Question about Toshiba Satellite A25-S207 Notebook

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My notebook does not turn on with or with out the adapter, how can I know if the AC adapter is bad or is a problem with DC power jack on my computer?

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  • Toshiba Master
  • 12,061 Answers

Hi, this is a very common question. Well as you say you need to first see if you adapter is actually working. Well usually they have some sort of LED showing connection to the AC power, some however do not. If the you do and the LED is light nice and bright, then most likely your power supply is OK, now I say most likely as the Power supply isn't under any "Load" it indeed may fail when "Loaded" or connected up. Once connected if say the LED seemed to dim, there indeed maybe a problem, however most PSU's are "Smart" and they sense any faults, and shut the PSU down, and disconnect from the mains. When the fault is removed, it will resume operation.
An empirical test is obviously to plug it into whatever it's designed to power and if it works, Power led comes on and the device works, it is OK, and that is also flawed as perfectly good looking PSU, simply seems OK, but do NOT work properly and cause the attached device to malfunction. As power supplies can be, sort of, variably faulty from not working at all, to, too high and Too low Voltages, to allowing AC "Hash" and spurious signals through to the device it's connect to and this causes problems and may indeed destroy the attached device. They cause all sorts of problems and are often overlook as a problem source too.
It has been my rule of thumb for many years now that IF I even suspect a supply, I replace it. As if the PSU isn't right, then NOTHING else can be..
As really the only way to guarantee a PSU is with a meter and an oscilloscope, plus the time and proficiency to test it.
Of course, usually simple testing with a volt meter is sufficient, or indeed simply hooking it up to the device.
Now usually if it is the power jack, when you wiggle the cable near the socket, the connection will go off and on. be careful here as often it may be the Plug, you see, the cables on the PSU often break/bad connection at this juncture on the Plug, It breaks commonly, there and where they leave the PSU, and again, mostly in the middle,
Hope that helps.

Posted on Aug 25, 2010

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  • Master
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First of all, you need to make sure your power adapter is providing enough power to both run the laptop & charge the battery. A very good way to do this is to compare your laptop voltage & ampere requirements (written on a sticker on the bottom of the laptop) with the voltage & ampere ratings of the power adapter. Voltages should be the same, or the power adapter's voltage about up to 0.5 volts more than the laptop's voltage rating. Amperage of the power adapter should be at least equal to or greater than the laptop's rating. It should never be less than the laptop's rating, or else the power adapter will be providing insufficient amperes to charge the battery. Of course, the power adapter's nominal amperage might be ok, but it degraded on usage. You can verify this by testing using a good or new power adapter.
If the battery did not charge using the new power adapter, take the battery off the laptop, & using a dry tooth brush, scrub in between the fins of the battery connector on the motherboard & on the battery it self, then put the battery back into the laptop & try again.
If this still did not resolve the problem, then the battery itself could be bad. Try it on another laptop, or try a good or new battery in your laptop.
If this did not work, there might be a possibility that the charging circuitry on the laptop's motherboard is defective & needs servicing. In order to do this, the laptop needs to be disassembled & the motherboard 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

Posted on Aug 25, 2010

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1 Answer

Fault finding


What! !O_O!

For a statement, such as, "Motherboard not on", you would be stating the motherboard either does not receive power, or the motherboard does not use the received power.

Primer:
You press the Power On button. The first chipset to receive power is the BIOS chipset. The Basic Input/Output System program is initialized.

BIOS looks to see what devices are connected, does a Ram Memory count, turns the Processor (CPU) on; and hands the computer over to the Operating System. (In this case a version of Microsoft Windows)

If the statement is the motherboard is not turning on, you are in effect stating the BIOS chipset is Not receiving power.

Diagnoses must start from the AC adapter (Charger) You need to know if the AC adapter is putting out the correct Voltage. Also while testing have an assistant, gently wiggle the cable FROM AC adapter TO laptop; and power cord TO AC adapter. Any fluctuation in the reading, means a broken wire.

AC adapter proves to be good, the diagnoses goes to the DC Power Jack. The DC Power Jack is the jack on the laptop, that the AC adapter plugs into. (DC_IN)

AC adapter removed, Battery removed; a small instrument is used to see if you can gently move the DC Power Jack. ANY perceptible movement means a bad DC Power Jack -> Replace.

