapter is the Positive pole. Any of the four outside pins on the plug, are Negative.
The Red, (Positive), probe of the multimeter goes to the center pin. The Black, (Negative), probe goes to any of the outside four pins on that plug.
Example of a DC Power Jack, for the Dell Inspiron 1500 Series of laptops, 1525 and 1526, (This is the jack inside your laptop, where you plug the AC adapter into),

3.It may be that DC Power Jack itself is bad, or one of the solder connections is cracked. It's hard to see it clearly on the link I provided, (So I Right-clicked on it, Save Image As, and put it right in my My Pictures folder. Then I magnified it), but in the photo you will see some metal pins sticking out of the rectangular body.

The metal pins are sticking up. In reality those pins go down, when the jack is mounted on the motherboard. They go through the motherboard, via holes, and are soldered on the other side.
It is these solder joints that may crack, is what I'm referring to.

Solution to 1?
Obviously buy a new battery.

Solution to 2?
If your multimeter findings show lower voltage than needed, it's time to buy a new AC adapter. They have generic ones that can be used on a variety of laptops. The voltage will be stated on the top of the AC adapter.
Example: 19.2V-1.0A
That's 19.2 Volts at 1 AMP.

It may just be the plug end on the AC adapter itself. The plug end that goes into the DC Power Jack, on your Inspiron laptop.

Solution to 3?
Unless you are a skilled Electronics Technician, and have Excellent de-soldering/soldering skills, I advise taking it to a computer repair shop. It may not just be cracked solder joints. The DC Power Jack may need to be replaced. Maybe the motherboard is one of a bad design, and where the DC Power Jack attaches to it, has cracked.

Jul 25, 2009 | Dell Inspiron 1525 Notebook

1 Answer

My PC won't run with ac /dc power!

Hello. There is a hardware failure with the laptop not the AC charger. AC chargers have some range of protections of their own. If the power requirements of the laptop are bigger then what the charger can handle, the charger will turn off. Also other parameters can bring the charger offline. In your case, you have a problem with a small chip, the battery charge controller unit, witch regulates the amount of current required to propperly charge the battery. When this thing fails, the charging requirements for the battery are reported rong and the AC charger is forced to give more power then necesary. This results in disconnection of the AC charger ( an internal fail safe of the AC charger) and the laptop to swich back to battery power. When the laptop is turned off, it can charge the battery because the power requirements are low, having all processor, main board, hard disk etc turned off. Therefore the AC charger can handle the load. However you will need to have it checked by a service center as it is a hardware fault. Both AC charger and laptop needs that check. The charge controll circuit needs to be replaced probably. It will be a somewhat expensive repair. Don't buy any other battery untill you have the laptop checked. For more aditional info please post back. PS. Sorry for my bad english, I am from Romania, it is pretty hard for me to explain tehnical stuff in english.

Feb 12, 2007 | Sony VAIO FRV28 Notebook

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