DC Power Jack checks out OK, then the problem will most likely be the Power MOSFET's on the motherboard. They determine if the Battery is to receive a trickle charge, or full charge. Also determines if the laptop is to run off of the Battery, or just the AC adapter.

Using the HP Pavilion dv6000 series, and Pavilion dv9000 series of Notebook PC's; as an example,

http://mayohardware.blogspot.com/2010/04/important-parts-on-dv6000-and-dv9000.html

I can give a lot more, than the generic information above, if I had the Model Number of the Acer laptop. This is on the Bottom of the laptop. Post back in a Comment.

Regards,
joecoolvette

Apr 23, 2013 | Acer Computers & Internet

1 Answer

Samsung n145 will not power up


Related to a Samsung Np-n145 Notebook PC:

Plug the laptop into power for 24 hours. See if the Battery charges up.

Next test, or have tested, the AC adapter (Charger) See if it is putting out 19 Volts -> DC.
Know someone with a multimeter? I can guide you in testing.

AC adapter is good? Things go downhill rapidly here.
The next problem could be a DC Power Jack.

The DC Power jack is the jack on the laptop, that you plug the AC adapter into,

1) The DC Power jack may be broken
2) The solder joints holding it to the motherboard may be cracked. Poor connection to motherboard.

The DC Power jack can be replaced, or it's solder joints re-soldered.

DC Power jack proves to be okay?

Power MOSFET's have gone bad. The next link, is an article that deals with bad Power MOSFET's in an HP laptop. Used for an example,

http://mayohardware.blogspot.com/2010/04/important-parts-on-dv6000-and-dv9000.html

Let's hope it's a bad AC adapter

Regards,
joecoolvette

Jul 18, 2012 | Samsung Notebook Np-n145 10.1" Laptop...

1 Answer

Which ac do when a laptop compaq nc6400 is verr slow and doesnt charge the battery


What does the AC do? (Alternating Current)

Apparently not get rectified into DC electricity by the AC adapter, (Charger), or the rectified AC (Which is now DC), is not getting to the laptop.

Be sure the Battery is still good. They have a lifespan, and only last so long.

Verify, by performing a DC Voltage test with a multimeter, if the AC adapter is putting out the correct Voltage.

If it is an AC adapter for an HP Compaq NC6400 Notebook PC, the DC Voltage coming out of the AC adapter is supposed to be
18.5 Volts. (DC),

http://www.amazon.com/Notebook-Adapter-Presario-cq50-142us-cq50-110/dp/B001MQ4MNW

On the AC adapter plug going to the laptop, the center pin is the Positive connection.
The outer cylindrical metal shell is the Negative connection.

AC adapter puts out 18.5 Volts?
Have an assistant;

1) Gently wiggle the power cord coming TO the AC adapter.

2) Gently wiggle the cable coming FROM the AC adapter TO the laptop.

See if you get an intermittent reading on the multimeter. Indicates a broken wire.

[ An economical, but fine for this test, multimeter, can be purchased for as little as $8 to $12, here in the US.
Analog or digital is fine.
Available in a multitude of stores. An auto parts store is but one example ]

AC adapter checks out it's on to the DC Power Jack.
This jack is the round port on the laptop, that the plug from the AC adapter plugs into.

Battery removed use a wooden small object, and gently see if you can move the center pin around, for the DC Power Jack.

See if the rest of the DC Power Jack will move around.
ANY perceptible movement means a problem with the DC Power Jack.

The DC Power Jack looks like this not mounted to the motherboard,

http://www.batterystyle.com/compaq-nc6400-jack-p-436629.html

Click on the two views shown of the DC Power Jack.
The view on the left shows the jack from the back.
The view on the right shows the jack from the front. The view you see now.

Note that in both views the jack is shown upside down, in relation to how it actually sits on the motherboard.

The view on the left, (Back view), shows Prongs coming from the jack, that go down through the motherboard, and are then soldered.

The gold colored prong is the Positive prong. It goes to the Center Pin of the jack.
All of the silvery colored Prongs are for Ground, or Negative.

Where the Prongs are soldered to the motherboard, are called solder joints. Each prong has a solder joint.

It may just be that one, or more solder joints are cracked.
This would require disassembling the laptop down to the bare motherboard in your hand, then re -soldering any cracked solder joints.

[ Be SURE to use an ESD wrist strap, and have it's alligator clip connected to a good ground source, BEFORE working inside a laptop ]

It may be however that the DC Power Jack is damaged, and replacement is necessary.

HP Support > HP Compaq NC6400 Notebook PC > Manuals page,

http://h20000.www2.hp.com/bizsupport/TechSupport/DocumentIndex.jsp?contentType=SupportManual&lang=en&cc=us&docIndexId=64179&taskId=101&prodTypeId=321957&prodSeriesId=1847703

On this page click on - Service and maintenance information

(Under the - Quick jump to manuals by category - heading)

Under the bold - Service and maintenance information - heading, click on -
HP Compaq NC6400 Notebook PC Maintenance and Service Guide
(24 Apr 2007 / 4.61MB )

[ 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 ]

Need guidance in de-soldering, and removing the old DC Power Jack, and soldering in a new one?
Post in a Comment.

If the DC Power Jack checks out, you have a bad power correcting chipset. This is a type of Power MOSFET.
Motherboard replacement is the solution.

Regards,
joecoolvette

Apr 25, 2012 | HP Compaq nc6400 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).


http://www.insidemylaptop.com/laptop-dc-power-jack-repair-techniques/

Nov 30, 2010 | Gateway SL1450-30145063 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.

http://www.laptopjacks.com/view_part/For-Gateway-MX6920-DC-Power-Jack-GW51425.html

[ 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)

OR,
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.
(Ka-Ching)

Oct 21, 2010 | Gateway MX6920 Notebook

1 Answer

Notebook won't power on


Take the battery off and try to turn it on with just the power cord. If it works then it's your battery. If it doesn't then it's either your ac adapter or your dc jack. Try an ac adapter from a local pc shop or electronics shop. AC adapters run around 40 dollars or less if you order them online. DC jacks are a different story. I the jack needs to be replaced you'll have to take it to a pc shop or if you can do it yourself then order a dc jack online or purchase it online and take the computer apart replace the dc jack (you'll have to desolder the old one and solder the new one one). Good luck!

Aug 23, 2010 | HP Compaq nx8220 Notebook

1 Answer

Pluged aspire 4520 in at night. next morning, no lights no power. nothing


if the unit will power one with ac adapter plugged in then you have a bad battery. check to see if you dc jack on the lap top lights up when you plug in the AC. if it does not light up then your dc jack or ac adapter is bad.

Jan 27, 2010 | Acer Aspire 4520-5582 Notebook

1 Answer

Would any 16volt ac adapter be ok to charge my PCG-VX89 vaio notebook?


you can use any laptop AC adapter DC output-16V and 4A (current). if its jack size natch your laptop DC jack.
if the adapter DC current less than 4A (over 2.5A at least) you should only make the battery charging without laptop turn on!!!
please take a rating let me know how much helped you thanks!

May 21, 2009 | Sony VAIO V505DC PC Notebook

1 Answer

No ac power but plugged in


If you plugged in the ac adapter, and you still get no power and cannot turn it on, the first thing to check is the AC adapter. Get a voltage meter, set it to 200 DC, put the positive on the inside and the ground on the outside. Unless you have a highpower alienware laptop, it should read +/- 20 V, most likely 19.xx. If your AC adapter is good, then the DC jack, what the adapter plugs into, is bad. In this case, the laptop will have to be disassembled, the mother boared removed, the old DC jack de-soldered and taken off, and a new DC jack soldered on. You would really need to take it to a qualified techninician at a shop to di it.

Mar 21, 2009 | Acer Aspire 5100-5022 Notebook

1 Answer

Cx2620 gateway wont turn on


Possibly Need a New DC Jack In Your Laptop... the DC JAck Is The Port Where Your AC Adapter Plugs Into...

Though You SHould as well Check For Proper Power To Your CHarger Cord.. Not all AC Cords That Have Their Lights On Are Able To Charge...

To CHeck If It's The DC Jack... Remove Your Battery..... Plug In the AC Adapter Cord... Power On... If You Get No Lights/ No Power/ No Fans Etc..... It's Your DC Jack

Nov 20, 2008 | Gateway Convertible CX2620 Notebook

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